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EP0035922B1 - Tuning device with variable capacity and tunable microwave filter with at least one such device - Google Patents

Tuning device with variable capacity and tunable microwave filter with at least one such device Download PDF

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Publication number
EP0035922B1
EP0035922B1 EP81400240A EP81400240A EP0035922B1 EP 0035922 B1 EP0035922 B1 EP 0035922B1 EP 81400240 A EP81400240 A EP 81400240A EP 81400240 A EP81400240 A EP 81400240A EP 0035922 B1 EP0035922 B1 EP 0035922B1
Authority
EP
European Patent Office
Prior art keywords
finger
plunger
tuning device
hollow
tuning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81400240A
Other languages
German (de)
French (fr)
Other versions
EP0035922A1 (en
Inventor
Jea-Claude Curtinot
Xavier Delestre
Jean Fouillet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0035922A1 publication Critical patent/EP0035922A1/en
Application granted granted Critical
Publication of EP0035922B1 publication Critical patent/EP0035922B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/219—Evanescent mode filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • the invention relates to the field of frequency tunable microwave filters and more particularly to a variable capacity tuning device for such filters.
  • the transmission systems and in particular the telecommunication systems are designed to operate in a given frequency band, possibly comprising several channels and the system's microwave filters must be tuned to the desired channel.
  • the filters can be adjusted at the factory or when they are permanently installed; when the system is intended to operate successively on several frequency channels, the filters, then called “frequency agile", must be able to pass quickly and simply from one channel to another.
  • it is necessary to provide means for tuning the microwave filters used and this tuning will be easier if the number of elements to be varied will be small and their adjustment will have little influence on the characteristics. of the filter other than the tuning frequency.
  • the microwave filters commonly used are of several types: there are filters whose resonator elements are line sections, others for which these elements are in waveguide.
  • the most commonly used TEM inline resonator filters are the quarter wave resonator filters and the peigen resonator filters charged by localized capacitive elements forming obstacles.
  • Waveguide resonator filters are distinguished by their operating mode: when they work in propagation mode, that is to say above the guide's own cut-off frequency, the the most used type is the half-wave resonator filter of the series type coupled by inductive susceptance; when they work in evanescent mode, that is to say at a frequency lower than the natural cut-off frequency of the guide, their structure is of the type with parallel resonators coupled by admittance inverters and they then comprise capacitive obstacles located.
  • the agreement of the filters is obtained by varying the shape of the localized inductive or capacitive obstacles associated with the TEM lines or the waveguides to form the filter.
  • the invention relates specifically to capacitive type obstacles and more particularly relates to a capacitive tuning device, usable in all filters comprising localized capacitive obstacles.
  • the capacitive tuning devices currently used are most often made using metal plungers penetrating into the guide or the line, and the adjustment of the capacity is obtained by varying the depression of this plunger; the variation of the susceptance of the capacitive element (linked to the variation of the tuning frequency) thus obtained, as a function of the frequency, depends on the physical configuration of this element and on the section of the guide or of the line; but generally the law of variation of the tuning frequency, as a function of the displacement of the plunger is not at all linear.
  • the dimensions of the guide in the plane orthogonal to the axis of propagation are less than the wavelength corresponding to the natural cut-off frequency of the guide; consequently the localized capacity necessary to obtain the agreement, which is all the greater the lower the working frequency, must be housed in a smaller space.
  • the increase in the value of the capacity achieved by means of two opposite plungers is obtained by decreasing the interval separating them. Beyond a certain limit, this interval is too small to be adjusted with precision, all the more since the variations in temperature can, by the expansion of the metals which they entail, create very significant relative variations in this interval .
  • variable capacity tuning devices comprising two coaxial fingers, one hollow, and the other comprising a movable plunger inside the hollow finger, make it possible to perform a capacity variation.
  • Different embodiments of such tuning devices have been described for example in French patents 1,046,593 or 880,808, in English patent 1,163,896, in American patent 3,273,083 or in German patent application 2,412 759. These devices always have only a variable component of the capacity determining the tuning frequency, its variation being determined by the greater or lesser penetration of the plunger.
  • the subject of the invention is a tuning device with double capacity component, which makes it possible to produce such filters.
  • a tuning device with variable capacity for tunable microwave filter, comprising two coaxial fingers movable relative to each other, a first finger being hollow and the second comprising a plunger capable of penetrating into the part hollow of the first finger and movable relative to it between a minimum insertion position where the plunger and the hollow finger have no facing side surfaces and a maximum insertion position where the plunger and the hollow finger have maximum opposite side surfaces, to determine a first component of the variable capacity, is characterized in that the second finger has in addition to a cylindrical end of the same outside diameter as a cylindrical end of the first finger, these two ends being intended to face each other by their flat surfaces and being movable relative to each other, the variable distance between the flat surfaces in look at the cylindrical ends determining a second component of the variable capacity.
  • the invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity.
  • FIGS 1, 2, 3 and 4 show, in section different embodiments of the variable capacity tuning device according to the invention, particularly intended for fixed frequency filters.
  • FIG. 5 represents an embodiment of the tuning device according to the invention, particularly intended for so-called “frequency agile” filters.
  • FIG. 1 represents the simplest embodiment of the tuning device according to the invention.
  • This device is shown in section, in place in a guide 1, 1 '.
  • This guide can be a wave guide in evanescent mode with a square, rectangular, round or even ellipsoidal section.
  • 1-1 ' can also represent the walls of a TEM line.
  • the capacitive device mainly comprises a metal finger, fixed in the wall 1 ′ is a threaded movable finger, 20, the wall 1 being tapped.
  • a nut 21 allows the movable finger 20 to be held in place.
  • the fixed finger 10 and the movable finger 20 are interpenetrating, their ends having complementary shapes, the end of the finger 20 forming a tuning plunger in a corresponding cavity formed in the finger. 10.
  • the minimum facing surfaces are chosen so that, when the end of the movable finger 20 forming a plunger is at the minimum insertion e min corresponding to the minimum capacity C min , this capacity C min or the tuning capacity for the highest frequency of the range, F max .
  • This capacity essentially depends on the distance d between the planar surfaces opposite the ends of the two fingers 10 and 20 for this minimum penetration e min and the surfaces of opposite fingers.
  • the stroke of the end of the movable finger forming a plunger 20 and the corresponding height of the cavity formed in the fixed finger 10, as well as their respective diameters, are chosen so that the maximum capacity C max corresponds to the minimum frequency F min of the desired frequency range of tuning, the facing surfaces of the two fingers being then maximum.
