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EP0254373A1 - Antenna for high frequencies - Google Patents

Antenna for high frequencies Download PDF

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Publication number
EP0254373A1
EP0254373A1 EP87201401A EP87201401A EP0254373A1 EP 0254373 A1 EP0254373 A1 EP 0254373A1 EP 87201401 A EP87201401 A EP 87201401A EP 87201401 A EP87201401 A EP 87201401A EP 0254373 A1 EP0254373 A1 EP 0254373A1
Authority
EP
European Patent Office
Prior art keywords
impedance
wire line
dipole
antenna
length
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.)
Granted
Application number
EP87201401A
Other languages
German (de)
French (fr)
Other versions
EP0254373B1 (en
Inventor
Pierre Société Civile S.P.I.D. Chanteau
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.)
Koninklijke Philips NV
Original Assignee
Philips Electronique Gran Public
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication of EP0254373A1 publication Critical patent/EP0254373A1/en
Application granted granted Critical
Publication of EP0254373B1 publication Critical patent/EP0254373B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/48—Combinations of two or more dipole type antennas

Definitions

  • the subject of the present invention is a reception antenna for receiving high frequency electromagnetic signals consisting of a biconical dipole full wave of impedance Z1 for the reception of a first frequency range, which dipole comprises two V-shaped unipoles , or U, located in the same plane on either side of an axis of symmetry, the bisector of the two V's being common and substantially perpendicular to said axis of symmetry, each unipole having a vertex and a characteristic length L1 related with a wavelength ⁇ 1 chosen from the wavelengths of said first frequency range.
  • Such antennas are in particular intended for the reception of television broadcasts.
  • Biconical dipoles are well known and described for example in the publication "Antenna Engineering Handbook” by Henry JASIK published by Mac Graw-Hill more particularly pages 3.11 and 3.12. This publication explains in particular that the impedance of the dipole varies as a function of the geometry of the dipole and the frequency of the electromagnetic signals so that a dipole of given dimensions can receive, satisfactorily, only one octave in frequency .
  • the object of the present invention is to enlarge the possibilities of reception of such an antenna.
  • the two-wire line functionally constitutes an antenna descent to conduct the signals available between the two vertices of the dipole to the free ends of the two-wire line
  • the two-wire line functionally forms part of the antenna itself; the antenna delivers the signals received at the free end of the two-wire line; an antenna according to the invention thus delivers signals corresponding to two frequency ranges.
  • said first frequency range being the UHF band
  • such an antenna is particularly remarkable in that the said second frequency range is the VHF band
  • the said doublet is a half-wave doublet (X / 2)
  • such an antenna is capable of receiving UHF and VHF transmissions simultaneously; for domestic television reception applications in individuals, such a so-called mixed antenna is particularly practical because it is economical, easy to produce and takes up little space.
  • the impedance Z1 of the biconical dipole being practically equal to 300 ohms
  • a preferred embodiment is characterized in that the impedance Z'1 of the two-wire line substantially equal to the impedance Z1 of 300 ohms is obtained by two conductors each consisting of a sheet of ferrous metal having substantially 5 mm wide and 0.4 mm thick, the two sheets being placed face to face at a distance of about 20 mm from each other, symmetrically with respect to said axis of symmetry of the dipole.
  • This embodiment is more particularly economical.
  • an antenna according to the invention further comprising an output terminal (S) and a ground (M) for delivering the electrical signals received at an impedance substantially equal to 75 ohms whatever the frequency range considered, is particularly remarkable in that firstly for UHF reception, on the one hand a first free end of the two-wire line is connected directly to said output terminal while, on the other hand, the second free end of the two-wire line is connected to the same output terminal via a balun and an impedance transformer (SYTR) of ratio 4, secondly for VHF reception, on the one hand said output terminal is isolated from the balun to by means of a high-pass filter, on the other hand the second free end of the two-wire line is connected to said mass by means of a low-pass filter.
  • SYTR impedance transformer
  • the coaxial antenna down cable is adapted in impedance, substantially 75 ohms, both in UHF and in VHF.
  • the present invention has in particular been designed for the UHF and VHF bands but it is clear that by suitably modifying the dimensions of the dipole and the two-wire line, an antenna adapted to other frequency bands is obtained without departing from the scope of the invention. 'invention.
  • Figure 1 shows a block diagram of a mixed VHF / UHF antenna.
  • FIG. 2 represents a perspective view of an embodiment.
  • connection between the symmetrizer SYTR and the output terminal S is provided with a high-pass filter consisting of a capacity CPH, for example 12 pFarad
  • FIG. 2 are shown the metallic elements constituting an embodiment of an antenna conforming to the diagram of FIG. 1.
  • the two unipoles U1, U2 are U-shaped; the length L1 is 200 mm; the vertices S1, S2 of the unipoles are respectively connected the two conductors BF1, BF2 of the two-wire line whose length 1 is 130 mm; all these elements are made of tinned iron of 0.4 x 5; the two conductors BF1, BF2 are arranged face to face at a distance E of 20 mm.
  • the transmitter is in the direction of the arrow EM, it is advantageous to have a director strand BD at a distance D of 30 mm from the plane of the dipole; the length of the BDL director strand is 150 mm.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The antenna comprises a dipole U1, U2 connected to a bifilar line BF1, BF2. For a first waveband (UHF) the bifilar line has an antenna descent function. For a second waveband (VHF) the bifilar line and the dipole cooperate to form a half-wave doublet antenna. <IMAGE>

