CN204680736U - Ultra broadband THz wave ripple filter - Google Patents
Ultra broadband THz wave ripple filter Download PDFInfo
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Abstract
The utility model discloses ultra broadband THz wave ripple filter, described filter comprises: standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, waveguide short detail, resonance wave guide cavity, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connects to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering, described filter about the horizontal central line of described filter and vertical center line all symmetrical, achieving can at the ultra broadband filter function of Terahertz frequency range, processing is simple, Stability Analysis of Structures, the technique effect that alignment error is less.
Description
Technical field
The utility model relates to waveguide filter research field, particularly relates to ultra broadband THz wave ripple filter.
Background technology
Along with the development of super-broadband tech, ultra-wide band filter also becomes more and more important, also more and more higher to the requirement of ultra-wide band filter, new technology, the appearance of new technology makes the design theory of ultra-wide band filter also enrich constantly and perfect, but the development of ultra-wide band filter structure mainly concentrates on microstrip line at present, in suspended mictrostrip and co-planar waveguide, these structures are mainly used in low-frequency range or microwave, millimeter wave frequency band, after communications band is raised to Terahertz frequency range, these structures will be selected few in the face of such as project organization, difficult processing, low and the object test result of machining accuracy worsens a series of problems such as serious, therefore waveguide element design is mainly used at the filter of high-frequency band, such as E face Mental Septum Waveguide Filter, H face inductance diaphragm filter, Fin-line Filter etc., these waveguide filter simplicity of design, easy to process, easy batch production and there is the advantages such as higher Q value and good filtering characteristic and obtain a wide range of applications at millimeter wave frequency band, but in Terahertz frequency range because wavelength becomes very short, every size of above-mentioned form filter can become very little, cause object construction unstable, alignment error is larger, and domestic machining accuracy cannot meet the demand of design, the more important thing is that above-mentioned waveguiding structure is wanted to accomplish that ultra broadband is very difficult.
Along with the develop rapidly of wireless communication technology and wireless multimedia service, ultra broadband (UWB) technology receives the concern of more and more researcher, ultra broadband, with advantages such as its two-forty, low-power consumption, high security and antijamming capability are strong, has boundless application prospect and quite huge market value.Although US military and aeronautical chart are had different views for civilian still the also existing of open ultra wideband frequency, but due to the tempting application prospect that super-broadband tech is potential, US Federal Communication Committee (FCC) have approved the application of super-broadband tech in short-distance wireless communication field in February, 2002.This commercial applications being super-broadband tech product opens gate, facilitates radio ultra wide band system and device progress of research thereof.Because super-broadband tech field applicatory is very extensive, for the ease of management, radio ultra wide band system is divided three classes by FCC: one is imaging system, comprises ground-penetrating radar system, wall imaging system, wall penetrate imaging system, surveillance and medical imaging system; Two is Vehicular radar systems; Three is indoor ultra-broadband systems.
The main method of ultra-wide band filter design both at home and abroad has at present:
1. micro-band multimode resonator method
So-called multimode resonator refers to the resonator having multiple mode of resonance in passband.Multimode resonator has a variety of form, what be wherein applied to ultra-wide band filter the earliest is half-wavelength step impedance resonator (SIR), its principle utilizes SIR impedance ratio and electrical length to control fundamental frequency and harmonic, multiple resonance points of resonator are made to be distributed in whole ultra broadband, then by parallel coupled line feed, smooth ultra broadband characteristic is realized.
2. hybrid microstrip/co-planar waveguide method
Micro-band and co-planar waveguide mixed structure can make full use of upper and lower two sheaf spaces of microstrip line, make circuit compacter, simultaneously, the ground roll correcting pair together of micro-band, electromagnetic field couples is between the two very strong, the close coupling required for can conveniently realizing, common mixed structure is microstrip-fed co-planar waveguide resonator ultra-wide band filter, circuit adopts microstrip feed line, the negative coupling in the source that simultaneously introduces, thus produces multiple zero point at upper and lower stopband.Broadside coupled structure produces multiple limit in passband, and filter passband internal reflection loss is reduced.The gap width of co-planar waveguide affects line characteristic impedance, thus can be used to the impedance changing coupling line, controls the position of each resonance peak of resonator.
