CN103337678B - There is the cross-couplings substrate integral wave guide filter of steep side band characteristic - Google Patents
There is the cross-couplings substrate integral wave guide filter of steep side band characteristic Download PDFInfo
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- CN103337678B CN103337678B CN201310264125.0A CN201310264125A CN103337678B CN 103337678 B CN103337678 B CN 103337678B CN 201310264125 A CN201310264125 A CN 201310264125A CN 103337678 B CN103337678 B CN 103337678B
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Abstract
The invention discloses a kind of cross-couplings substrate integral wave guide filter with steep side band characteristic, by introducing cross-couplings extra between non-conterminous cavity, can forming transmission zero in the very near stopband range of passband, these transmission zeros are very effective to the sideband transient characteristic and Out-of-band rejection characteristic that improve filter, make filter have good selectivity, so improve that traditional main mould direct-coupling SIW rectangular cavity filter lower sideband is asymmetric, upper sideband transient characteristic relaxes, the shortcoming of poor selectivity.The present invention is simple, and bandwidth of operation is larger.This filter uses individual layer pcb board to realize simultaneously, has modeling simple, has that Insertion Loss is little, lower sideband transient characteristic is precipitous, stop band attenuation increases, processing cost is low at high band and is easy to the advantage such as integrated.
Description
Technical field
The present invention relates to a kind of X-band filter, specifically a kind of cross-couplings substrate integral wave guide filter with steep side band characteristic, this filter uses substrate integrated wave guide structure, extra cross-couplings is introduced between non-conterminous resonant cavity, thus transmission zero is formed in the stopband near passband, make lower sideband transient characteristic precipitous, the application scenario being specially adapted to higher frequency band, low-loss, high integration and having higher requirements to selectivity.
Background technology
Filter is one of assembly important in Circuits System, is extensively applied in the systems such as communication, radar.High performance filter can reduce the noise factor of system, and the band reducing system disturbs outward, improves the sensitivity etc. of receiving system, thus improves the performance of radio system greatly.
In order to the radio communication service adapting to increase fast is to the requirement of frequency spectrum resource, wireless communication frequency starts from low-frequency range gradually to high band even millimeter wave frequency band expansion.Therefore, the research of high integration low cost radio frequency circuit is carried out for microwave and millimeter wave frequency range significant.
Often use based on metal waveguide structure filter in microwave circuit, and based on the filter of microstrip line, complanar line structure.Metal waveguide structure filter is widely used in various microwave and millimeter wave system, especially in fields such as military communication, radar and satellite communications due to its characteristic such as high q-factor and high power capacity always.But this filter is bulky, processing technology and debug process complexity, and be not easy with other planar circuits integrated, thus considerably increase system cost.On the other hand, microstrip structure filter can realize in the plane, is also easy to integrated with other planar circuits, but in this kind of circuit, electromagnetic leakage and radiation are comparatively serious, and loss is comparatively large, and Q value is lower, and especially in high band, these shortcomings are more obvious.Therefore, tradition is applied to the circuit engineering (metal waveguide, microstrip line etc.) of design microwave passive component
[1]can not adapt to Modern wireless communication completely to microwave device miniaturization, low cost, integrated requirement
[2].
In order to solve the defect of metal waveguide structure and microstrip line construction, propose a kind of novel guided wave structure formed---substrate integration wave-guide (Substrate Integrated Waveguide, SIW), it by upper and lower surface be metal level low loss dielectric substrate on embed two row parallelization holes form
[3].Its propagation characteristic and rectangular waveguide similar, so the microwave component be made up of it has high q-factor.Simultaneously, substrate integration wave-guide can adopt traditional printed circuit board (PCB) (PCB) technology and the planar transmission such as microstrip line, co-planar waveguide line circuit to be integrated on same dielectric substrate, thus there is higher integrated level, have in addition lightweight, without the advantage such as obvious radiation, Insertion Loss be little, be specially adapted in higher frequency band, design high performance filter.
Substantially based on main mould rectangular cavity and the design of circular resonant chamber, (main mould: the mode of resonance that single cavity resonant frequency is minimum, for SIW cavity, i.e. TE in traditional substrate integral wave guide filter design
101pattern).
Traditional rectangular cavity SIW filter often adopts coaxial layout type.This layout type modeling is simple, utilizes its symmetry during emulation, and actual amount of calculation decreases half.But its selectivity is poor, be usually expressed as upper sideband transient characteristic slow, and lower sideband is functional, in obvious asymmetry, what this shortcoming was serious have impact on its practical value
[3].