Description

La présente invention a pour objet une antenne de réception pour recevoir des signaux électromagnétiques à hautes fréquences constituée d'un dipole biconique onde entière d'impédance Z1 pour la réception d'une première gamme de fréquences, lequel dipole comporte deux unipoles en forme de V, ou de U, situés dans un même plan de part et d'autre d'un axe de symétrie, la bissectrice des deux V étant commune et sensiblement perpendiculaire audit axe de symétrie, chaque unipole ayant un sommet et une longueur caractéristique L1 en rapport avec une longueur d'onde À1 choisie parmi les longueurs d'onde de la dite première gamme de fréquences.The subject of the present invention is a reception antenna for receiving high frequency electromagnetic signals consisting of a biconical dipole full wave of impedance Z1 for the reception of a first frequency range, which dipole comprises two V-shaped unipoles , or U, located in the same plane on either side of an axis of symmetry, the bisector of the two V's being common and substantially perpendicular to said axis of symmetry, each unipole having a vertex and a characteristic length L1 related with a wavelength λ1 chosen from the wavelengths of said first frequency range.

De telles antennes sont notamment destinées à la réception des émissions de télévision.Such antennas are in particular intended for the reception of television broadcasts.

Les dipoles biconiques sont bien connus et décrits par exemple dans la publication "Antenna Engineering Handbook" de Henry JASIK édité chez Mac Graw-Hill plus particulièrement pages 3.11 et 3.12. Cette publication expose notamment que l'impédance du dipole varie en fonction de la géométrie du dipole et de la fréquence des signaux électromagnétiques de telle sorte qu'un dipole de dimensions données ne peut recevoir, de manière satisfaisante, qu'une seule octave en fréquence.Biconical dipoles are well known and described for example in the publication "Antenna Engineering Handbook" by Henry JASIK published by Mac Graw-Hill more particularly pages 3.11 and 3.12. This publication explains in particular that the impedance of the dipole varies as a function of the geometry of the dipole and the frequency of the electromagnetic signals so that a dipole of given dimensions can receive, satisfactorily, only one octave in frequency .

La présente invention a pour but d'agrandir les possibilités de réception d'une telle antenne.The object of the present invention is to enlarge the possibilities of reception of such an antenna.