  • the minimum depression e min corresponding to the frequency F max has been assumed to correspond to the position of the two fingers such that the end of the plunger is in the same plane as the flat surface of the end of the finger 10 But this minimum sinker plunge corresponding to the frequency F max could be greater. This setting is related to the highest frequency of the tuning band.
  • the external shape of the tuning device thus produced varies a little and that the capacity produced evolves as a whole with the depression of the plunger, the component of capacity due to the plunger and the component of capacity due to the flat surfaces opposite the tips of the fingers varying at the same time.
  • a movable finger comprising a movable body allowing tuning at the high frequency of the tuning range and a small central plunger, also movable, introducing a variable additional capacity which is added to the minimum capacity C min corresponding to the minimum insertion of the small plunger but which does not modify the external shape of the tuning device.
  • the tuning device shown in FIG. 2 comprises a hollow fixed finger 10 and a movable finger 20 comprising a corpos, 22, movable in the wall 1, the movable body being held in position by a nut 21.
  • This body 22 penetrates slightly in the cavity of the fixed finger 10.
  • this hollow movable body is associated a small movable plunger 23 screwed into the body 22, the depression of which is likely to vary between a minimum depression and e min , the end of the small movable plunger then being flush at the end of the movable body 22 and the capacity thus produced being a capacity C min corresponding to the highest frequency of the tuning range F max , and a maximum depression e max ' the small plunger then coming into abutment at l inside the body 22 and the capacity thus produced being the maximum capacity C max corresponding to the minimum frequency of the tuning range.
  • Displacement of the small plunger can be in the range of 5 mm to 1 cm to cover the tuning range; the distance d between the flat surfaces of the two opposite fingers for the minimum insertion of the plunger, of the order of 5 tenths of a millimeter, is definitively adjusted for the highest frequency of the range, and only the small plunger is moved to get the variations of the tuning frequency.
  • the end of the finger 10, with its cavity, and the end of the finger 20, with the flat surface of the cylindrical end of the body 22 and the plunger 23, have roughly complementary shapes.
  • the variation in capacitance obtained is such that the tuning frequency varies almost linearly with depression.
  • the small plunger 23 is fixed in position by means of a nut 24 while resting on the head of the movable body 22.
  • FIG. 3 represents an analogous embodiment but for which the outside diameter of the fingers is large relative to the diameter of the cylindrical ends whose opposite planar faces achieve the minimum capacity and relative to the diameter of the plunger which determines the additional variable capacity which is added to it.
  • the fixed finger 10 and the body 22 of the movable finger 20 have their ends thinned so that the planar surfaces facing the ends of the fingers, which achieve the minimum capacity C min, are fairly small.
  • the mobile body 22 does not enter the cavity of the fixed finger 10.
  • the hollow of the fixed finger 10 and the hollow of the body 22 of the mobile finger have the same diameter, adapted to the diameter of the small mobile plunger 23, the ends of the finger fixed and the end of the body of the movable finger therefore have the same shape.
  • the minimum capacity C min is adjusted when the plunger 23 is placed in the high position at the minimum insertion e min and as in the embodiment of FIG. 2, the variation in capacity generated by the displacement of the plunger is such that the variation tuning frequency is linear as a function of the displacement of the plunger.
  • the respective diameters of the hollow of the finger 10 and of the plunger are such that the displacement of the plunger makes it possible to cover the desired frequency range.
  • Such an embodiment of the capacitive tuning device has made it possible to cover the range of tuning frequencies 1.7 GHz to 2.1 GHz in a filter in evanescent mode, that is to say relatively high frequencies, the initial capacity for the 2.1 GHz frequency being relatively low.
  • the embodiment represented in FIG. 4 makes it possible to cover a relatively lower frequency range, the capacitance C min produced for the highest frequency in the range being higher than in the embodiment of FIG. 3.
  • the hollow body 22 has its end cut so as to enter a hollow of corresponding diameter provided in the hollow fixed finger 10.
  • the ends of the body 22 of the movable finger and the end of the fixed finger therefore have complementary shapes.
  • the flat surfaces and the cylindrical surfaces opposite the fixed finger 10 and the body 22 of the movable finger 20 make it possible to achieve this capacity C min for the highest frequency in the range.
  • the body 22 is then fixed by means of the nut 21.
  • the external shape presented by the variable capacity tuning device in the guide does not vary in the tuning frequency range. The variation in additional capacity is obtained, as in the embodiments of FIGS.
  • the tuning frequency varies linearly with the sinking of the tuning plunger.
  • FIG. 5 represents an embodiment of a variable capacity tuning device particularly intended for so-called "frequency agile" filters, that is to say capable of passing rapidly from one tuning frequency to another within a determined range.
  • the fixed finger 10, the body 22 of the movable finger 20 and the nut 21 which is linked to it are the same as those of the embodiment of FIG. 2, except that the interior of the body 22 is smooth and not threaded.
  • the mobile plunger 25 has the shape of a smooth piston capable of sliding in the hollow body 22.
  • the electrical contact between the piston 25 and the body of the microwave filter is obtained by means of the body 22 by means of a end piece 26 forming clamps and extending the intermediate part of the piston 25.
  • variable capacity tuning device is invariable regardless of the tuning frequency. Consequently, throughout the tuning frequency range, the coupling of the resonator to the neighboring resonator or to the ports of the filter does not vary as a function of the tuning frequency. Similarly, the bandwidth is almost independent of the tuning frequency.
  • variable capacity tuning device leads to filters that are very easy to compensate for in temperature.
  • the variation of the tuning frequency being a linear function of the depression of the tuning plunger, and the elongations of the various mechanical elements constituting the capacitive elements also following linear laws, the materials and the dimensions of the elements relative to each other can be chosen in a fairly simple manner so that the temperature filter compensation can be achieved throughout the entire tuning range.
  • the overvoltage coefficient remains high throughout the frequency range of the filter.
  • the small plunger has a small diameter compared to the outer diameter of the two fingers, the stroke of the plunger is large compared to the previous embodiments and the adjustment of the filter is greatly facilitated. The resolution is also greatly improved.
  • the invention is not limited to the embodiments described and shown.
  • the external shapes of the fixed finger and of the movable finger are not limited to the shapes described by way of nonlimiting example with reference to FIGS. 1, 2, 3 and 4 (FIG. 5 repeating in this the shape shown in Figure 2).
  • the shapes are determined from the minimum capacity to be produced, in particular in conjunction with the diameter of the fingers and the dimensions of the guides in which the tuning devices are placed to produce the filters.
  • the fixed finger has been, in all the embodiments described, chosen as being the hollow finger, the movable finger in the body of the filter being of finger comprising the tuning plunger. It is of course possible to do the opposite, the finger movable relative to the body of the filter then being the hollow finger and the fixed finger then being the finger comprising the chord plunger, the chord plunger then being movable in a finger fixed.
  • the invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity, this filter can be a filter of the waveguide type in evanescent mode or a filter of the TEM line type comprising Localized capacitive elements.

