CN103606725A - Parallel open-circuit stepped impedance low-pass filter - Google Patents
Parallel open-circuit stepped impedance low-pass filter Download PDFInfo
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Abstract
The invention discloses a parallel open-circuit stepped impedance low-pass filter which is suitable for low waveband signal filtering in a broadband frequency sweeping super-heterodyne spectrum analyzer. Firstly, a fifteen-order parallel open-circuit stepped impedance strip line elliptic function low-pass filtering unit is constructed based on a microwave sheet material and used for meeting the requirement for filtering a low-frequency signal; secondly, a eleven-order parallel open-circuit stepped impedance strip line elliptic function low-pass filtering unit is constructed based on the microwave sheet material and used for meeting the requirement for filtering a high-frequency signal; thirdly, the fifteen-order parallel open-circuit stepped impedance strip line elliptic function filtering unit and the eleven-order parallel open-circuit stepped impedance strip line elliptic function filtering unit are cascaded to form a twenty-six-order strip line low-pass filtering module. The twenty-six-order strip line low-pass filtering module is used for meeting the requirements for filtering the high-frequency signal and the low-frequency signal. The defects that a coaxial cavity low-pass filter is large in size, and port matching is not prone to being improved are overcome, besides, high-quality signal output is achieved, the product size is shrunk and power consumption is reduced.
Description
Technical field
The present invention relates to frequency sweep superhet spectrum analyzer field, broadband, relate in particular to a kind of open circuit stepped impedance low pass filter in parallel.
Background technology
In the frequency sweep superhet spectrum analyzer of typical broadband, broadband rf signal is divided into high and low different wave band by frequency.The radiofrequency signal of different-waveband finally all becomes respectively Low Medium Frequency signal after different frequency translations, so that analog to digital converter is sampled.Low band radio frequency signal frequency generally covers S-band, i.e. 0Hz-4GHz.Low band radiofrequency signal enters in spectrum analyzer and first passes through 4GHz low pass filter, then in the first frequency converter, carries out frequency conversion with the first local oscillation signal being operated under sweep method, obtains the first intermediate-freuqncy signal, according to formula 1.
F
lO-F
rF=F
iF(formula 1)
In formula 1, F
lO, F
rFand F
iFthe frequency that represents respectively local oscillator, radio frequency and intermediate-freuqncy signal.For frequency sweep superhet spectrum analyzer, the first intermediate-freuqncy signal frequency is fixed, frequently.For radio frequency signal frequency, be DC-4GHz, the first intermediate-freuqncy signal frequency is generally 5GHz left and right.
To the General Requirements of 4GHz low pass filter, be: passband insertion loss is little, passband echo coefficient is little, the transition band speed of roll-offing is high, and stopband Out-of-band rejection is large.Typical index request is: 0Hz-4GHz passband insertion loss is less than 2.5dB, be less than-18dB of passband echo coefficient, and the transition band of 4GHz-5GHz is roll-offed and is greater than 80dB, and the stopband of 5GHz-14GHz suppresses to be greater than 80dB.
The following two schemes of main employing is realized
Coaxial cavity low pass filter scheme
For reaching high index request, at present typical 4GHz low pass filter is to adopt coaxial cavity structure, and such as the metallic cavity that coaxial cavity low pass filter is surface gold-plating, two ends use coaxial connector as the interface with external module.The size of this filter increases along with the raising of Out-of-band rejection ability, such as suppressing for realizing the stopband of 80dB.
Known, this cavity low pass filter can be realized very high Out-of-band rejection.Yet this cavity low pass filter size is larger, and in use will be connected with external circuit module with half steel cable, the port match that this is unfavorable between improvement and external module, also cannot realize the miniaturization of instrument.
Planar transmission line low pass filter scheme based on microwave sheet material
For overcome the size of coaxial cavity low pass filter large, be difficult for improving the shortcomings such as port match, generally adopted the planar transmission line low pass filter based on microwave sheet material to substitute at present.
Such as microstrip line low pass filter is that RO4350 microwave sheet material based on ROGERS CORPORATION is realized, this filter main body is that length is the microstrip line construction of 5cm.Compare with coaxial cavity low pass filter, size obviously reduces.This microstrip line low pass filter can conveniently be integrated in another circuit module, has avoided coaxial-cable transition, is conducive to improve port match.Yet it is undesirable, known that the stopband of microstrip line low pass filter suppresses, in the stopband inhibition of 5GHz-14GHz, only have 60dB left and right, this is because microstrip line, because space radiation exists parasitic passband, is difficult to meet instrument demand.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of open circuit stepped impedance low pass filter in parallel, guaranteeing, under the prerequisite of high-quality output signal, to dwindle small product size, reduce power consumption, reduce assembling and the debugging work load of complete machine.
