CN104078726B - Parallel connection type one side elliptic function line filter - Google Patents
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Abstract
A kind of parallel connection type one side elliptic function filter being made up of transmission line element that the present invention proposes, input signal is divided into two-way transmission from input transmission line (1) feed-in first cruciform joint (2) in parallel, (3) and transmission line joint (4) transmission in parallel is saved to the second cruciform joint (7) in parallel respectively, from output transmission line (8) output after two-way synthesis through cascaded transmission line.Two open circuited transmission line minor matters are connected on two cruciform joints in parallel and adjust reflected signal amplitude.For given cut-off frequency fc, by selecting each transmission line element parameter, produce two or more frequency and be below or higher than fcNon-zero finite frequency hop zero point, and in its vicinity frequency band formed passband；Produce two or more frequency to be above or lower than f simultaneouslycNon-zero finite frequency transmission zero, and in its vicinity frequency band formed stopband, thus realizing fcNeighbouring unilateral elliptic function filter characteristic.The present invention is suitable for microwave and millimeter wave frequency band low middling bandwidth, low-loss, highly selective filter.
Description
Technical field
The present invention relates to one and be widely used in the systems such as microwave and millimeter wave band communication, radar and measurement instrument, for the frequency response of control signal, block the transmission of garbage signal frequency component, make useful signal frequency component almost without the wave filter passed through damply.
Background technology
Wave filter is microwave circuit and wide variety of passive circuit in system, for realizing specific selecting frequency characteristic, wave filter can be divided into the types such as high pass, low pass, bandpass and band resistance by transmission characteristic, and the performance indications of circuit are had a great impact by the performance such as the pass band insertion loss of wave filter, belt resistance inhibitor system.Along with frequency resource growing tension, frequency spectrum day by day crowded, the selecting frequency characteristic of wave filter is had higher requirement by radio system, require that there is the characteristics such as more precipitous intermediate zone attenuation characteristic (or high squareness factor), passband low insertion loss, smooth passband group delay, bigger bandwidth of rejection and belt resistance inhibitor system, and along with the raising that system compact requires, it is necessary to realize the miniaturization of wave filter as far as possible and integrated.
For the ease of utilizing network synthesis technology to design wave filter, traditional method is to utilize the filter transfer characteristic needed for specific function approximation, and realizes specific transfer function by network synthesis.The type function being commonly used to approach filter transfer characteristic has maximally-flat type, Chebyshev type and Elliptic Function Type, wherein Elliptic Function Type transfer function has transmission zero and limit at the stopband finite frequency place of wave filter, and therefore improves the Out-of-band rejection performance of band filter.Elliptic function filter compact conformation, has the Out-of-band rejection degree of better transient characteristic and Geng Gao than Chebyshev filter, can realize superior frequency-selecting performance.But circuit realiration is complicated, it is typically employed between non-conterminous resonator cavity to induce one cross-coupled manner and realizes.Although to this existing widely studied with the comprehensive of cross-linked wave filter and design, but its processing and debugging difficulty are all relatively big, limit its engineer applied.
In order to realize the good frequency selective characteristic near working band, currently mainly adopt band filter and band elimination filter, but there is the abrupt transition band filter with attenuation characteristic it is generally required to multiple filter, multiple filter is to be made up of a series of resonators intercoupled, its insertion loss is bigger, in band, group delay and fluctuation thereof increase, and volume is bigger simultaneously.Multistage band elimination filter has same shortcoming.The wave filter adopting single high q-factor resonant tank can realize relatively low insertion loss, but this single-mesh filter narrower bandwidth, it is difficult to meet application request.
Wave filter much should in, the selecting frequency characteristic near system working frequency range more paid close attention to, and wave filter low insertion loss and small form factor requirements are even more important, typical application include as preselector, duplexer or multiplexer, for suppressing to launch the wave filter of the specific clutter component of signal and for suppressing to launch the wave filter of leakage at receiving front-end.As a rule, these wave filter only require have precipitous intermediate zone characteristic, moderate passband and resistance band in the one side of passband, but require that Insertion Loss is as far as possible low, to reduce system loss, should have simple in construction and miniaturization feature, it is simple to processing realizes and system integration application simultaneously.
Summary of the invention
It is an object of the invention to the weak point and the application demand that exist for above-mentioned prior art, there is provided a kind of circuit form simple, being easily integrated, miniaturization, passband and bandwidth of rejection are moderate, it is easily achieved in passband low insertion loss, there is the unilateral elliptic function transmission characteristic line filter of excellent frequency selectivity.