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Description

L'invention se rapporte au domaine des filtres hyperfréquences accordables en fréquence et plus particulièrement à un dispositif d'accord à capacité variable pour de tels filtres.The invention relates to the field of frequency tunable microwave filters and more particularly to a variable capacity tuning device for such filters.

D'une manière générale, les systèmes de transmission et particulièrement les systèmes de télécommunucations sont conçus pour fonctionner dans une bande de fréquence donnée, comportant éventuellement plusieurs canaux et les filtres hyperfréquences du système doivent être accordés sur le canal désiré. Lorsque le système est destiné à fonctionner sur un canal de fréquences fixe, les filtres peuvent être réglés en usine ou lors de leur installation de manière définitive; lorsque le système est destiné à fonctionner successivement sur plusieurs canaux de fréquences, les filtres, dits alors "agiles en fréquence", doivent pouvoir passer rapidement et simplement d'un canal à l'autre. Dans tous les cas, il est nécessaire de prévoir des moyens d'accord des filtres hyperfréquences utilisés, et cet accord sera d'autant plus facile à réaliser que le nombre d'éléments à faire varier sera petit et que leur réglage influencera peu les caractéristiques du filtre autres que la fréquence d'accord.In general, the transmission systems and in particular the telecommunication systems are designed to operate in a given frequency band, possibly comprising several channels and the system's microwave filters must be tuned to the desired channel. When the system is intended to operate on a fixed frequency channel, the filters can be adjusted at the factory or when they are permanently installed; when the system is intended to operate successively on several frequency channels, the filters, then called "frequency agile", must be able to pass quickly and simply from one channel to another. In all cases, it is necessary to provide means for tuning the microwave filters used, and this tuning will be easier if the number of elements to be varied will be small and their adjustment will have little influence on the characteristics. of the filter other than the tuning frequency.

Les filtres hyperfréquences couramment utilisés sont de plusieurs types: il existe des filtres dont les éléments résonateurs sont des tronçons de ligne, d'autres pour lesquels ces éléments sont en guide d'onde. Les filtres à résonateurs en ligne TEM les plus couramment utilisés sont les filtres intergidités à résonateurs quart d'onde et les filtres en peigen à résonateurs chargés par des éléments capacitifs localisés formant obstacles. Les filtres à résonateurs en guide d'onde quant à eux se distinguent d'après leur mode de fonctionnement: lorsqu'ils travaillent en mode de propagation c'est-à-dire au- dessus de la fréquence de coupure propre du guide, le type le plus utilisé est le filtre à résonateur demi-onde du type série couplé par susceptance selfique; lorsqu'ils travaillent en mode évanescent, c'est-à-dire à une fréquence inférieure à la fréquence de coupure propre du guide, leur structure est du type à résonateurs parallèles couplés par des inverseurs d'admittance et ils comportent alors des obstacles capacitifs localisés.The microwave filters commonly used are of several types: there are filters whose resonator elements are line sections, others for which these elements are in waveguide. The most commonly used TEM inline resonator filters are the quarter wave resonator filters and the peigen resonator filters charged by localized capacitive elements forming obstacles. Waveguide resonator filters are distinguished by their operating mode: when they work in propagation mode, that is to say above the guide's own cut-off frequency, the the most used type is the half-wave resonator filter of the series type coupled by inductive susceptance; when they work in evanescent mode, that is to say at a frequency lower than the natural cut-off frequency of the guide, their structure is of the type with parallel resonators coupled by admittance inverters and they then comprise capacitive obstacles located.

L'accord des filtres est obtenu en faisant varier la forme des obstacles inductifs ou capacitifs localisés associés aux lignes TEM ou aux guides d'onde pour former le filtre.The agreement of the filters is obtained by varying the shape of the localized inductive or capacitive obstacles associated with the TEM lines or the waveguides to form the filter.

L'invention se rapporte précisément aux obstacles de type capacitif et a plus particulièrement pour objet un dispositif d'accord capacitif, utilisable dans tous les filtres comportant des obstacles capacitifs localisés.The invention relates specifically to capacitive type obstacles and more particularly relates to a capacitive tuning device, usable in all filters comprising localized capacitive obstacles.

Les dispositifs d'accord capacitifs utilisés actuellement sont le plus souvent réalisés à l'aide de plongeurs métalliques pénétrant dans le guide ou la ligne, et le réglage de la capacité est obtenu en faisant varier l'enfoncement de ce plongeur; la variation de la susceptance de l'élément capacitif (liée à la variation de la fréquence d'accord) ainsi obtenue, en fonction de la fréquence, dépend de la configuration physique de cet élément et de la section du guide ou de la ligne; mais d'une manière générale la loi de variation de la fréquence d'accord, en fonction du déplacement du plongeur n'est pas du tout linéaire. De plus, dans les filtres en mode évanescent, les dimensions du guide dans le plan orthogonal à l'axe de propagation sont inférieures à la longueur d'onde correspondant à la fréquence de coupure propre du guide; par conséquent la capacité localisée nécessaire pour obtenir l'accord, qui est d'autant plus grande que la fréquence de travail est basse, doit être logée dans un espace plus petit. L'augmentation de la valeur de la capacité réalisée au moyen de deux plongeurs se faisant face est obtenue en diminuant l'intervalle les séparant. Au-delà d'une certaine limite, cet intervalle est trop petit pour être ajusté avec précision, d'autant plus que les variations de température peuvent, par la dilatation des métaux qu'elles entraînent, créer des variations relatives très importantes de cet intervalle. D'autres types de dispositifs d'accord à capacité variable comportant deux doigts coaxiaux, l'un creux, et l'autre comportant un plongeur déplaçable à l'intérieur du doigt creux permettent de réaliser une variation de capacité. Différents modes de réalisation de tels dispositifs d'accord ont été décrits par exemple dans les brevets français 1 046 593 ou 880 808, dans le brevet anglais 1 163 896, dans le brevet américain 3 273 083 ou dans la demande de brevet allemand 2 412 759. Ces dispositifs ne comportent toujours qu'une composante variable de la capacité déterminant la fréquence d'accord, sa variation étant déterminée par l'enfoncement plus ou moins grand du plongeur.The capacitive tuning devices currently used are most often made using metal plungers penetrating into the guide or the line, and the adjustment of the capacity is obtained by varying the depression of this plunger; the variation of the susceptance of the capacitive element (linked to the variation of the tuning frequency) thus obtained, as a function of the frequency, depends on the physical configuration of this element and on the section of the guide or of the line; but generally the law of variation of the tuning frequency, as a function of the displacement of the plunger is not at all linear. In addition, in the filters in evanescent mode, the dimensions of the guide in the plane orthogonal to the axis of propagation are less than the wavelength corresponding to the natural cut-off frequency of the guide; consequently the localized capacity necessary to obtain the agreement, which is all the greater the lower the working frequency, must be housed in a smaller space. The increase in the value of the capacity achieved by means of two opposite plungers is obtained by decreasing the interval separating them. Beyond a certain limit, this interval is too small to be adjusted with precision, all the more since the variations in temperature can, by the expansion of the metals which they entail, create very significant relative variations in this interval . Other types of variable capacity tuning devices comprising two coaxial fingers, one hollow, and the other comprising a movable plunger inside the hollow finger, make it possible to perform a capacity variation. Different embodiments of such tuning devices have been described for example in French patents 1,046,593 or 880,808, in English patent 1,163,896, in American patent 3,273,083 or in German patent application 2,412 759. These devices always have only a variable component of the capacity determining the tuning frequency, its variation being determined by the greater or lesser penetration of the plunger.