Traditional circular resonant chamber SIW filter, layout type is flexible, and in the various shape cavity of planar circuit, circular cavity has the highest Q-unloaded.But its modeling is complicated, adds difficulty to design of Simulation.
List of references
[1] Xue Liangjin. millimeter wave engineering foundation. publishing house of Harbin Institute of Technology, 2004.
[2] Zhang Sheng, Wang Zihua, Xiao Jiankang, Li Ying. based on the bimodule band-pass filter of substrate integration wave-guide (SIW). microwave journal .2007 April
[3] soup Red Army. front ends of millimeter waves Research of Integration [D]. Southeast China University's thesis for the doctorate, 2006.
Summary of the invention
Goal of the invention: propose a kind of cross-couplings substrate integral wave guide filter with steep side band characteristic.By introducing cross-couplings (Cross-Coupled) extra between non-conterminous cavity, can forming transmission zero in the very near stopband range of passband, these transmission zeros are very effective to the sideband transient characteristic and Out-of-band rejection characteristic that improve filter, make filter have good selectivity, so improve that traditional main mould direct-coupling SIW rectangular cavity filter lower sideband is asymmetric, upper sideband transient characteristic relaxes, the shortcoming of poor selectivity.
The invention provides a kind of simple, the high-frequency band filter mentality of designing that bandwidth of operation is larger.This filter uses individual layer pcb board to realize, and has modeling simple, has that Insertion Loss is little, lower sideband transient characteristic is precipitous, stop band attenuation increases, processing cost is low at high band and is easy to the advantage such as integrated.
Technical scheme: a kind of cross-couplings substrate integral wave guide filter with steep side band characteristic is a kind of good lower sideband optionally cross-couplings substrate integral wave guide filter.Mainly based on substrate integrated waveguide technology and cross-coupling technique, be highly suitable for high band millimeter wave frequency band design high performance filter even.
The present invention adopts following technical scheme:
This cross-couplings substrate integral wave guide filter is TE by three main moulds
101mode of resonance rectangular cavity and a main mould are TE
201(there is TE in mode of resonance simultaneously
101, TE
201, TE
301pattern) super large resonant cavity composition, each resonant cavity provides a limit.In order to make filter sideband transient characteristic more precipitous, adopt cross-coupling technique: to be formed by inductive coupled window direct-coupling by resonant cavity and be just coupled; Be TE by main mould
201coupling in the super large resonant cavity of mode of resonance between each mode of resonance, forms negative coupling.By cross-couplings each other, forming transmission zero in the very near stopband range of passband, sideband transient characteristic and the Out-of-band rejection characteristic of filter can be improved, the selectivity of filter improved.
This filter, adopts substrate integrated waveguide technology, comprises dielectric substrate and lays respectively at upper surface metallic copper, the lower surface metal copper of upper and lower surface of dielectric substrate; Surrounding by the plated-through hole array running through upper and lower surface the main mould connected successively is TE101 pattern first rectangular cavity, the second rectangular cavity and the 3rd rectangular cavity; In order to form transmission zero near pass-band, surrounding one by the plated-through hole array running through upper and lower surface is positioned at above first, second, third resonant cavity, main mould is the super large resonant cavity (the 4th rectangular cavity) of TE201, and super large resonant cavity is connected with the 3rd resonant cavity with the first resonant cavity; The right side of the first rectangular cavity overlaps with on the left of the second rectangular cavity, and is provided with the first coupling window in the center of sidewall; The right side of the second rectangular cavity overlaps with on the left of the 3rd rectangular cavity, and is provided with the second coupling window in the center of sidewall; The intersection of the upside of first and third rectangular cavity and the downside of the 4th rectangular cavity is provided with the 3rd, the 4th coupling window; Be provided with co-planar waveguide input in center, the left side of the first rectangular cavity, on the right side of the 3rd rectangular cavity, center is provided with co-planar waveguide output; Whole filter construction is central shaft specular.
Plated-through hole diameter d: 0.5mm.
Plated-through hole pitch of holes is p:0.85mm.