For solving the problems of the technologies described above, technical solution of the present invention comprises:
A kind of open circuit stepped impedance low pass filter in parallel, wherein, it comprises the 26 rank strip line low-pass filtering modules that are arranged between microwave sheet material central layer and prepreg, described 26 rank strip line low-pass filtering modules comprise for the treatment of 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter units of low frequency and ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit for the treatment of high frequency, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit and the cascade of described ten single order open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit, signal after described 26 rank strip line low-pass filtering modules are processed meets 0Hz-4GHz passband insertion loss and is less than 2.5dB, be less than-18dB of passband echo coefficient, the transition band of 4GHz-5GHz is roll-offed and is greater than 80dB, the stopband of 5GHz-14GHz suppresses to be greater than the condition of 80dB.
Described parallel connection open circuit stepped impedance low pass filter, wherein, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit comprises the first termination 50 ohm characteristic impedance stripline resonators, on described the first termination 50 ohm characteristic impedance stripline resonators, be in series with the first stripline resonator of eight same impedance, last first stripline resonator doubles as the public connecting end of described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit open circuit in parallel with described ten single orders stepped impedance strip line elliptic function low-pass filter unit cascade, between adjacent the first stripline resonator, all access one first and regulate stripline resonator, described first regulates stripline resonator to be comprised of the shorting stub of two open circuits, the signal of processing through described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit meets 4GHz passband insertion loss and is less than 2dB, be less than-18dB of passband echo coefficient, the transition band of the 4GHz-5GHz 100dB that roll-offs, the stopband of 5.5GHz-8GHz suppresses to be greater than the condition of 50dB.
Described parallel connection open circuit stepped impedance low pass filter, wherein, described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit comprises described public connecting end, on described public connecting end, be in series with the second stripline resonator of five same impedance, last second stripline resonator is connected with the second termination 50 ohm characteristic impedance stripline resonators, between described public connecting end and the second stripline resonator being connected, and between adjacent the second stripline resonator, all access two second and regulate stripline resonators, described second regulates stripline resonator to be comprised of the shorting stub of two open circuits, the signal of processing through described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit meets 4GHz passband insertion loss and is less than 0.5dB, be less than-18dB of passband echo coefficient, and the stopband of 8GHz-14GHz suppresses to be greater than the condition of 50dB.
A kind of open circuit stepped impedance low pass filter in parallel provided by the invention, adopt the cascade of 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit open circuit in parallel with ten single orders stepped impedance strip line elliptic function low-pass filter unit to form the technical scheme of 26 rank strip line low-pass filtering modules, realize 0Hz-4GHz passband insertion loss and be less than 2.5dB, be less than-18dB of passband echo coefficient, the transition band of 4GHz-5GHz is roll-offed and is greater than 80dB, the stopband of 5GHz-14GHz suppresses to be greater than the signal output of 80dB, the size that has overcome coaxial cavity low pass filter is large, be difficult for improving the shortcoming of port match, realized again high-quality signal output, dwindled small product size, reduced power consumption, assembling and the debugging work load of complete machine have been reduced.
Accompanying drawing explanation
Fig. 1 is the structural representation of 26 rank strip line low-pass filtering modules in the present invention;
Fig. 2 is the schematic diagram that adopts 26 rank strip line low-pass filtering module scattering parameters in the present invention;
Fig. 3 is the structural representation of 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit in the present invention;
Fig. 4 is the schematic diagram that adopts 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit optimized circuit;
Fig. 5 is the structural representation of ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit in the present invention;
Fig. 6 is the schematic diagram that adopts ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit optimized circuit.
Embodiment
The invention provides a kind of open circuit stepped impedance low pass filter in parallel, for making object of the present invention, technical scheme and effect clearer, clear and definite, below the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of open circuit stepped impedance low pass filter in parallel, it comprises the 26 rank strip line low-pass filtering modules that are arranged between microwave sheet material central layer and prepreg, described 26 rank strip line low-pass filtering modules comprise for the treatment of 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter units 1 of low frequency and ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 for the treatment of high frequency, as shown in Figure 1, for instant noodles are described, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 is spaced apart with described ten single order open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 use one dotted lines, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 forms described 26 rank strip line low-pass filtering modules with 2 cascades of described ten single order open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit, as shown in Figure 2, signal after described 26 rank strip line low-pass filtering modules are processed meets 0Hz-4GHz passband insertion loss and is less than 2.5dB, be less than-18dB of passband echo coefficient, the transition band of 4GHz-5GHz is roll-offed and is greater than 80dB, and the stopband of 5GHz-14GHz suppresses to be greater than the condition of 80dB.