3. filter stage linked method
Filter concatenation technology realizes the comparatively simple and efficient method of ultra broadband.By a high pass filter and a low pass filter series connection, realize ultra broadband characteristic.The circuit that this method realizes is simple, and Measures compare is directly perceived, and the filter stop bend simultaneously realized is wider.
But above-mentioned three kinds of structures comparing main flow are no longer practical when frequency range rises to millimeter wave and even Terahertz frequency range, but use waveguide element instead and realize filter characteristic, wherein most widely used is that metallic membrane inserts waveguide, pure cavity waveguide, fin line inserts the filter constructions such as waveguide, the filter of these Structure composing is all realize corresponding inductive reactive element by introducing discontinuous construction in waveguide, and carry out cascade to realize filter function with the resonant cavity of corresponding band, such as E face Mental Septum Waveguide Filter is exactly insert metallic membrane in wide central authorities of standard waveguide, filter function is realized by the coupling between the multiple resonant cavity of the cut to lengthen of metallic membrane, but the metallic membrane that this slip-on filter inserts faced by high-frequency band meeting or substrate can become very little, and a series of problems such as easy deformation.
Existing ultra-wide band filter structure is mainly applied in the design of low frequency frequency range, its structure is not easily processed at high band, rigging error is large, requirement on machining accuracy is too high, the waveguide filter structure being present in high-frequency band much also has above-mentioned problem, such as existing E face Mental Septum Waveguide Filter can become very little along with the size of the raised metal diaphragm of frequency, particularly the first order metallic membrane length of metallic membrane reduces more violent, in high-frequency band, first order metallic membrane length is too short not easily processes, yielding fracture in kind, and insert type waveguide filter structure can cause the deterioration of insertion loss because there is current drain element in cavity.
In sum, the application's utility model people, in the process realizing utility model technical scheme in the embodiment of the present application, finds that above-mentioned technology at least exists following technical problem:
In the prior art, it is comparatively large to there is structural instability, alignment error in existing ultra broadband THz wave waveguide filter, not easily processes requirement on machining accuracy higher, the more difficult technical problem realizing ultra broadband.
Utility model content
The utility model provides a kind of ultra broadband THz wave ripple filter, solve that existing ultra broadband THz wave waveguide filter exists structural instability, alignment error is larger, not easily process, requirement on machining accuracy is higher, the more difficult technical problem realizing ultra broadband, achieving can at the ultra broadband filter function of Terahertz frequency range, and processing is simple, Stability Analysis of Structures, the technique effect that alignment error is less.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of ultra broadband THz wave ripple filter, and described filter comprises:
Standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, waveguide short detail, resonance wave guide cavity, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connect to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering, described filter about the horizontal central line of described filter and vertical center line all symmetrical.
Wherein, described N number of waveguide short detail be connected in parallel described in subtract in high waveguide.
Wherein, the width of described resonance wave guide cavity is consistent with the described width subtracting high waveguide.
Wherein, the waveguide short detail that in high waveguide, both sides are symmetrical mutually that subtracts of described filter left end forms a slow wave unit, the waveguide short detail that in high waveguide, both sides are symmetrical mutually that subtracts of described filter right-hand member forms another slow wave unit, and described 2 slow waves are unit cascaded and symmetrical mutually.
Wherein, in described each slow wave unit, between N number of waveguide short detail, spacing is equal, and spacing is 0.12mm.