Beneficial effect: compared with prior art, tool of the present invention has the following advantages:
1. this filter is by the cross-couplings between cavity, transmission zero is formed near pass-band, thus improve conventional substrate integrated waveguide main mould rectangular cavities filter lower sideband transiting performance mitigation (especially upper sideband), make its sideband transient characteristic precipitous, Out-of-band rejection increases;
2. this filter has less Insertion Loss, adopts high order cavity structure, compared to main die cavity fluid filter, further can reduce loss;
3. this filter adopts rectangular cavity body structure, and whole filter model is central shaft specular, and simulation modeling is simple;
4. this filter adopts single substrate integrated wave guide structure, ripe single-layer printed circuit plate technique (PCB) can be utilized, realization is simple and precision is high, and being easy to integrated with active planar circuit, is more competitive Engineering applications of microwave and millimeter waves technology compared to traditional metal waveguide filter;
5. this filter is using substrate integration wave-guide as resonator, and circuit structure is closed, and essentially eliminates radiation leakage, and therefore its loss is well below based on micro-band or complanar line filter, is highly suitable at high band even millimere-wave band design high performance filter.
Accompanying drawing explanation
Fig. 1 (a) is the present invention's single substrate integration wave-guide rectangular cavities planar structure schematic diagram;
Fig. 1 (b) is the present invention's single substrate integration wave-guide rectangular cavities side structure schematic diagram;
Fig. 2 is embodiment of the present invention filter planar structure schematic diagram;
Fig. 3 be embodiment of the present invention filter signal transmission path open up complement;
Fig. 4 is embodiment of the present invention filter primary magnetic field distribution map;
Fig. 5 is the transmission characteristic figure of embodiment of the present invention filter.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
This cross-couplings substrate integral wave guide filter structure, as shown in Fig. 1 (a), 1 (b), Fig. 2, is TE by three main moulds
101mode of resonance rectangular cavity and a main mould are TE
201(there is TE in mode of resonance simultaneously
101, TE
201, TE
301pattern) super large resonant cavity composition.This filter adopts substrate integrated waveguide technology, comprises dielectric substrate 1 and lays respectively at upper surface metallic copper 21, the lower surface metal copper 22 of upper and lower surface of dielectric substrate 1; Surrounding by the plated-through hole array 3 running through upper and lower surface the main mould connected successively is TE
101pattern first rectangular cavity 51, second rectangular cavity 52 and the 3rd rectangular cavity 53; In order to form transmission zero near pass-band, surround one by the plated-through hole array 3 running through upper and lower surface and be positioned at above the first rectangular cavity 51, second rectangular cavity 52 and the 3rd rectangular cavity 53, main mould is TE
201super large resonant cavity (the 4th rectangular cavity) 54, and be connected with the 3rd rectangular cavity 53 with the first rectangular cavity 51; The right side of the first rectangular cavity 51 overlaps with on the left of the second rectangular cavity 52, and is provided with the first coupling window 61 in the center of sidewall; The right side of the second rectangular cavity 52 overlaps with on the left of the 3rd rectangular cavity 53, and is provided with the second coupling window 62 in the center of sidewall; The intersection of the upside of the first rectangular cavity 51, the 3rd rectangular cavity 53 and the downside of the 4th rectangular cavity 54 is provided with the 3rd coupling window 63, the 4th coupling window 64; Be provided with co-planar waveguide input 71 in center, the left side of the first rectangular cavity 51, on the right side of the 3rd rectangular cavity 53, center is provided with co-planar waveguide output 72; Whole filter construction is central shaft specular.
The every single resonant cavity of this filter provides a limit.In order to make the sideband transient characteristic of filter more precipitous, between non-conterminous cavity, introduce cross-coupling technique.Concrete cross-couplings execution mode is as follows: described filter signal transmission path as shown in Figure 3.The main signal transmission path of this filter is 1. source-cavity 1(first rectangular cavity 51)-cavity 2(second rectangular cavity 52)-cavity 3(the 3rd rectangular cavity 53) (cavity 1,2,3 is all based on TE in-load
101mode of resonance); 2. source-cavity 1-cavity 4(the 4th rectangular cavity 54)-(cavity 4 is based on TE in cavity 3-load
201mode of resonance).Distribution of Magnetic Field figure in filter as shown in Figure 4.1. transmission path is formed and is just coupled, and 2. transmission path forms negative coupling, as shown in Figure 3, therefore at TE
201a transmission zero can be produced between resonance frequency and passband.Meanwhile, the TE existed in cavity 4
1013. pattern spurious response define a new signal transmission path between source and load: source-cavity 1-cavity 4(is based on TE
101mode of resonance)-cavity 3-load.What 3. path was formed be just coupled, and 2. formed with path negative is coupling in TE
101second transmission zero is formed, as shown in Figure 3 between resonance frequency and passband; In like manner, the spurious response TE existed in cavity 4
301a new transmission path is defined 4.: source-cavity 1-cavity 4(is based on TE between source and load
301mode of resonance)-cavity 3-load.What 4. path was formed be just coupled, and 2. formed with path negative is coupling in passband and TE
301a transmission zero is formed again, as shown in Figure 3 between resonance frequency.Transmission path, can forming transmission zero by cross-couplings each other in the very near stopband range of passband, and these zero points, to the sideband transient characteristic and the Out-of-band rejection characteristic that improve filter, make the selectivity of filter improve.