Mais les gammes de variations de fréquences d'accord de ce type de dispositifs ne permettent pas de réaliser des filtres accordables dans une large bande en conservant des caractéristiques convenables.However, the ranges of variations in tuning frequencies of this type of device do not allow tunable filters to be produced in a wide band while retaining suitable characteristics.

L'invention a pour objet un dispositif d'accord à double composante de capacité, qui permet de réaliser de tels filtres.The subject of the invention is a tuning device with double capacity component, which makes it possible to produce such filters.

Suivant l'invention un dispositif d'accord à capacité variable, pour filtre hyperfréquence accordable, comportant deux doigts coaxiaux déplaçables l'unes par rapport à l'autre, un premier doigt étant creux et le second comportant un plongeur susceptible de pénétrer dans la partie creuse du premier doigt et déplaçable par rapport à celui-ci entre une position d'enfoncement minimal où le plongeur et le doigt creux n'ont pas de surfaces latérales en regard et une position d'enfoncement maximal où le plongeur et le doigt creux ont des surfaces latérales en regard maximales, pour déterminer une première composante de la capacité variable, est caractérisé en ce que le second doigt présente en outre une extrémité cylindrique de même diamètre extérieur qu'une extrémité cylindrique du premier doigt ces deux extrémités étant destinées à se faire face par leurs surfaces planes et étant déplaçables l'une par rapport à l'autre, la distance variable entre les surfaces planes en regard des extrémités cylindriques déterminant une seconde composante de la capacité variable.According to the invention a tuning device with variable capacity, for tunable microwave filter, comprising two coaxial fingers movable relative to each other, a first finger being hollow and the second comprising a plunger capable of penetrating into the part hollow of the first finger and movable relative to it between a minimum insertion position where the plunger and the hollow finger have no facing side surfaces and a maximum insertion position where the plunger and the hollow finger have maximum opposite side surfaces, to determine a first component of the variable capacity, is characterized in that the second finger has in addition to a cylindrical end of the same outside diameter as a cylindrical end of the first finger, these two ends being intended to face each other by their flat surfaces and being movable relative to each other, the variable distance between the flat surfaces in look at the cylindrical ends determining a second component of the variable capacity.

L'invention a également pour objet un filtre hyperfréquence accordable comportant au moins un tel dispositif d'accord à capacité variable.The invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity.

L'invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description qui suit en référence aux figures annexées.The invention will be better understood and other characteristics will appear from the following description with reference to the appended figures.

Les figures 1, 2, 3 et 4 représentent, en section différents modes de réalisation du dispositif d'accord à capacité variable selon l'invention, particulièrement destinés aux filtres à fréquence fixe.Figures 1, 2, 3 and 4 show, in section different embodiments of the variable capacity tuning device according to the invention, particularly intended for fixed frequency filters.

La figure 5 représente un mode de réalisation du dispositif d'accord selon l'invention, particulièrement destiné aux filtres dits "agiles" en fréquence.FIG. 5 represents an embodiment of the tuning device according to the invention, particularly intended for so-called "frequency agile" filters.

Sur toutes les figures, les éléments analogues ont été désignés par les mêmes repères.In all the figures, similar elements have been designated by the same references.

La figure 1 représente le mode de réalisation le plus simple du dispositif d'accord selon l'invention. Ce dispositif est représenté en coupe, en place dans un guide 1, 1'. Ce guide peut être un guide d'onde en mode évanescent de section carrée, rectangulaire, ronde ou même ellipsoïdale. 1-1' peut également représenter les parois d'une ligne TEM. Le dispositif capacitif comporte principalement un doigt métallique, 10 fixe dans la paroi 1' est un doigt mobile fileté, 20, la paroi 1 étant taraudée. Un écrou 21 permet de maintenir en place le doigt mobile 20. Le doigt fixe 10 et le doigt mobile 20 sont interpénétrants leurs extrémités ayant des formes complémentaires, l'extrémité du doigt 20 formant plongeur d'accord dans une cavité correspondante formée dans le doigt 10. Pour obtenir l'accord dans une gamme de fréquences donnée, Fmin (fréquence minimum de la gamme) à Fax (fréquence maximum de la gamme), les surfaces en regard minimales sont choisies pour que, lorsque l'extrémité du doigt mobile 20 formant plongeur est à l'enfoncement minimal emin correspondant à la capacité minimale Cmin, cette capacité Cmin soit la capacité d'accord pour la fréquence la plus haute de la gamme, Fmax. Cette capacité dépend essentiellement de la distance d entre les surfaces planes en regard des extrémités des deux doigts 10 et 20 pour cet enfoncement minimal emin et des surfaces de doigts en regard. La course de l'extrémité du doigt mobile formant plongeur 20 et la hauteur correspondante de la cavité formée dans le doigt fixe 10, ainsi que leurs diamètres respectifs, sont choisis pour que la capacité maximale Cmax corresponde à la fréquence minimale Fmin de la gamme de fréquences d'accord souhaitée, les surfaces en regard es deux doigts étant alors maximales. Sur la figure 1, l'enfoncement minimal emin correspondant à la fréquence Fmax a été supposé correspondre à la position des deux doigts telle que l'extrémité du plongeur soit dans le même plan que la surface plane de l'extrémité du doigt 10. Mais cet enfoncement minimal de plongeur correspondant à la fréquence Fmax pourrait être plus grand. Ce réglage est lié à la fréquence la plus haute de la bande d'accord.FIG. 1 represents the simplest embodiment of the tuning device according to the invention. This device is shown in section, in place in a guide 1, 1 '. This guide can be a wave guide in evanescent mode with a square, rectangular, round or even ellipsoidal section. 1-1 'can also represent the walls of a TEM line. The capacitive device mainly comprises a metal finger, fixed in the wall 1 ′ is a threaded movable finger, 20, the wall 1 being tapped. A nut 21 allows the movable finger 20 to be held in place. The fixed finger 10 and the movable finger 20 are interpenetrating, their ends having complementary shapes, the end of the finger 20 forming a tuning plunger in a corresponding cavity formed in the finger. 10. To obtain agreement in a given frequency range, F min (minimum frequency of the range) to Fax (maximum frequency of the range), the minimum facing surfaces are chosen so that, when the end of the movable finger 20 forming a plunger is at the minimum insertion e min corresponding to the minimum capacity C min , this capacity C min or the tuning capacity for the highest frequency of the range, F max . This capacity essentially depends on the distance d between the planar surfaces opposite the ends of the two fingers 10 and 20 for this minimum penetration e min and the surfaces of opposite fingers. The stroke of the end of the movable finger forming a plunger 20 and the corresponding height of the cavity formed in the fixed finger 10, as well as their respective diameters, are chosen so that the maximum capacity C max corresponds to the minimum frequency F min of the desired frequency range of tuning, the facing surfaces of the two fingers being then maximum. In FIG. 1, the minimum depression e min corresponding to the frequency F max has been assumed to correspond to the position of the two fingers such that the end of the plunger is in the same plane as the flat surface of the end of the finger 10 But this minimum sinker plunge corresponding to the frequency F max could be greater. This setting is related to the highest frequency of the tuning band.