In another preferred embodiment of the present invention, as shown in Figure 3, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 is symmetrical structure, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 comprises the first termination 50 ohm characteristic impedance stripline resonators 3, on described the first termination 50 ohm characteristic impedance stripline resonators 3, be in series with the first stripline resonator 4 of eight same impedance, last first stripline resonator doubles as the public connecting end 5 of described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 open circuit in parallel with described ten single orders stepped impedance strip line elliptic function low-pass filter unit 2 cascades, between adjacent the first stripline resonator 4, all access one first and regulate stripline resonator 6, described first regulates stripline resonator 6 to be comprised of the shorting stub of two open circuits, as shown in Figure 8, the signal of processing through described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 meets 4GHz passband insertion loss and is less than 2dB, be less than-18dB of passband echo coefficient, the transition band of the 4GHz-5GHz 100dB that roll-offs, the stopband of 5.5GHz-8GHz suppresses to be greater than the condition of 50dB.
Further, as shown in Figure 5, described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 comprises described public connecting end 5, on described public connecting end 5, be in series with the second stripline resonator 7 of five same impedance, last second stripline resonator is connected with the second termination 50 ohm characteristic impedance stripline resonators 8, between described public connecting end 5 and the second stripline resonator 7 being connected, and between adjacent the second stripline resonator 7, all access two second and regulate stripline resonators 9, described second regulates stripline resonator 9 to be comprised of the shorting stub of two open circuits, as shown in Figure 6, the signal of processing through described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit meets 4GHz passband insertion loss and is less than 0.5dB, be less than-18dB of passband echo coefficient, and the stopband of 8GHz-14GHz suppresses to be greater than the condition of 50dB.
In order further to describe technical scheme of the present invention, below carry out more detailed narration.
First, prepare described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 to realize the index request of passband and stopband near-end: 0Hz-4GHz passband insertion loss is less than 1.8dB, be less than-18dB of passband echo coefficient, the transition band of the 4GHz-5GHz 100dB that roll-offs, the stopband of 5.5GHz-8GHz suppresses to be greater than 50dB.In the implementation procedure of this grade of low-pass filtering, according to index, from difficulty to easy order, increase gradually the exponent number of filter.Second, prepare described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 to realize the index request of passband and stopband far-end: 0Hz-4GHz passband insertion loss is less than 0.7dB, be less than-18dB of passband echo coefficient, and the stopband of 8GHz-14GHz suppresses to be greater than 50dB.In the implementation procedure of this grade of low-pass filtering, according to stop-band frequency order from low to high, increase gradually the exponent number of filter.The 3rd, the cascade of two-stage low-pass filter unit is formed to 26 rank strip line low-pass filtering modules, meet default overall objective requirement.The 4th, 26 rank principle of lowpass filter figure after cascade are generated to Layout domain, by the Momentum Electromagnetic Simulation software of ADS2009, carry out simulating, verifying, see whether Electromagnetic Simulation result meets final overall objective requirement.
And first order low-pass filter unit is described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1, as shown in Figure 3, this grade of low-pass filter unit mainly realized the index of passband and stopband near-end (passband and stopband near-end claim again low frequency): 0Hz-4GHz passband insertion loss is less than 1.8dB, be less than-18dB of passband echo coefficient, the transition band of the 4GHz-5GHz 100dB that roll-offs, the stopband of 5.5GHz-8GHz suppresses to be greater than 50dB.Described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 is symmetrical structure.Wherein Lp1 is the first termination 50 ohm characteristic impedance stripline resonators 3 of series connection; Ls1, Ls2, Ls3 and Ls4 are first stripline resonator 4 with identical high impedance of series connection; Lt1 jointly forms in parallel first of the open circuit stepped impedance that has with Lc1, Lt2 and Lc2, Lt3 and Lc3 and regulates stripline resonator 6.Said elements all contains two parameters separately: live width and line length.Wherein the live width of Lp1 and line length are fixed values; The stopband resonance frequency that regulates Lt1 mainly to change in parallel open circuit stepped impedance low pass filter with Lc2, Lt3 with live width and the line length of Lc3 with Lc1, Lt2; And the live width of adjusting Ls1, Ls2, Ls3 and Ls4 and line length mainly change passband insertion loss and the passband echo coefficient of open circuit stepped impedance low pass filter in parallel.