The design pictorial diagram of filter as shown in Figure 4.Whole filter is central shaft specular by four cavitys.Filter have employed ripe printed circuit board (PCB) (PCB) technique, is 2.2 at dielectric constant, thickness be 0.508mm Rogers5880 dielectric substrate 1 on be made.Each geometric parameter values in example is as shown in the table:
As shown in Figure 5, wherein dotted line is simulation result to the transmission characteristic of filter, and solid line is test result, and simulate and test result is coincide good.Actual measurement filter centre frequency is 12GHz, and three dB bandwidth is about 1GHz, and return loss is better than-15.6dB, and insertion loss is 1.3dB.This loss comprises the impact of the splicing loss of high frequency fixture and microstrip line, deducts this part loss, and the insertion loss of filter will be less.Three transmission zeros that this filter is produced by cross-couplings make its selectivity good, lower sideband transient characteristic is similar to quasi-elliptic filters sideband transition nature, upper sideband transiting performance is precipitous, the application scenario being highly suitable for higher frequency band, low-loss, high integration and having higher requirements to selectivity.
Claims (3)
1. there is a cross-couplings substrate integral wave guide filter for steep side band characteristic, it is characterized in that: comprising three main moulds is TE
101mode of resonance rectangular cavity and a main mould are TE
201a super large resonant cavity of mode of resonance, be called the first rectangular cavity, the second rectangular cavity, the 3rd rectangular cavity and the 4th rectangular cavity successively, each resonant cavity provides a limit; First rectangular cavity, the second rectangular cavity, the 3rd rectangular cavity are formed by inductive coupled window direct-coupling and are just coupled; TE in first rectangular cavity, the 3rd rectangular cavity and the 4th rectangular cavity
101and TE
301coupling between pattern is formed and is just coupled; TE in first rectangular cavity, the 4th rectangular cavity
201being coupled between pattern with the 3rd rectangular cavity, forms negative coupling.
2. there is the cross-couplings substrate integral wave guide filter of steep side band characteristic as claimed in claim 1, it is characterized in that: described filter comprises dielectric substrate and is located at the upper surface metallic copper of dielectric substrate upper and lower surface, lower surface metal copper respectively; Surrounding by the plated-through hole array running through upper and lower surface the main mould connected successively is TE
101pattern first rectangular cavity, the second rectangular cavity and the 3rd rectangular cavity; In order to form transmission zero near pass-band, surround one by the plated-through hole array running through upper and lower surface and be positioned at above first, second, third resonant cavity, main mould is TE
201super large resonant cavity, i.e. the 4th rectangular cavity, super large resonant cavity is connected with the 3rd rectangular cavity with the first rectangular cavity; The right side of the first rectangular cavity overlaps with on the left of the second rectangular cavity, and is provided with the first coupling window in the center of sidewall; The right side of the second rectangular cavity overlaps with on the left of the 3rd rectangular cavity, and is provided with the second coupling window in the center of sidewall; The intersection of the upside of the first rectangular cavity, the 3rd rectangular cavity and the downside of the 4th rectangular cavity is provided with the 3rd coupling window, the 4th coupling window; Be provided with co-planar waveguide input in center, the left side of the first rectangular cavity, on the right side of the 3rd rectangular cavity, center is provided with co-planar waveguide output; Whole filter construction is central shaft specular.
3. there is the cross-couplings substrate integral wave guide filter of steep side band characteristic as claimed in claim 2, it is characterized in that: described filter uses individual layer pcb board to realize, and wherein, plated-through hole diameter d is: 0.5mm; Plated-through hole pitch of holes p is: 0.85mm.
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| CN110581335B (en) * | 2019-08-16 | 2021-06-08 | 南京理工大学 | Sequential feed power distribution network based on substrate integrated waveguide |
| CN113328223B (en) * | 2021-06-29 | 2022-08-30 | 展讯通信（上海）有限公司 | Third-order band-pass filter |
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| Cross-Coupled Substrate Integrated Waveguide Filters With Improved Stopband Performance;Fang Zhu等;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20121231;第22卷(第12期);全文 * |
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