Selon la présente invention une antenne de réception constituée d'un dipole biconique est particulièrement remarquable en ce qu'elle comporte en outre une ligne bifilaire ladite ligne bifilaire étant constituée de deux conducteurs situés en vis à vis, parallèles entre eux et au dit axe de symétrie, et ayant une extrémité respectivement connectée à un sommet d'un des deux unipoles, en ce que la dite ligne bifilaire, pour la dite première gamme de fréquence, a une impédance Z'1 sensiblement égale à la dite impédance Z1 du dipole, en ce que la dite ligne bifilaire a une longueur 'l' telle que, en coopération avec le dipole biconique, il est constitué un doublet dont chaque brin a une longueur 'L2' sensiblement égale à la somme 'L1' plus 'l' (L2 = L1 + 1), la longueur L2 étant en rapport avec une longueur d'onde λ2 choisie parmi les longueurs d'onde d'une deuxième gamme de fréquences à recevoir, la réception de cette deuxième gamme de fréquences s'effectuant en simultanéité avec la dite première gamme de fréquence.According to the present invention a receiving antenna consisting of a biconical dipole is particularly remarkable in that it further comprises a two-wire line said two-wire line consisting of two conductors located opposite, parallel to each other and to said axis of symmetry, and having one end respectively connected to a vertex of one of the two unipoles, in that the said bifi line laire, for said first frequency range, has an impedance Z'1 substantially equal to said impedance Z1 of the dipole, in that said two-wire line has a length 'l' such that, in cooperation with the biconical dipole, it a doublet is formed, each strand of which has a length 'L2' substantially equal to the sum 'L1' plus 'l' (L2 = L1 + 1), the length L2 being related to a wavelength λ2 chosen from the lengths wave of a second frequency range to be received, the reception of this second frequency range taking place simultaneously with said first frequency range.

Dans une telle antenne, d'une part pour la première gamme de fréquences la ligne bifilaire constitue fonctionnellement une descente d'antenne pour conduire les signaux disponibles entre les deux sommets du dipole jusqu'aux extrémités libres de la ligne bifilaire, d'autre part pour la deuxième gamme de fréquence la ligne bifilaire constitue fonctionnellement une partie de l'antenne elle-même; l'antenne délivre les signaux reçus à l'extrémité libre de la ligne bifilaire; une antenne conforme à l'invention délivre ainsi des signaux correspondant à deux gammes de fréquences.In such an antenna, on the one hand for the first frequency range the two-wire line functionally constitutes an antenna descent to conduct the signals available between the two vertices of the dipole to the free ends of the two-wire line, on the other hand for the second frequency range the two-wire line functionally forms part of the antenna itself; the antenna delivers the signals received at the free end of the two-wire line; an antenna according to the invention thus delivers signals corresponding to two frequency ranges.

Dans un mode préféré de réalisation, la dite première gamme de fréquence étant la bande UHF, la dite longueur L1 (= X/2) étant alors comprise entre .31 cm et 17 cm, de préférence L1 = 20 centimètres, une telle antenne est particulièrement remarquable en ce que la dite deuxième gamme de fréquence est la bande VHF, le dit doublet est un doublet demi-onde (X/2), la dite longueur L2 est comprise entre 40 cm et 30 cm de préférence L2 = 33 cm, ce qui correspond à 1 = 13 cm.In a preferred embodiment, said first frequency range being the UHF band, said length L1 (= X / 2) then being between .31 cm and 17 cm, preferably L1 = 20 cm, such an antenna is particularly remarkable in that the said second frequency range is the VHF band, the said doublet is a half-wave doublet (X / 2), the said length L2 is between 40 cm and 30 cm preferably L2 = 33 cm, which corresponds to 1 = 13 cm.

Ainsi une telle antenne est apte à recevoir simultanément les émissions UHF et VHF; pour les applications domestiques de réception de télévision chez les particuliers, une telle antenne, dite mixte, est particulièrement pratique parce que économique, facile à réaliser et peu encombrante.Thus, such an antenna is capable of receiving UHF and VHF transmissions simultaneously; for domestic television reception applications in individuals, such a so-called mixed antenna is particularly practical because it is economical, easy to produce and takes up little space.

Pour adapter les impédances Z1 et Z'1, l'impédance Z1 du dipole biconique étant pratiquement égale à 300 ohms, un mode préféré de réalisation est caractérisé en ce que l'impédance Z'1 de la ligne bifilaire sensiblement égale à l'impédance Z1 de 300 ohms est obtenue par deux conducteurs constitués chacun d'une tôle de métal ferreux ayant sensiblement 5 mm de large et 0,4 mm d'épaisseur, les deux tôles étant disposées face à face à une distance d'environ 20 mm l'une de l'autre, symétriquement par rapport au dit axe de symétrie du dipole.To adapt the impedances Z1 and Z'1, the impedance Z1 of the biconical dipole being practically equal to 300 ohms, a preferred embodiment is characterized in that the impedance Z'1 of the two-wire line substantially equal to the impedance Z1 of 300 ohms is obtained by two conductors each consisting of a sheet of ferrous metal having substantially 5 mm wide and 0.4 mm thick, the two sheets being placed face to face at a distance of about 20 mm from each other, symmetrically with respect to said axis of symmetry of the dipole.