According to the index request of passband and stopband near-end, passband and stopband near-end claim again low frequency, determine that the value of described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 each circuit element needs 4 suddenly.
The first step, establishes identical initial value first to live width and the line length of Ls1, Ls4, Ls3 and Ls2, and its live width is that 0.17mm, line length are 2mm.The live width and the line length that regulate Lc1 and Lt1, obtaining first stopband resonant frequency point is 5GHz, and makes the pad value at 5GHz place be greater than 100dB.
Second step, live width and the line length of adjusting Lt2 and Lc2, obtaining second stopband resonant frequency point is 6.5GHz, and makes the pad value at 5.5GHz-7GHz place be greater than 50dB.
The 3rd step, live width and the line length of adjusting Lt3 and Lc3, obtaining the 3rd stopband resonant frequency point is 7.5GHz, and makes the pad value at 7GHz-8GHz place be greater than 50dB.
The 4th step, live width and the line length of adjusting Ls1, Ls4, Ls3 and Ls2, make 0Hz-4GHz passband insertion loss be less than 1.8dB, be less than-18dB of passband echo coefficient.
Can realize the index request of passband and stopband near-end, for example, as shown in Figure 4, the S distributed constant calculating by the circuit component values after one group of optimization.
Second level low-pass filter unit is described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2, structure as shown in Figure 5, this grade of low-pass filter unit mainly realized the index of passband and stopband far-end (passband and stopband far-end claim again high frequency): 0Hz-4GHz passband insertion loss is less than 0.7dB, be less than-18dB of passband echo coefficient, and the stopband of 8GHz-14GHz suppresses to be greater than 50dB.Described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 shown in Fig. 9 is symmetrical structure.Wherein Lp1 is the second termination 50 ohm characteristic impedance stripline resonators 8 of series connection; Ls5, Ls6 and Ls7 are second stripline resonator 7 with identical high impedance of series connection; Lt6 jointly forms in parallel second of the open circuit stepped impedance that has with Lc6, Lt7 and Lc7, Lt8 and Lc8 and regulates stripline resonator 9.Similar with described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter units 1 above, to regulate Lt6 mainly to change in parallel open circuit stepped impedance low pass filter with Lc7, Lt8 with live width and the line length of Lc8 with Lc6, Lt7 stopband resonance frequency; And the live width of adjusting Ls5, Ls6 and Ls7 and line length mainly change passband insertion loss and the passband echo coefficient of open circuit stepped impedance low pass filter in parallel.
According to the index request of passband and stopband far-end, passband and stopband far-end claim again high frequency, determine that the value of described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 each circuit elements needs 4 suddenly.
The first step, establishes identical initial value first to live width and the line length of Ls5, Ls6 and Ls7, and its live width is that 0.17mm, line length are 2mm.The live width and the line length that regulate Lc6 and Lt6, obtaining the 4th stopband resonant frequency point is 8.5GHz, and makes the pad value at 8GHz～9GHz place be greater than 50dB.
Second step, live width and the line length of adjusting Lt7 and Lc7, obtaining the 5th stopband resonant frequency point is 10GHz, and makes the pad value at 9GHz-11GHz place be greater than 50dB.
The 3rd step, live width and the line length of adjusting Lt8 and Lc8, obtaining the 6th stopband resonant frequency point is 12.5GHz, and makes the pad value at 11GHz-14GHz place be greater than 50dB.
The 4th step, live width and the line length of adjusting Ls5, Ls6 and Ls7, make 0Hz-4GHz passband insertion loss be less than 0.7dB, be less than-18dB of passband echo coefficient.
Like this, by 4 steps, can realize the index request of passband and stopband far-end.For example, as shown in Figure 6, the S distributed constant calculating by the circuit component values after one group of optimization.
Described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 refers to 2 cascades of described ten single order open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit, after the Lp1 circuit element of Ls1, the Lp1 of open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 1 low order end of 15 rank described in Fig. 3 and described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit 2 high order ends shown in Fig. 5 is removed, directly docking just forms 26 rank low pass filters.The value of 26 rank each circuit elements of low pass filter that form remains unchanged, the S distributed constant obtaining with the circuit component values emulation of previous calculations, as shown in Figure 2.
Certainly; more than explanation is only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this specification; that makes is allly equal to alternative, obvious variant, within all dropping on the essential scope of this specification, ought to be subject to protection of the present invention.