Dans ce mode de réalisation, il faut noter que la forme extérieure du dispositif d'accord ainsi réalisé varie un peu et que la capacité réalisée évolue dans son ensemble avc l'enfoncement du plongeur, la composante de capacité due au plongeur et la composante de capacité due aux surfaces planes en regard des extrémités des doigts variant en même temps.In this embodiment, it should be noted that the external shape of the tuning device thus produced varies a little and that the capacity produced evolves as a whole with the depression of the plunger, the component of capacity due to the plunger and the component of capacity due to the flat surfaces opposite the tips of the fingers varying at the same time.

Les modes de réalisation représentés sur les figures suivantes sont perfectionnés: ils comportent un doigt mobile comportant un corps mobile permettant l'accord à la fréquence haute de la gamme d'accord et un petit plongeur central, également mobile, introduisant une capacité supplémentaire variable qui s'ajoute à la capacité minimale Cmin correspondant à l'enfoncement minimal du petit plongeur mais qui ne modifie pas la forme extérieure du dispositif d'accord.The embodiments shown in the following figures are improved: they include a movable finger comprising a movable body allowing tuning at the high frequency of the tuning range and a small central plunger, also movable, introducing a variable additional capacity which is added to the minimum capacity C min corresponding to the minimum insertion of the small plunger but which does not modify the external shape of the tuning device.

Le dispositif d'accord représenté sur la figure 2 comporte un doigt fixe creux 10 et un doigt mobile 20 comportant un corpos, 22, mobile dans la paroi 1, le corps mobile étant maintenu en position par un écrou 21. Ce corps 22 pénètre légèrement dans la cavité du doigt fixe 10. A ce corps mobile creux est associé un petit plongeur mobile 23 vissé dans le corps 22, dont l'enfoncement est susceptible de varier entre un enfoncement minimum emin, l'extrémité du petit plongeur mobile affleurant alors à l'extrémité du corps mobile 22 et la capacité ainsi réalisée étant une capacité Cmin correspondant à la fréquence la plus haute de la gamme d'accord Fmax, et un enfoncement maximum emax' le petit plongeur venant alors en butée à l'intérieur du corps 22 et la capacité ainsi réalisée étant la capacité maximum Cmax correspondant à la fréquence minimale de la gamme d'accord. De déplacement du petit plongeur peut être de l'ordre de 5 mm à 1 cm pour couvrir la gamme d'accord; la distance d entre les surfaces planes des deux doigts en regard pour l'enfoncement minimal du plongeur, de l'ordre de 5 dizièmes de millimètre, est ajustée définitivement pour la fréquence la plus élevée de la gamme, et seul le petit plongeur est déplacé pour obtenir les variations de la fréquence d'accord. L'extrémité du doigt 10, avec sa cavité, et l'extrémité du doigt 20, avec la surface plane de l'extrémité cylindrique du corps 22 et le plongeur 23, ont des formes à peu près complémentaires.The tuning device shown in FIG. 2 comprises a hollow fixed finger 10 and a movable finger 20 comprising a corpos, 22, movable in the wall 1, the movable body being held in position by a nut 21. This body 22 penetrates slightly in the cavity of the fixed finger 10. With this hollow movable body is associated a small movable plunger 23 screwed into the body 22, the depression of which is likely to vary between a minimum depression and e min , the end of the small movable plunger then being flush at the end of the movable body 22 and the capacity thus produced being a capacity C min corresponding to the highest frequency of the tuning range F max , and a maximum depression e max ' the small plunger then coming into abutment at l inside the body 22 and the capacity thus produced being the maximum capacity C max corresponding to the minimum frequency of the tuning range. Displacement of the small plunger can be in the range of 5 mm to 1 cm to cover the tuning range; the distance d between the flat surfaces of the two opposite fingers for the minimum insertion of the plunger, of the order of 5 tenths of a millimeter, is definitively adjusted for the highest frequency of the range, and only the small plunger is moved to get the variations of the tuning frequency. The end of the finger 10, with its cavity, and the end of the finger 20, with the flat surface of the cylindrical end of the body 22 and the plunger 23, have roughly complementary shapes.

La variation de capacité obtenue est telle que la fréquence d'accord varie quasi-linéairement avec l'enfoncement. Le petit plongeur 23 est fixé en position au moyen d'un écrou 24 en prenant appui sur la tête du corps mobile 22.The variation in capacitance obtained is such that the tuning frequency varies almost linearly with depression. The small plunger 23 is fixed in position by means of a nut 24 while resting on the head of the movable body 22.