Ce mode de réalisation est plus particulièrement économique.This embodiment is more particularly economical.

Pour les applications domestiques, les prises d'antenne des téléviseurs ont été standardisées pour un câble coaxial ayant une impédance de 75 ohms; pour satisfaire ce standard, une antenne selon l'invention comportant en outre une borne de sortie (S) et une masse (M) pour délivrer les signaux électriques reçus sous une impédance sensiblement égale à 75 ohms quelle que soit la gamme de fréquence considérée, est particulièrement remarquable en ce que premièrement pour la réception UHF, d'une part une première extrémité libre de la ligne bifilaire est connectée directement à la dite borne de sortie alors que, d'autre part, la deuxième extrémité libre de la ligne bifilaire est connectée à la même borne de sortie par l'intermédiaire d'un symétriseur et d'un transformateur d'impédance (SYTR) de rapport 4, deuxièmement pour la réception VHF, d'une part la dite borne de sortie est isolée du symétriseur au moyen d'un filtre passe-haut, d'autre part la deuxième extrémité libre de la ligne bifilaire est connectée à la dite masse au moyen d'un filtre passe-bas.For domestic applications, the antenna sockets of televisions have been standardized for a coaxial cable having an impedance of 75 ohms; to meet this standard, an antenna according to the invention further comprising an output terminal (S) and a ground (M) for delivering the electrical signals received at an impedance substantially equal to 75 ohms whatever the frequency range considered, is particularly remarkable in that firstly for UHF reception, on the one hand a first free end of the two-wire line is connected directly to said output terminal while, on the other hand, the second free end of the two-wire line is connected to the same output terminal via a balun and an impedance transformer (SYTR) of ratio 4, secondly for VHF reception, on the one hand said output terminal is isolated from the balun to by means of a high-pass filter, on the other hand the second free end of the two-wire line is connected to said mass by means of a low-pass filter.

Ainsi le câble coaxial de descente d'antenne, dont l'âme est connectée à la borne de sortie S et dont la tresse est connectée à la masse M, est adapté en impédance, sensiblement 75 ohms, tant en UHF qu'en VHF.Thus the coaxial antenna down cable, the core of which is connected to the output terminal S and the braid of which is connected to ground M, is adapted in impedance, substantially 75 ohms, both in UHF and in VHF.

Il est aussi avantageux selon l'invention de munir l'antenne d'un ou plusieurs éléments parasites directeurs et/ou réflecteurs afin de convertir le diagramme de directivité de l'antenne d'une forme bidirectionnelle en une forme unidirectionnelle.It is also advantageous according to the invention to provide the antenna with one or more parasitic guiding elements and / or reflectors in order to convert the directivity diagram of the antenna from a bidirectional shape to a unidirectional shape.

La présente invention a notamment été conçue pour les bandes UHF et VHF mais il est clair qu'en modifiant convenablement les dimensions du dipole et de la ligne bifilaire, on obtient une antenne adaptée à d'autres bandes de fréquence sans sortir du cadre de l'invention.The present invention has in particular been designed for the UHF and VHF bands but it is clear that by suitably modifying the dimensions of the dipole and the two-wire line, an antenna adapted to other frequency bands is obtained without departing from the scope of the invention. 'invention.

La présente invention sera mieux comprise à l'aide d'un exemple de réalisation non limitatif décrit à l'aide des dessins annexés.The present invention will be better understood with the aid of a nonlimiting exemplary embodiment described with the aid of the appended drawings.

La figure 1 représente un schéma de principe d'une antenne mixte VHF/UHF.Figure 1 shows a block diagram of a mixed VHF / UHF antenna.

La figure 2 représente une vue perspective d'un mode de réalisation.FIG. 2 represents a perspective view of an embodiment.