Wherein, the length of described resonance wave guide cavity is 0.7mm, the described narrow edge lengths subtracting high waveguide is 0.3mm, standard rectangular Narrow Wall of Waveguide edge lengths is b0=0.356mm, the narrow edge lengths subtracting high waveguide is b1=0.3mm, the narrow edge lengths of short branch is b2=0.2mm, standard rectangular waveguide length is (this length can change) L0=1mm, subtracting high matching of waveguide length is L1=0.6mm, the length of resonance wave guide cavity is L2=0.7mm, arc tapered waveguide arc radius is r0=0.17mm, short branch chamfer radius is r2=0.1mm, spacing between short branch is w=0.12mm, the length of short branch is h=0.6mm.
Wherein, described standard rectangular waveguide, described arc tapered waveguide, described in subtract high waveguide, described waveguide short detail, described resonance wave guide cavity be cavity body structure.
Wherein, described waveguide short detail is distributed in waveguide H face, adds and is parallel to the incision of E face man-hour, and H face refers to the face being parallel to magnetic field in the main mould TE10 pattern of transmission in standard rectangular waveguide, and E face refers to the face being parallel to electric field in the main mould TE10 pattern of transmission; Narrow limit is E face width limit is specifically H face.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
Owing to have employed, ultra broadband THz wave ripple filter is designed to comprise: standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, waveguide short detail, resonance wave guide cavity, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connects to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering, the horizontal central line of described filter about described filter and the technical scheme of the equal symmetry of vertical center line, namely pure cavity body structure is adopted to carry out designing filter and the ripple filter realized by short branch formation slow wave structure, filter is made to have the bandwidth of ultra-wide by regulating short circuit minor matters, bandwidth can reach 70GHz, pure cavity body filter does not need to add extra structure, install simpler, and it is also lower to the required precision of processing, domestic existing process technology can realize, owing to there is not metal structure in cavity, field energy consumes lower when passing through, therefore filter has the interior Insertion Loss of well band, compared to existing technology, this utility model can be applied to higher frequency range, compared to existing technology, this programme processing is convenient, assembling is simple, adopt on waveguide H face, add short branch formation slow wave structure, add and can cut from E face man-hour, mismachining tolerance impact is less, so, efficiently solve existing ultra broadband THz wave ripple filter and there is structural instability, alignment error is larger, not easily process, requirement on machining accuracy is higher, the more difficult technical problem realizing ultra broadband, and then achieve can at the ultra broadband filter function of Terahertz frequency range, processing is simple, Stability Analysis of Structures, the technique effect that alignment error is less.
Accompanying drawing explanation
Fig. 1 is the integrated circuit schematic diagram of ultra broadband THz wave ripple filter in the embodiment of the present application one;
Fig. 2 is the structural representation of ultra broadband THz wave ripple filter in the embodiment of the present application one;
Fig. 3 is single slow wave cellular construction and Electric Field Distribution schematic diagram thereof in the embodiment of the present application one;
Fig. 4 is the simulation result schematic diagram of single slow wave structure in the embodiment of the present application one;
Fig. 5 is the simulation result schematic diagram of two each and every one slow wave structures in the embodiment of the present application one;
Wherein, the waveguide of 1-standard rectangular, 2-arc tapered waveguide, 3-subtracts high waveguide, 4-6,9-11 waveguide short detail, 7-resonance wave guide cavity, 8-chamfering.
Embodiment
The utility model provides a kind of ultra broadband THz wave ripple filter, solve that existing ultra broadband THz wave ripple filter exists structural instability, alignment error is larger, not easily process, requirement on machining accuracy is higher, the more difficult technical problem realizing ultra broadband, achieving can at the ultra broadband filter function of Terahertz frequency range, and processing is simple, Stability Analysis of Structures, the technique effect that alignment error is less.