La figure 3 représente un mode de réalisation analogue mais pour lequel le diamètre extérieur des doigts est grand par rapport au diamètre des extrémités cylindriques dont les faces planes en regard réalisent la capacité minimale et par rapport au diamètre du plongeur qui détermine la capacité variable supplémentaire qui lui est adjoutée. Le doigt fixe 10 et le corps 22 du doigt mobile 20 ont leurs extrémités amincies de façon que les surfaces planes en regard des extrémités des doigts, qui réalisent la capacité minimale Cmin soient assez faibles. Le corps mobile 22 ne pénètre pas dans la cavité du doigt fixe 10. Par contre le creux du doigt fixe 10 et le creux du corps 22 du doigt mobile ont le même diamètre, adapté au diamètre du petit plongeur mobile 23, les extrémités du doigt fixe et l'extrémité du corps du doigt mobile ont donc la même forme. La capacité minimale Cmin est adjustée lorsque le plongeur 23 est placé en position haute à l'enfoncement minimal emin et comme dans le mode de réalisation de la figure 2, la variation de capacité engendrée par le déplacement du plongeur est telle que la variation de fréquence d'accord est linéaire en fonction du déplacement du plongeur. Les diamètres respectifs du creux du doigt 10 et du plongeur sont tels que le déplacement du plongeur permette de couvrir la gamme de fréquences souhaitée. Un tel mode de réalisation du dispositif d'accord capacitif a permis de couvrir la gamme de fréquences d'accord 1,7 GHz à 2,1 GHz dans un filtre à mode évanescent, c'est-à-dire des fréquences relativement hautes, la capacité initiale pour la fréquence 2,1 GHz étant relativement faible.FIG. 3 represents an analogous embodiment but for which the outside diameter of the fingers is large relative to the diameter of the cylindrical ends whose opposite planar faces achieve the minimum capacity and relative to the diameter of the plunger which determines the additional variable capacity which is added to it. The fixed finger 10 and the body 22 of the movable finger 20 have their ends thinned so that the planar surfaces facing the ends of the fingers, which achieve the minimum capacity C min, are fairly small. The mobile body 22 does not enter the cavity of the fixed finger 10. On the other hand, the hollow of the fixed finger 10 and the hollow of the body 22 of the mobile finger have the same diameter, adapted to the diameter of the small mobile plunger 23, the ends of the finger fixed and the end of the body of the movable finger therefore have the same shape. The minimum capacity C min is adjusted when the plunger 23 is placed in the high position at the minimum insertion e min and as in the embodiment of FIG. 2, the variation in capacity generated by the displacement of the plunger is such that the variation tuning frequency is linear as a function of the displacement of the plunger. The respective diameters of the hollow of the finger 10 and of the plunger are such that the displacement of the plunger makes it possible to cover the desired frequency range. Such an embodiment of the capacitive tuning device has made it possible to cover the range of tuning frequencies 1.7 GHz to 2.1 GHz in a filter in evanescent mode, that is to say relatively high frequencies, the initial capacity for the 2.1 GHz frequency being relatively low.

Le mode de réalisation représenté sur la figure 4 permet de couvrir une gamme de fréquences relativement plus basse, la capacité Cmin réalisée pour la fréquence la plus haute de la gamme étant plus élevée que dans le mode de réalisation de la figure 3. Pour cela le corps creux 22 a son extrémité découpée de façon à pénétrer dans un creux de diamètre correspondant prévu dans le doigt fixe creux 10. Les extrémités du corps 22 du doigt mobile et l'extrémité du doigt fixe ont donc des formes complémentaires. Les surfaces planes et les surfaces cylindriques en regard du doigt fixe 10 et du corps 22 du doigt mobile 20 permettent de réaliser cette capacité Cmin pour la fréquence la plus haute de la gamme. Le corps 22 est alors fixé au moyen de l'écrou 21. La forme extérieure présentée par le dispositif d'accord à capacité variable dans le guide ne varie pas dans la gamme de fréquence d'accord. La variation de capacité supplémentaire est obtenue, comme dans les modes de réalisation des figures 2 et 3, par un petit plongeur 23, le doigt fixe comportant une seconde partie creuse, mais cette fois d'un diamètre correspondant au diamètre du petit plongeur. Comme précédemment, à partir de l'enfoncement minimal, la fréquence d'accord varie linéairement avec l'enfoncement du plongeur d'accord. Ce mode de réalisation a permis de réaliser un dispositif d'accord à capacité variable permettant l'accord dans la gamme 1,35 GHz à 1,7 GHz d'un filtre hyperfréquences en mode évanescent.The embodiment represented in FIG. 4 makes it possible to cover a relatively lower frequency range, the capacitance C min produced for the highest frequency in the range being higher than in the embodiment of FIG. 3. For this the hollow body 22 has its end cut so as to enter a hollow of corresponding diameter provided in the hollow fixed finger 10. The ends of the body 22 of the movable finger and the end of the fixed finger therefore have complementary shapes. The flat surfaces and the cylindrical surfaces opposite the fixed finger 10 and the body 22 of the movable finger 20 make it possible to achieve this capacity C min for the highest frequency in the range. The body 22 is then fixed by means of the nut 21. The external shape presented by the variable capacity tuning device in the guide does not vary in the tuning frequency range. The variation in additional capacity is obtained, as in the embodiments of FIGS. 2 and 3, by a small plunger 23, the fixed finger comprising a second hollow part, but this time with a diameter corresponding to the diameter of the small plunger. As before, from the minimum sinking, the tuning frequency varies linearly with the sinking of the tuning plunger. This embodiment made it possible to produce a tuning device with variable capacity allowing tuning in the 1.35 GHz to 1.7 GHz range of a microwave filter in evanescent mode.

La figure 5 représente un mode de réalisation d'un dispositif d'accord à capacité variable particulièrement destiné aux filtres dits "agiles" en fréquence, c'est-à-dire susceptibles de passer rapidement d'une fréquence d'accord à une autre dans une gamme déterminée. Le doigt fixe 10, le corps 22 du doigt mobile 20 et l'écrou 21 qui lui est lié sont les mêmes que ceux du mode de réalisation de la figure 2, si ce n'est que l'intérieur du corps 22 est lisse et non filetée. Par contre le plongeur mobile 25 a la forme d'un piston lisse susceptible de glisser dans le corps creux 22. Le contact électrique entre le piston 25 et le corps du filtre hyperfréquence est obtenu par l'intermédiaire du corps 22 au moyen d'un embout 26 formant pinces et prolongeant la partie intermédiaire du piston 25.FIG. 5 represents an embodiment of a variable capacity tuning device particularly intended for so-called "frequency agile" filters, that is to say capable of passing rapidly from one tuning frequency to another within a determined range. The fixed finger 10, the body 22 of the movable finger 20 and the nut 21 which is linked to it are the same as those of the embodiment of FIG. 2, except that the interior of the body 22 is smooth and not threaded. On the other hand, the mobile plunger 25 has the shape of a smooth piston capable of sliding in the hollow body 22. The electrical contact between the piston 25 and the body of the microwave filter is obtained by means of the body 22 by means of a end piece 26 forming clamps and extending the intermediate part of the piston 25.