Sur la figure 1 le dipole biconique comporte deux unipoles U1 et U2 sensiblement symétriques par rapport à l'axe de symétrie PS; chaque unipole a une longueur L1; la ligne bifilaire est constituée de deux conducteurs BF1 et BF2 situés en vis à vis, parallèles entre eux et au dit axe de symétrie PS; les conducteurs BF1 et BF2 sont respectivement connectés à un sommet d'un des deux unipoles soit S1 pour BF1, et S2 pour BF2; la longueur 1 de chaque conducteur BF1 ou BF2 s'ajoute à la longueur L1 pour constituer un doublet de longueur L2 = 1 + L1; l'impédance Z'1 de la ligne bifilaire est sensiblement égale à l'impédance Z1 du dipole biconique; ainsi la ligne bifilaire, d'une part joue le rôle de descente d'antenne pour le dipole biconique adapté à une première gamme de fréquence, d'autre part est un élément d'une antenne doublet pour une deuxième gamme de fréquence; dans les deux cas les signaux reçus sont disponibles entre les extrémités S et EL de la ligne bifilaire.In Figure 1 the biconical dipole comprises two unipoles U1 and U2 substantially symmetrical with respect to the axis of symmetry PS; each unipole has a length L1; the two-wire line consists of two conductors BF1 and BF2 located opposite, parallel to each other and to said axis of symmetry PS; the conductors BF1 and BF2 are respectively connected to a vertex of one of the two unipoles, ie S1 for BF1, and S2 for BF2; the length 1 of each conductor BF1 or BF2 is added to the length L1 to constitute a doublet of length L2 = 1 + L1; the impedance Z'1 of the two-wire line is substantially equal to the impedance Z1 of the biconical dipole; thus the two-wire line, on the one hand plays the role of antenna descent for the biconical dipole adapted to a first frequency range, on the other hand is an element of a doublet antenna for a second frequency range; in both cases the signals received are available between the S and EL ends of the two-wire line.

Pour le cas particulier non limitatif où la première gamme de fréquence est la bande UHF et où la deuxième gamme de fréquence est la bande VHF, l'antenne a notamment les dimensions suivantes :

  • - dipole UHF onde entière : L1 comprise entre 31 et 17 cm, de préférence 20 cm.
  • - doublet VHF demi-onde : L2 comprise entre 40 et 30 cm, de préférence 33 cm soit 1 (= L2 - L1) égale à 13 cm.
For the particular non-limiting case where the first frequency range is the UHF band and where the second frequency range is the VHF band, the antenna has the following dimensions in particular:
  • - UHF full wave dipole: L1 between 31 and 17 cm, preferably 20 cm.
  • - VHF half-wave doublet: L2 between 40 and 30 cm, preferably 33 cm or 1 (= L2 - L1) equal to 13 cm.

Pour une utilisation domestique, par exemple de réception de télévision avec un récepteur prévu pour une impédance d'antenne de 75 ohms, la connexion d'un câble coaxial (non représenté) de descente d'antenne s'effectue entre la borne de sortie S et la masse M; l'adaptation d'impédance indispensable est réalisée préférentiellement de la manière suivante :

  • - pour le dipole UHF biconique au moyen d'un symétriseur et d'un transformateur d'impédance SYTR dont le rapport est 4 puisque l'impédance Z1 est sensiblement de 300 ohms.
  • - pour le doublet VHF les éléments constituants sont choisis tels que son impédance soit sensiblement de 75 ohms.
For domestic use, for example for television reception with a receiver provided for an antenna impedance of 75 ohms, the connection of a coaxial cable (not shown) for antenna drop is made between the output terminal S and the mass M; the essential impedance matching is preferably carried out as follows:
  • - for the biconical UHF dipole by means of a balun and an impedance transformer SYTR whose ratio is 4 since the impedance Z1 is substantially 300 ohms.
  • - for the VHF doublet the constituent elements are chosen such that its impedance is substantially 75 ohms.

Pour éviter de court-circuiter le dipole UHF, sans pour autant couper le doublet VHF, d'une part la connexion entre le symétriseur SYTR et la borne de sortie S est munie d'un filtre passe-haut constitué d'une capacité CPH, par exemple de 12 pFarad, d'autre part la borne EL est connectée à la masse M par l'intermédiaire d'un filtre passe-bas lequel est constitué d'un circuit LLC avec L1PB = 70 nHenry, L2PB = 70 nHenry et CPB = 18 pFarad.To avoid short-circuiting the UHF dipole, without cutting the VHF doublet, on the one hand, the connection between the symmetrizer SYTR and the output terminal S is provided with a high-pass filter consisting of a capacity CPH, for example 12 pFarad, on the other hand the EL terminal is connected to ground M via a low-pass filter which consists of an LLC circuit with L1PB = 70 nHenry, L2PB = 70 nHenry and CPB = 18 pFarad.