Technical scheme during the application implements is for solving the problems of the technologies described above.General thought is as follows:
Have employed and ultra broadband THz wave ripple filter is designed to comprise: standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, waveguide short detail, resonance wave guide cavity, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connects to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering, the horizontal central line of described filter about described filter and the technical scheme of the equal symmetry of vertical center line, namely pure cavity body structure is adopted to carry out designing filter and the ripple filter realized by short branch formation slow wave structure, filter is made to have the bandwidth of ultra-wide by regulating short circuit minor matters, bandwidth can reach 70GHz, pure cavity body filter does not need to add extra structure, install simpler, and it is also lower to the required precision of processing, domestic existing process technology can realize, owing to there is not metal structure in cavity, field energy consumes lower when passing through, therefore filter has the interior Insertion Loss of well band, compared to existing technology, this utility model can be applied to higher frequency range, compared to existing technology, this programme processing is convenient, assembling is simple, adopt on waveguide H face, add short branch formation slow wave structure, add and can cut from E face man-hour, mismachining tolerance impact is less, so, efficiently solve existing ultra broadband THz wave waveguide filter and there is structural instability, alignment error is larger, not easily process, requirement on machining accuracy is higher, the more difficult technical problem realizing ultra broadband, and then achieve can at the ultra broadband filter function of Terahertz frequency range, processing is simple, Stability Analysis of Structures, the technique effect that alignment error is less.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete execution mode, technique scheme is described in detail.
Embodiment one:
In embodiment one, provide a kind of ultra broadband THz wave ripple filter, please refer to Fig. 1-Fig. 5, described filter comprises:
Standard rectangular waveguide 1, arc tapered waveguide 2, subtract high waveguide 3, waveguide short detail 4-6 and 9-11, resonance wave guide cavity 7, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connect to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering 8, described filter about the horizontal central line of described filter and vertical center line all symmetrical.
Wherein, in the embodiment of the present application, described N number of waveguide short detail be connected in parallel described in subtract in high waveguide; The object of such design is: electric field is entering short branch by electric field during each detail and the change in direction occurs, become the electric field with former E-field normal, electric field after change is propagated and is reflected back in main waveguide and continues to propagate in short branch, realizes filter function like this by the slow wave structure in series of N parallel detail.
Wherein, in the embodiment of the present application, the width of described resonance wave guide cavity is consistent with the described width subtracting high waveguide, because consistent width can make the processing of filter become easy.
Wherein, in the embodiment of the present application, the waveguide short detail that in high waveguide, both sides are symmetrical mutually that subtracts of described filter left end forms a slow wave unit, the waveguide short detail that in high waveguide, both sides are symmetrical mutually that subtracts of described filter right-hand member forms another slow wave unit, and described 2 slow waves are unit cascaded and symmetrical mutually.
Wherein, in the embodiment of the present application, in described each slow wave unit, between N number of waveguide short detail, spacing is equal, and spacing is 0.12mm; Because filter is symmetrical Two-port netwerk element, between short branch, filter construction equidistantly can be made more symmetrical, also make design convenient, simple, by consistent spacing, the electric field phase of each short branch of arrival is consistent.
Wherein, in the embodiment of the present application, the length of described resonance wave guide cavity is 0.7mm, the described narrow edge lengths subtracting high waveguide is 0.3mm, standard rectangular Narrow Wall of Waveguide edge lengths is b0=0.356mm, the narrow edge lengths subtracting high waveguide is b1=0.3mm, the narrow edge lengths of short branch is b2=0.2mm, standard rectangular waveguide length is (this length can change) L0=1mm, subtracting high matching of waveguide length is L1=0.6mm, the length of resonance wave guide cavity is L2=0.7mm, arc tapered waveguide arc radius is r0=0.17mm, short branch chamfer radius is r2=0.1mm, spacing between short branch is w=0.12mm, the length of short branch is h=0.6mm.