Comme dans les modes de réalisation décrits ci-dessus la forme extérieure présentée par le dispositif d'accord à capacité variable est invariable quelle que soit la fréquence d'accord. Par conséquent dans toute la gamme de fréquence d'accord, le couplage du résonateur au résonateur voisin ou aux accès du filtre ne varie pas en fonction de la fréquence d'accord. De même, la bande passante est quasi-indépendante de la fréquence d'accord.As in the embodiments described above, the external shape presented by the variable capacity tuning device is invariable regardless of the tuning frequency. Consequently, throughout the tuning frequency range, the coupling of the resonator to the neighboring resonator or to the ports of the filter does not vary as a function of the tuning frequency. Similarly, the bandwidth is almost independent of the tuning frequency.

Il est à noter de plus que les modes de réalisation du dispositif d'accord à capacité variable décrits ci-dessus conduisent à des filtres très faciles à compenser en température. En effet, la variation de la fréquence d'accord étant une fonction linéaire de l'enfoncement du plongeur d'accord, et les allongements des différents éléments mécaniques constituant les éléments capacitifs suivant également des lois linéaires, les matériaux et les dimensions des éléments les uns par rapport aux autres peuvent être choisis de manière assez simple pour que la compensation du filtre en température puisse être réalisée dans toute la gamme d'accord. Ainsi le coefficient de surtension reste élevé dans toute la gamme de fréquences du filtre. Du fait que le petit plongeur a un diamètre faible par rapport au diamètre extérieur des deux doigts, la course du plongeur est grande par rappot aux modes de réalisation antérieurs et le réglage du filtre en est largement facilité. La résolution en est également largement améliorée.It should also be noted that the embodiments of the variable capacity tuning device described above lead to filters that are very easy to compensate for in temperature. Indeed, the variation of the tuning frequency being a linear function of the depression of the tuning plunger, and the elongations of the various mechanical elements constituting the capacitive elements also following linear laws, the materials and the dimensions of the elements relative to each other can be chosen in a fairly simple manner so that the temperature filter compensation can be achieved throughout the entire tuning range. Thus, the overvoltage coefficient remains high throughout the frequency range of the filter. Because the small plunger has a small diameter compared to the outer diameter of the two fingers, the stroke of the plunger is large compared to the previous embodiments and the adjustment of the filter is greatly facilitated. The resolution is also greatly improved.

L'invention n'est pas limitée aux modes de réalisation décrits et représentés. En particulier les formes extérieures du doigt fixe et du doigt mobile ne sont pas limitées aux formes décrites à titre d'exemple non limitatif en référence aux figures 1, 2, 3 et 4 (la figure 5 reprenant en cela la forme représentée sur la figure 2). Les formes sont déterminées à partir de la capacité minimale à réaliser, en particulier en liaision avec le diamètre des doigts et les dimensions des guides dans lesquels les dispositifs d'accord sont placés pour réaliser les filtres.The invention is not limited to the embodiments described and shown. In particular, the external shapes of the fixed finger and of the movable finger are not limited to the shapes described by way of nonlimiting example with reference to FIGS. 1, 2, 3 and 4 (FIG. 5 repeating in this the shape shown in Figure 2). The shapes are determined from the minimum capacity to be produced, in particular in conjunction with the diameter of the fingers and the dimensions of the guides in which the tuning devices are placed to produce the filters.

De plus, pour les filtres agiles en fréquence, il est possible d'utiliser un petit plongeur mobile en forme de piston du type de celui décrit en référence à la figure 5 à la place du plongeur mobile 23 utilisé dans les modes de réalisaticn des figures 2, 3 et 4 pour réaliser des filtres agiles dont les gammes de fréquence sont plus ou moins hautes.In addition, for frequency agile filters, it is possible to use a small mobile plunger in the shape of a piston of the type described with reference to FIG. 5 in place of the mobile plunger 23 used in the embodiments of the figures. 2, 3 and 4 to produce agile filters with higher or lower frequency ranges.

Par ailleurs, le doigt fixe a été, dans tous les modes de réalisation décrits, choisi comme étant le doigt creux, le doigt mobile dans le corps du filtre étant de doigt comportant le plongeur d'accord. Il est bien sür possible de faire le contraire, le doigt mobile par rapport au corps du filtre étant alors le doigt creux et le doigt fixe étant alors le doigt comportant le plongeur d'accord, le plongeur d'accord étant alors mobile dans un doigt fixe.Furthermore, the fixed finger has been, in all the embodiments described, chosen as being the hollow finger, the movable finger in the body of the filter being of finger comprising the tuning plunger. It is of course possible to do the opposite, the finger movable relative to the body of the filter then being the hollow finger and the fixed finger then being the finger comprising the chord plunger, the chord plunger then being movable in a finger fixed.

L'invention a également pour objet un filtre hyperfréquence accordable comportant au moins un tel dispositif d'accord à capacité variable, ce filtre pouvant être un filtre du type en guide d'onde à mode évanescent ou un filtre du type à ligne TEM comportant des éléments capacitifs localisés.The invention also relates to a tunable microwave filter comprising at least one such tuning device with variable capacity, this filter can be a filter of the waveguide type in evanescent mode or a filter of the TEM line type comprising Localized capacitive elements.

Claims (10)