Sur la figure 2 sont représentés les éléments métalliques constitutifs d'un mode de réalisation d'une antenne conforme au schéma de la figure 1.In FIG. 2 are shown the metallic elements constituting an embodiment of an antenna conforming to the diagram of FIG. 1.

Les deux unipoles U1, U2 sont en forme de U; la longueur L1 est de 200 mm; aux sommets S1, S2 des unipoles sont connectés respectivement les deux conducteurs BF1, BF2 de la ligne bifilaire dont la longueur 1 est de 130 mm; tous ces éléments sont en fer étamé de 0,4 x 5; les deux conducteurs BF1, BF2 sont disposés face à face à une distance E de 20 mm.The two unipoles U1, U2 are U-shaped; the length L1 is 200 mm; the vertices S1, S2 of the unipoles are respectively connected the two conductors BF1, BF2 of the two-wire line whose length 1 is 130 mm; all these elements are made of tinned iron of 0.4 x 5; the two conductors BF1, BF2 are arranged face to face at a distance E of 20 mm.

Si l'émetteur est dans la direction de la flèche EM, il est avantageux de disposer un brin directeur BD à une distance D de 30 mm du plan du dipole; la longueur du brin directeur BDL est de 150 mm.If the transmitter is in the direction of the arrow EM, it is advantageous to have a director strand BD at a distance D of 30 mm from the plane of the dipole; the length of the BDL director strand is 150 mm.

Avec une telle antenne, les mesures électriques font apparaître un gain de 2 à 3 dB suivant la fréquence entre 470 et 860 MHz (UHF), et de -2 à -6 dB de 175 à 225 MHz (VHF) par rapport au doublet demi-onde.With such an antenna, electrical measurements show a gain of 2 to 3 dB depending on the frequency between 470 and 860 MHz (UHF), and from -2 to -6 dB of 175 to 225 MHz (VHF) compared to the half doublet -wave.

Il est clair qu'une antenne mixte UHF/VHF telle que décrite est un exemple avantageux de réalisation mais il est aussi possible, en modifiant les diverses caractéristiques géométriques et électriques de l'antenne pour l'adapter à d'autres gammes de fréquence, par exemple UHF et FM, de réaliser d'autres antennes mixtes sans sortir du cadre de la présente invention.It is clear that a mixed UHF / VHF antenna as described is an advantageous example of embodiment, but it is also possible, by modifying the various geometric and electrical characteristics of the antenna to adapt it to other frequency ranges, for example UHF and FM, to produce other mixed antennas without departing from the scope of the present invention.

Claims (6)