Claims (3)
1. an open circuit stepped impedance low pass filter in parallel, it is characterized in that, it comprises the 26 rank strip line low-pass filtering modules that are arranged between microwave sheet material central layer and prepreg, described 26 rank strip line low-pass filtering modules comprise for the treatment of 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter units of low frequency and ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit for the treatment of high frequency, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit and the cascade of described ten single order open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit, signal after described 26 rank strip line low-pass filtering modules are processed meets 0Hz-4GHz passband insertion loss and is less than 2.5dB, be less than-18dB of passband echo coefficient, the transition band of 4GHz-5GHz is roll-offed and is greater than 80dB, the stopband of 5GHz-14GHz suppresses to be greater than the condition of 80dB.
2. open circuit stepped impedance low pass filter in parallel according to claim 1, it is characterized in that, described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit comprises the first termination 50 ohm characteristic impedance stripline resonators, on described the first termination 50 ohm characteristic impedance stripline resonators, be in series with the first stripline resonator of eight same impedance, last first stripline resonator doubles as the public connecting end of described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit open circuit in parallel with described ten single orders stepped impedance strip line elliptic function low-pass filter unit cascade, between adjacent the first stripline resonator, all access one first and regulate stripline resonator, described first regulates stripline resonator to be comprised of the shorting stub of two open circuits, the signal of processing through described 15 rank open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit meets 4GHz passband insertion loss and is less than 2dB, be less than-18dB of passband echo coefficient, the transition band of the 4GHz-5GHz 100dB that roll-offs, the stopband of 5.5GHz-8GHz suppresses to be greater than the condition of 50dB.
3. open circuit stepped impedance low pass filter in parallel according to claim 2, it is characterized in that, described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit comprises described public connecting end, on described public connecting end, be in series with the second stripline resonator of five same impedance, last second stripline resonator is connected with the second termination 50 ohm characteristic impedance stripline resonators, between described public connecting end and the second stripline resonator being connected, and between adjacent the second stripline resonator, all access two second and regulate stripline resonators, described second regulates stripline resonator to be comprised of the shorting stub of two open circuits, the signal of processing through described ten single orders open circuit in parallel stepped impedance strip line elliptic function low-pass filter unit meets 4GHz passband insertion loss and is less than 0.5dB, be less than-18dB of passband echo coefficient, and the stopband of 8GHz-14GHz suppresses to be greater than the condition of 50dB.
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| CN104538712A (en) * | 2014-12-09 | 2015-04-22 | 成都九洲迪飞科技有限责任公司 | LTE high-restrain high-pass filter |
| CN106099279A (en) * | 2016-08-01 | 2016-11-09 | 中国电子科技集团公司第五十五研究所 | A kind of high-end precipitous roll-off filter of miniaturization passband |
| CN106450614A (en) * | 2016-12-21 | 2017-02-22 | 中国航空工业集团公司雷华电子技术研究所 | Ultra-wide stopband miniaturized microstrip resonant cell low pass filter |
| CN106450614B (en) * | 2016-12-21 | 2019-03-29 | 中国航空工业集团公司雷华电子技术研究所 | A kind of ultra-wide stopband Mini Microstrip resonant element low-pass filter |
| CN110364791A (en) * | 2018-04-09 | 2019-10-22 | 西安邮电大学 | A kind of Ku wave band compact bandpass filter based on LCP |
| CN109786904A (en) * | 2018-11-21 | 2019-05-21 | 江苏贝孚德通讯科技股份有限公司 | Wide stop bands band line low-pass filter and dielectric waveguide filter |
| CN109786905A (en) * | 2019-01-31 | 2019-05-21 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Strip line low-pass filter |
| CN109786905B (en) * | 2019-01-31 | 2020-06-26 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Strip line low pass filter |
| CN113506963A (en) * | 2021-06-09 | 2021-10-15 | 电子科技大学 | Based on VO2Multifunctional filter |
| CN114172484A (en) * | 2021-12-13 | 2022-03-11 | 扬州海科电子科技有限公司 | EMI filter-oriented optimization method and EMI filter |
| CN114914646A (en) * | 2022-05-12 | 2022-08-16 | 安徽阖煦微波技术有限公司 | Band elimination filter of standard waveguide port |
| CN114914646B (en) * | 2022-05-12 | 2023-11-03 | 安徽阖煦微波技术有限公司 | Band-stop filter of standard waveguide port |
| CN117352982A (en) * | 2023-11-24 | 2024-01-05 | 佛山市波谱达通信科技有限公司 | Ultra-wideband microstrip combiner |
| CN117352982B (en) * | 2023-11-24 | 2024-04-26 | 佛山市波谱达通信科技有限公司 | Ultra-wideband microstrip combiner |
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