Wherein, in the embodiment of the present application, by designing and emulate every size that can obtain told filter, wherein, standard waveguide adopts narrow limit to be the frequency that b0=0.356mm carrys out conducting 260GHz to 400GHz; Length is that 0.7mm resonance wave guide cavity can make the resonance frequency of resonant cavity within the scope of 320-340GHz; The 0.3mm characteristic impedance that can increase rectangular waveguide less of the narrow limit of standard waveguide is got on the narrow limit subtracting high waveguide; The width on the narrow limit of short circuit minor matters and length are got 0.2mm and 0.6mm respectively and be ensure that the broadband character of filter and the position of centre frequency; The radius of arc tapered waveguide and chamfering is variable, gets 0.17mm and 0.1mm respectively and ensure that can to make processing more convenient, reduce the requirement of machining accuracy; Return loss in the distance adjustable band of short branch can in 0.12mm place return loss the best by optimization.
Wherein, finally reaching 0.1dB bandwidth is more than 70GHz, and return loss is less than-15dB in band, and high frequency treatment suppresses to reach 40dB at band outer 7% simultaneously, and low frequency is in the effect that outer 10% place of band suppresses to reach 45dB.
Wherein, in the embodiment of the present application, described standard rectangular waveguide, described arc tapered waveguide, described in subtract high waveguide, described waveguide short detail, described resonance wave guide cavity be cavity body structure; Wherein, quasi-retangular wave is led as WR-2.8; The progressive waveguide of arc tapered waveguide is realized by chamfering; Subtracting high duct width and the standard waveguide WR-2.8 narrow edge lengths of short branch that is consistent is 0.3mm, and its effect is to provide impedance matching to make the better feed-in of energy; Waveguide short detail is that one section of broadside and main body are consistent, and narrow limit is one section of empty waveguide of 0.2mm, is used for transmitting and reflected field; Resonance wave guide cavity is that interface dimensions is followed and subtracted the consistent empty waveguide cavity of high waveguide, plays the effect providing transmission electric field and provide resonance point.
Wherein, in the embodiment of the present application, described waveguide short detail is distributed in waveguide H face, adds and is parallel to the incision of E face man-hour, H face refers to the face being parallel to magnetic field in the main mould TE10 pattern of transmission in standard rectangular waveguide, and E face refers to the face being parallel to electric field in the main mould TE10 pattern of transmission; Narrow limit is E face width limit is specifically H face.
Wherein, in actual applications, below in conjunction with accompanying drawing and concrete example, the technical scheme in the application is described in detail:
This application provides a kind of ultra broadband THz wave ripple filter, comprise standard rectangular waveguide and waveguide short detail, be from left to right standard rectangular waveguide 1 successively, arc tapered waveguide 2, subtract high waveguide 3, waveguide short detail 4,5,6 and symmetrical detail, resonance wave guide cavity 7, chamfering 8; Its median filter is symmetrical, and before and after short branch, symmetry is distributed in both sides, Narrow Wall of Waveguide limit; Wherein standard rectangular waveguide mouth 1 standard rectangular waveguide WR-2.8 (0.711*0.356mm); Wherein arc tapered waveguide 2 connection standard rectangular waveguide 1 and subtract high waveguide 3; Wherein subtracting high waveguide 3 can regulate impedance matching that the energy of passband frequency range is better passed through, and the narrow edge lengths subtracting high waveguide is 0.3mm; Wherein waveguide short detail is distributed in waveguide H face, in parallel being connected to subtracts in high waveguide 3, symmetrical short branch forms discontinuous construction and may correspond to into reactance or inductance element, the cascade of multiple parallel connection short circuit detail can form slow wave structure thus have filtering characteristic, selects the cascade of 3 symmetrical details in this example; Wherein short branch 4,5,6 and symmetrical detail 9,10,11 thereof constitute a slow wave unit, and the short branch of each symmetry can introduce a resonance point to increase bandwidth; Wherein resonance wave guide cavity 7 is as the connection cavity of two slow wave structures, and the width on its narrow limit is consistent with subtracting high waveguide, and length is 0.7mm; Wherein chamfering 8 is the chamferings on short branch, can make processing more accurately (waveguide processing cannot process right angle) like this; Its median filter have employed two symmetrical slow wave cellular constructions and realizes, and the employing of multiple unit not only can be used for increasing bandwidth can also improve Out-of-band rejection performance; Wherein in each slow wave unit, short branch equidistantly distributes, and spacing is 0.12mm; Wherein short branch length can regulate the filtering characteristic of filter, and control centre's frequency within the specific limits; Every size of its median filter as shown in Figure 2, is respectively: b0=0.356mm, b1=0.3mm, b2=0.2mm, L0=1mm, L1=0.6mm, L2=0.7mm, r0=0.17mm, r2=0.1mm, w=0.12mm, h=0.6mm.