1. Antenne de réception pour recevoir des signaux électromagnétique à hautes fréquences constituée d'un dipole biconique onde entière d'impédance Z1 pour la réception d'une première gamme de fréquences, lequel dipole comporte deux unipoles en forme de V, ou de U, situés dans un même plan de part et d'autre d'un axe de symétrie, la bissectrice des deux V étant commune et sensiblement perpendiculaire audit axe de symétrie, chaque unipole ayant un sommet et une longueur caractéristique L1 en rapport avec une longueur d'onde λ1 choisie parmi les longueurs d'onde de la dite première gamme de fréquences caractérisée en ce que elle comporte en outre une ligne bifilaire ladite ligne bifilaire étant constituée de deux conducteurs situés en vis à vis, parallèles entre eux et au dit axe de symétrie, et ayant une extrémité respectivement connectée à un sommet d'un des deux unipoles, en ce que la dite ligne bifilaire, pour la dite première gamme de fréquence, a une impédance Z'1 sensiblement égale à la dite impédance Z1 du dipole, en ce que la dite ligne bifilaire a une longueur 'l' telle que, en Coopération avec le dipole biconique, il est constitué un doublet dont chaque brin a une longueur 'L2' sensiblement égale à la somme 'L1' plus. '1' (L2 = L1 + 1), la longueur L2 étant en rapport avec une longueur d'onde λ2 choisie parmi les longueurs d'onde d'une deuxième gamme de fréquences à recevoir, la réception de cette deuxième gamme de fréquences s'effectuant en simultanéité avec la dite première gamme de fréquence.1. Reception antenna for receiving high frequency electromagnetic signals consisting of a biconical dipole whole wave of impedance Z1 for the reception of a first range of frequencies, which dipole comprises two unipoles in the form of V, or U, located in the same plane on either side of an axis of symmetry, the bisector of the two V's being common and substantially perpendicular to said axis of symmetry, each unipole having a vertex and a characteristic length L1 in relation to a length of λ1 wave chosen from the wavelengths of said first frequency range characterized in that it further comprises a two-wire line said two-wire line consisting of two conductors located opposite, parallel to each other and to said axis of symmetry , and having one end respectively connected to a vertex of one of the two unipoles, in that said two-wire line, for said first frequency range, has an impedance Z'1 substantially equal to the said impedance Z1 of the dipole, in that the said two-wire line has a length 'l' such that, in Cooperation with the biconical dipole, a doublet is made up of which each strand has a length 'L2' substantially equal to the sum 'L1' more. '1' (L2 = L1 + 1), the length L2 being related to a wavelength λ2 chosen from the wavelengths of a second range of frequencies to be received, the reception of this second range of frequencies s 'performing simultaneously with said first frequency range. 2. Antenne selon la revendication 1, la dite première gamme de fréquence étant la bande UHF, la dite longueur L1 (= λ/2) étant alors comprise entre 31 cm et 17 cm, de préférence L1 = 20 centimètres caractérisée en ce que la dite deuxième gamme de fréquence est la bande VHF, le dit doublet est un doublet demi-onde (λ/2), la dite longueur L2 est comprise entre 40 cm et 30 cm de préférence L2 = 33 cm, ce qui correspond à 1 = 13 cm.2. Antenna according to claim 1, said first frequency range being the UHF band, said length L1 (= λ / 2) then being between 31 cm and 17 cm, preferably L1 = 20 centimeters characterized in that the said second frequency range is the VHF band, the said doublet is a half-wave doublet (λ / 2), the said length L2 is between 40 cm and 30 cm preferably L2 = 33 cm, which corresponds to 1 = 13 cm. 3. Antenne selon la revendication 2, l'impédance Z1 du dipole biconique étant pratiquement égale à 300 ohms, caractérisée en ce que, l'impédance Z'1 de la ligne bifilaire sensiblement égale à l'impédance Z1 de 300 ohms est obtenue par deux conducteurs constitués chacun d'une tôle de métal ferreux ayant sensiblement 5 mm de large et 0,4 mm d'épaisseur, les deux tôles étant disposées face à face à une distance d'environ 20 mm l'une de l'autre, symétriquement par rapport au dit plan de symétrie du dipole.3. Antenna according to claim 2, the impedance Z1 of the biconical dipole being practically equal to 300 ohms, character mock in that the impedance Z'1 of the two-wire line substantially equal to the impedance Z1 of 300 ohms is obtained by two conductors each consisting of a sheet of ferrous metal having substantially 5 mm wide and 0.4 mm thick, the two sheets being placed face to face at a distance of about 20 mm from each other, symmetrically with respect to said plane of symmetry of the dipole. 4. Antenne selon la revendication 3 comportant en outre une borne de sortie (S) et une masse (M) pour délivrer les signaux électriques reçus sous une impédance sensiblement égale à 75 ohms quelle que soit la gamme de fréquence considérée, caractérisée en ce que, premièrement pour la réception UHF, d'une part une première extrémité libre de la ligne bifilaire est connectée directement à la dite borne de sortie alors que, d'autre part, la deuxième extrémité libre de la ligne bifilaire est connectée à la même borne de sortie par l'intermédiaire d'un symétriseur et d'un transformateur d'impédance (SYTR) de rapport 4, deuxièmement pour la réception VHF, d'une part la dite borne de sortie est isolée du symétriseur au moyen d'un filtre passe-haut, d'autre part la deuxième extrémité libre de la ligne bifilaire est connectée à la dite masse au moyen d'un filtre passe-bas.4. Antenna according to claim 3 further comprising an output terminal (S) and a ground (M) for delivering the electrical signals received at an impedance substantially equal to 75 ohms whatever the frequency range considered, characterized in that , firstly for UHF reception, on the one hand a first free end of the two-wire line is connected directly to said output terminal while, on the other hand, the second free end of the two-wire line is connected to the same terminal output via a balun and an impedance transformer (SYTR) of ratio 4, secondly for VHF reception, on the one hand said output terminal is isolated from the balun by means of a filter high pass, on the other hand the second free end of the two-wire line is connected to said mass by means of a low-pass filter. 5. Antenne selon la revendication 4 caractérisée en ce que le dit filtre passe-haut est une capacité d'une valeur de 12 pFarad et en ce que le dit filtre passe-bas est composé d'un circuit LLC avec L1 = 70 nHenry, L2 = 70 nHenry, C = 180 pFarad.5. Antenna according to claim 4 characterized in that the said high-pass filter has a capacity of a value of 12 pFarad and in that the said low-pass filter is composed of an LLC circuit with L1 = 70 nHenry, L2 = 70 n Henry, C = 180 pFarad. 6. Antenne selon l'une quelconque des revendications précédentes caractérisée en ce qu'elle est munie d'un ou plusieurs éléments parasites directeurs et/ou réflecteurs afin de convertir le diagramme de directivité de l'antenne d'une forme bidirectionnelle en une forme unidirectionnelle.6. Antenna according to any one of the preceding claims, characterized in that it is provided with one or more guiding and / or reflective parasitic elements in order to convert the directivity diagram of the antenna from a bidirectional shape to a shape unidirectional.
EP87201401A 1986-07-23 1987-07-21 Antenna for high frequencies Expired - Lifetime EP0254373B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8610690 1986-07-23
FR8610690A FR2602097B1 (en) 1986-07-23 1986-07-23 ANTENNA FOR HIGH FREQUENCY SIGNALS