1. Variable capacity tuning device, for tunable hyperfrequency filter, comprising two coaxial fingers movable with respect to each other, a first finger (10) being hollow and the second (20) comprising a plunger adapted to penetrate in the hollow part of the first finger (10) and movable with respect to it between a minimal sinking position where the plunger and the hollow finger have no opposite facing lateral surfaces and a maximal sinking position where the plunger and the hollow finger have maximal opposite facing lateral surfaces, in order to determine a first variable capacity component, charactei ized in that the second finger presents furthermore a cylindrical end having the same external diameter as a cylindrical end of the first finger, these two ends being intended to oppose each other by their plane faces and being movable with respect to each other, the variable distance (d) between the opposite facing plane surfaces of the cylindrical ends determining a second component of variable capacity.
2. Tuning device according to claim 1, characterized in that the second finger (20) formed of a cylindrical body extended by a plunger is an integral part, the displacement of the plunger with respect to the hollow finger (10) being obtained by displacement of the whole of the movable finger (20), the two components of the variable capacity varying at the same time.
3. Turning device according to claim 1, characterized in that the second finger (20) comprises a hollow body (22) and a plunger (23, 25) moveable with respect to the hollow body (22) of the same finger along their common axis in order to realize the first component of the variable capacity by sinking of the plunger (23, 25) in the hollow finger (10), the second component of the variable capacity being adjusted, when the plunger is in minimum sinking position, by adjusting the distance (d) between the plane surfaces of the cylindrical ends of the fingers by displacing one of the two fingers in its entirety, in the body of the filter, this minimum capacity determining the maximum tuning frequency of the device, the external shape of the tuning device thus being preserved during the sinking variation of the plunger.
4. Tuning device according to claim 3, characterized in that the second finger (20) comprising the moveable plunger (23) is the moveable finger.
5. Tuning device according to claim 3, characterized in that the hollow finger (10) is the moveable finger.
6. Tuning device according to any one of claim 3 to 5, characterized in that the hollow body (22) of the second finger has a threaded internal surface, the external surface of the plunger (23) being equally threaded and the sinking variation of the plunger (23) being ob- taiiied by screwing it in the corresponding hollow body (22).
7. Tuning device according to any one of claims 3 to 5, characterized in that the internal surface of the hollow body (22) of the second finger is smooth, the plunger having the shape of a piston (25), adapted to slide in the corresponding hollow body in order to obtain the sinking variation, clamp contacts (26) integral with the plunger bearing on the internal surface of the hollow body in order to ensure the electric contact between the plunger (25) and the hollow body (22).
8. Tuning device according to any one of claims 3 to 7, characterized in that the ends of the first and of the second finger have complementary shapes such that one of the fingers penetrates in the other, their opposite facing surfaces being formed, in addition to the cylindrical surfaces, of planes surfaces determining by their adjustable distance and their dimensions the second component of the variable capacity, this second component being, at the minimal sinking of the plunger, the minimal capacity of the tuning device thus formed.
9. Tuning device according to any one of claims 3 to 7, characterized in that the ends of the first finger (10) and of the hollow body (22) of the second finger (20) have the same shape and determine, by the adjustable distance between their opposite facing plane surfaces, the second component of the variable component that is the minimal capacity of the tuning device thus realized.
10. Tunable hyperfrequency filter comprising at least one variable capacity tuning device according to any one of the preceding claims.
EP81400240A 1980-03-04 1981-02-17 Tuning device with variable capacity and tunable microwave filter with at least one such device Expired EP0035922B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8004833 1980-03-04
FR8004833A FR2477783A1 (en) 1980-03-04 1980-03-04 VARIABLE CAPABILITY ADAPTER DEVICE AND TUNABLE HYPERFREQUENCY FILTER HAVING AT LEAST ONE SUCH DEVICE

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EP0035922A1 EP0035922A1 (en) 1981-09-16
EP0035922B1 true EP0035922B1 (en) 1984-06-20

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EP (1) EP0035922B1 (en)
JP (1) JPS56136001A (en)
DE (1) DE3164252D1 (en)
FR (1) FR2477783A1 (en)

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IT202100012983A1 (en) * 2021-05-19 2022-11-19 Commscope Italy Srl FIXING ELEMENT FOR THE RESONATOR OF A RADIOFREQUENCY FILTER

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FR762304A (en) * 1932-10-12 1934-04-09 Fed Telegraph Co Improvements to high frequency electrical circuits
FR880808A (en) * 1941-04-04 1943-04-06 Telefunken Gmbh Ultra-shortwave hollow chamber resonator
US2645679A (en) * 1947-11-29 1953-07-14 Standard Telephones Cables Ltd Method of controlling susceptance of a post type obstacle
FR1046593A (en) * 1951-05-11 1953-12-08 Centre Nat Rech Scient VHF and UHF tunable electromagnetic resonator and devices using this resonator
US3273083A (en) * 1964-04-14 1966-09-13 Motorola Inc Frequency responsive device
US3336542A (en) * 1965-09-03 1967-08-15 Marconi Co Canada Tunable coaxial cavity resonator
US3480889A (en) * 1966-07-25 1969-11-25 Patelhold Patentverwertung Temperature stabilized cavity resonator
FR2149130A5 (en) * 1971-07-30 1973-03-23 Cossor Ltd A C
US3733567A (en) * 1971-04-13 1973-05-15 Secr Aviation Coaxial cavity resonator with separate controls for frequency tuning and for temperature coefficient of resonant frequency adjustment
US3737816A (en) * 1970-09-15 1973-06-05 Standard Telephones Cables Ltd Rectangular cavity resonator and microwave filters built from such resonators
DE2412759A1 (en) * 1974-03-16 1975-09-25 Hirschmann Radiotechnik High frequency filter with two or more resonant circuits - has ceramic capacitor tuning using trimming capacitors
US4001737A (en) * 1975-10-24 1977-01-04 The United States Of America As Represented By The Field Operations Bureau Of The Federal Communications Commission Cavity tuning assembly having coarse and fine tuning means
GB2006539A (en) * 1977-05-25 1979-05-02 Marconi Co Ltd Dual Evanescent Mode Waveguide Filter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR762304A (en) * 1932-10-12 1934-04-09 Fed Telegraph Co Improvements to high frequency electrical circuits
FR880808A (en) * 1941-04-04 1943-04-06 Telefunken Gmbh Ultra-shortwave hollow chamber resonator
US2645679A (en) * 1947-11-29 1953-07-14 Standard Telephones Cables Ltd Method of controlling susceptance of a post type obstacle
FR1046593A (en) * 1951-05-11 1953-12-08 Centre Nat Rech Scient VHF and UHF tunable electromagnetic resonator and devices using this resonator
US3273083A (en) * 1964-04-14 1966-09-13 Motorola Inc Frequency responsive device
US3336542A (en) * 1965-09-03 1967-08-15 Marconi Co Canada Tunable coaxial cavity resonator
US3480889A (en) * 1966-07-25 1969-11-25 Patelhold Patentverwertung Temperature stabilized cavity resonator
US3737816A (en) * 1970-09-15 1973-06-05 Standard Telephones Cables Ltd Rectangular cavity resonator and microwave filters built from such resonators
US3733567A (en) * 1971-04-13 1973-05-15 Secr Aviation Coaxial cavity resonator with separate controls for frequency tuning and for temperature coefficient of resonant frequency adjustment
FR2149130A5 (en) * 1971-07-30 1973-03-23 Cossor Ltd A C
DE2412759A1 (en) * 1974-03-16 1975-09-25 Hirschmann Radiotechnik High frequency filter with two or more resonant circuits - has ceramic capacitor tuning using trimming capacitors
US4001737A (en) * 1975-10-24 1977-01-04 The United States Of America As Represented By The Field Operations Bureau Of The Federal Communications Commission Cavity tuning assembly having coarse and fine tuning means
GB2006539A (en) * 1977-05-25 1979-05-02 Marconi Co Ltd Dual Evanescent Mode Waveguide Filter

Also Published As

Publication number Publication date
JPS56136001A (en) 1981-10-23
JPS6151442B2 (en) 1986-11-08
FR2477783B1 (en) 1984-09-21
DE3164252D1 (en) 1984-07-26
US4380747A (en) 1983-04-19
FR2477783A1 (en) 1981-09-11
EP0035922A1 (en) 1981-09-16

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