Filter in the application realizes filter function by the slow wave structure introducing short branch formation, short circuit minor matters are distributed in the H face of waveguide, the resonance point introduced by multiple short branch realizes the broadband character of filter, single slow wave unit as shown in Figure 3, it is made up of three symmetrical details, the length and width of each detail can regulate, be used for controlling Insertion Loss in bandwidth sum band, each detail can introduce the discontinuous construction of waveguide, these discontinuous constructions may correspond to reactance or inductive reactive element when analyzing, and its characteristic is determined by detail length; Can be there is the change in direction in electric field as shown in Figure 3 after entering the slow wave structure of short branch composition, become the electric field with former E-field normal, and the electric field after change is propagated and is reflected back in main waveguide and continues to propagate in short branch; Its Electric Field Distribution as shown in Figure 3; The simulation result of single slow wave unit as shown in Figure 4; Can find out that single slow wave structure has corresponding three the symmetrical short-circuit details of obvious 3 resonance points clearly by Fig. 4; The bandwidth of this filter is up to about 70GHz, and in-band insertion loss is less than 0.05dB, and this 0.2dB(material object comparing plug-in type waveguide filter worsens very serious) be greatly improved, especially in object test; But the Out-of-band rejection of single structure is poor.
After analyzing single slow wave structure, adopt the cascade of multiple unit to increase Out-of-band rejection degree, adopt the filter construction of two unit as shown in Figure 1, in order to the return loss performance of extra-high filter, have employed waveguide at the two ends of waveguide and subtract high mode to carry out impedance matching, its simulation result as shown in Figure 5.
The 0.1dB bandwidth of this filter is more than 70GHz as seen from Figure 5, return loss is less than-15dB in band, by the S curve of filter can find out the return loss of filter at peak time band in insertion loss change little, all control within 0.1dB, this illustrates owing to not having extra current drain element, its insertion loss has had raising, Out-of-band rejection also reaches good effect simultaneously, high frequency treatment suppresses to reach 40dB at band outer 7%, low frequency is in outer 10% place of band to be suppressed to reach 45dB, when comparing individual unit, Out-of-band rejection characteristic is greatly improved, cascade slow wave unit is more, its Out-of-band rejection performance is better.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
Owing to have employed, ultra broadband THz wave ripple filter is designed to comprise: standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, waveguide short detail, resonance wave guide cavity, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connects to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering, the horizontal central line of described filter about described filter and the technical scheme of the equal symmetry of vertical center line, namely pure cavity body structure is adopted to carry out designing filter and the ripple filter realized by short branch formation slow wave structure, filter is made to have the bandwidth of ultra-wide by regulating short circuit minor matters, bandwidth can reach 70GHz, pure cavity body filter does not need to add extra structure, install simpler, and it is also lower to the required precision of processing, domestic existing process technology can realize, owing to there is not metal structure in cavity, field energy consumes lower when passing through, therefore filter has the interior Insertion Loss of well band, compared to existing technology, this utility model can be applied to higher frequency range, compared to existing technology, this programme processing is convenient, assembling is simple, adopt on waveguide H face, add short branch formation slow wave structure, add and can cut from E face man-hour, mismachining tolerance impact is less, so, efficiently solve existing ultra broadband THz wave waveguide filter and there is structural instability, alignment error is larger, not easily process, requirement on machining accuracy is higher, the more difficult technical problem realizing ultra broadband, and then achieve can at the ultra broadband filter function of Terahertz frequency range, processing is simple, Stability Analysis of Structures, the technique effect that alignment error is less.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (8)
1. ultra broadband THz wave ripple filter, is characterized in that, described ultra broadband THz wave ripple filter comprises:
Standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, waveguide short detail, resonance wave guide cavity, wherein, standard rectangular waveguide, arc tapered waveguide, subtract high waveguide, resonance wave guide cavity, subtract high waveguide, arc tapered waveguide, standard rectangular waveguide from left to right connect to form described filter successively, describedly subtract high waveguide both sides and be equipped with N number of waveguide short detail, described N be more than or equal to 2 positive integer, described waveguide short detail end is provided with chamfering, described filter about the horizontal central line of described filter and vertical center line all symmetrical.