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EP0254373A1 true EP0254373A1 (en) 1988-01-27
EP0254373B1 EP0254373B1 (en) 1991-06-05

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EP87201401A Expired - Lifetime EP0254373B1 (en) 1986-07-23 1987-07-21 Antenna for high frequencies

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JP (1) JPS6340401A (en)
DE (1) DE3770533D1 (en)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032359A1 (en) * 1996-02-27 1997-09-04 Thomson Consumer Electronics, Inc. Folded bow-tie antenna
WO2004027929A1 (en) * 2002-09-16 2004-04-01 Kathrein-Werke Kg Antenna assembly comprising a surface dipole

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GB580812A (en) * 1943-12-06 1946-09-20 Standard Telephones Cables Ltd Improvements in arrangements for coupling wide frequency band antennae to transmission lines
DE943834C (en) * 1939-08-05 1956-06-01 Fernseh Gmbh Antenna system
GB807961A (en) * 1956-03-16 1959-01-28 Belling & Lee Ltd Improvements in aerials
US3541556A (en) * 1966-11-04 1970-11-17 Cit Alcatel Composite antenna
GB2165097A (en) * 1982-05-18 1986-04-03 Siemens Ag Biconical antennae

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JPS60149204A (en) * 1984-01-13 1985-08-06 Toyota Motor Corp Double frequency sharing antenna for car

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GB807961A (en) * 1956-03-16 1959-01-28 Belling & Lee Ltd Improvements in aerials
US3541556A (en) * 1966-11-04 1970-11-17 Cit Alcatel Composite antenna
GB2165097A (en) * 1982-05-18 1986-04-03 Siemens Ag Biconical antennae

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Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 315 (E-365)[2038], 11 décembre 1985; & JP-A-60 149 204 (TOYOTA JIDOSHA K.K.) 06-08-1985 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032359A1 (en) * 1996-02-27 1997-09-04 Thomson Consumer Electronics, Inc. Folded bow-tie antenna
US6054963A (en) * 1996-02-27 2000-04-25 Thomson Licensing S.A. Folded bow-tie antenna
WO2004027929A1 (en) * 2002-09-16 2004-04-01 Kathrein-Werke Kg Antenna assembly comprising a surface dipole
US7138954B2 (en) 2002-09-16 2006-11-21 Kathrein-Werke Kg Antenna assembly comprising a surface dipole

Also Published As

Publication number Publication date
FR2602097A1 (en) 1988-01-29
EP0254373B1 (en) 1991-06-05
FR2602097B1 (en) 1988-10-21
JPS6340401A (en) 1988-02-20
DE3770533D1 (en) 1991-07-11

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