2. ultra broadband THz wave ripple filter according to claim 1, is characterized in that, subtracts in high waveguide described in described N number of waveguide short detail is connected in parallel.
3. ultra broadband THz wave ripple filter according to claim 1, is characterized in that, the width of described resonance wave guide cavity is consistent with the described width subtracting high waveguide.
4. ultra broadband THz wave ripple filter according to claim 1, it is characterized in that, the waveguide short detail that in high waveguide, both sides are symmetrical mutually that subtracts of described filter left end forms a slow wave unit, the waveguide short detail that in high waveguide, both sides are symmetrical mutually that subtracts of described filter right-hand member forms another slow wave unit, and described 2 slow waves are unit cascaded and symmetrical mutually.
5. ultra broadband THz wave ripple filter according to claim 4, is characterized in that, in described each slow wave unit, between N number of waveguide short detail, spacing is equal, and spacing is 0.12mm.
6. ultra broadband THz wave ripple filter according to claim 1, it is characterized in that, described standard rectangular Narrow Wall of Waveguide edge lengths is b0=0.356mm, the narrow edge lengths subtracting high waveguide is b1=0.3mm, the narrow edge lengths of short branch is b2=0.2mm, standard rectangular waveguide length is L0=1mm, subtracting high matching of waveguide length is L1=0.6mm, the length of resonance wave guide cavity is L2=0.7mm, arc tapered waveguide arc radius is r0=0.17mm, short branch chamfer radius is r2=0.1mm, spacing between short branch is w=0.12mm, the length of short branch is h=0.6mm.
7. ultra broadband THz wave ripple filter according to claim 1, is characterized in that, described standard rectangular waveguide, described arc tapered waveguide, described in subtract high waveguide, described waveguide short detail, described resonance wave guide cavity be cavity body structure.
8. ultra broadband THz wave ripple filter according to claim 1, it is characterized in that, described waveguide short detail is distributed in waveguide H face, add and be parallel to the incision of E face man-hour, H face refers to the face being parallel to magnetic field in the main mould TE10 pattern of transmission in standard rectangular waveguide, and E face refers to the face being parallel to electric field in the main mould TE10 pattern of transmission.
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| CN114497941A (en) * | 2022-04-18 | 2022-05-13 | 电子科技大学 | Terahertz waveguide filter based on dual-mode resonant cavity and design method thereof |
| CN115313003A (en) * | 2022-07-18 | 2022-11-08 | 电子科技大学长三角研究院(湖州) | Novel easily-machined terahertz dual-frequency band-pass filter with near-pass band |
| CN115377710A (en) * | 2022-09-17 | 2022-11-22 | 杭州摩光通讯器材有限公司 | Parallel stacked lightning arrester with short circuit structure |
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2015
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| CN115313003A (en) * | 2022-07-18 | 2022-11-08 | 电子科技大学长三角研究院(湖州) | Novel easily-machined terahertz dual-frequency band-pass filter with near-pass band |
| CN115313003B (en) * | 2022-07-18 | 2024-03-15 | 电子科技大学长三角研究院(湖州) | Novel easy-to-process terahertz dual-band pass filter with adjacent pass band |
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