For reaching object above, the present invention proposes a kind of parallel connection type one side elliptic function line filter, including: input and output transmission line, cruciform joint in parallel, open circuited transmission line minor matters, cascaded transmission line joint and transmission line joint in parallel, it is characterized in that: cruciform joint in parallel is to realize any four four port transmission kind of thread elements being connected in parallel with type transmission line, two cruciform joint specular in parallel are connected to the two ends of cascaded transmission joint 3, and connect the first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 respectively in a respective symmetrical ports；Bridging transmission line joint 4 in parallel between two respective 3rd symmetrical ports of cruciform joint in parallel, respective 4th port connects output input transmission line 1 and output transmission line 8 respectively, input signal is from inputting transmission line 1 feed-in first cruciform joint 2 in parallel, part signal is reflected back toward input transmission line because of impedance mismatching, all the other signals are divided into two-way transmission, one tunnel is through transmission line joint 4 in parallel, another road saves 3 via cascaded transmission line, two paths of signals, is exported from output transmission line 8 after remainder synthesis because impedance mismatching reflects again at the second cruciform joint 7 place in parallel；First open circuited transmission line minor matters the 5, second open circuited transmission line minor matters 6 are for adjusting amplitude and the phase place of input and output side reflected signal；Characteristic impedance and filter cutoff frequency f at any given input transmission line 1 and output transmission line 8cUnder condition, by selecting the linear electrical parameter of cascaded transmission line joint 3, transmission line joint 4 in parallel and open circuited transmission line minor matters 5,6, adjust amplitude and the phase place of two-way transmission signal respectively, at given filter cutoff frequency fcOn, produce at least two frequency and be above fcFinite frequency reflection zero, and frequency band shaping filter passband in its vicinity, produce two or more frequency simultaneously and be below fcNon-zero finite frequency transmission zero, and in its vicinity frequency band shaping filter stopband, passband and stopband at cut-off frequency fcUpper adjacent, thus realizing fcNeighbouring high-pass type elliptic function filter characteristic；Or at given filter cutoff frequency fcOn, produce two or more frequency and be below fcNon-zero finite frequency hop zero point, and frequency band shaping filter passband in its vicinity, produce two or more frequency simultaneously and be above fcFinite frequency transmission zero, and in its vicinity frequency band shaping filter stopband, passband and stopband at cut-off frequency fcUpper adjacent, thus realizing fcNeighbouring Low-Pass Filter elliptic function filter characteristic.
The present invention has the advantages that compared to prior art
Filter circuit form is simple, it is easy to accomplish integrated, miniaturization.The wave filter that the present invention proposes pertains only to basic transmission line element, has excellent high frequency performance, and filter circuit can accurate modeling and emulation, it is easy to design and realizing.The transmission line form of transmission line element used is not limited；Cruciform joint in parallel can adopt the various variant such as two T connector cascades in parallel；In wave filter, open circuited transmission line minor matters can adopt the short-circuited transmission line minor matters form that electrical length increases and decreases 90 °；Transmission line element can adopt straight line, broken line, crepe cord or its combining form, and adopts multilayer dielectricity substrate integrated transmission-line and by forms such as interlayer interconnections, it is possible to reduces wave filter volume size.Meanwhile, filter circuit all adopts transmission line element, and transmission line element has that parasitic parameter is little, the feature of low-loss and excellent in high-frequency characteristics so that circuit can apply to realize the low loss filter of more than millimeter wave frequency band.Therefore, wave filter operating frequency up to millimeter wave with super band.Wave filter can adopt planar transmission line form, it is easy to processing and fabricating and realize wave filter miniaturization, integrated.
The present invention consists of the symmetrical Two-port netwerk distributed parameter network with multiple resonance characteristic, its transmission coefficient cut-off frequency f transmission line elementcResonant frequency f in open circuited transmission line minor mattersrNear.By selecting impedance and the electrical length parameter of each transmission line element, two or more frequency can be produced and be below or higher than fcNon-zero finite frequency hop zero point, and frequency band shaping filter passband in its vicinity；Produce two or more frequency to be above or lower than f simultaneouslycNon-zero finite frequency transmission zero, and frequency band shaping filter stopband in its vicinity, thus realizing fcNeighbouring unilateral elliptic function filter characteristic.It is respectively provided with two or more reflection zero and transmission zero due to passband and stopband, thus there is passband and the bandwidth of rejection of 10%～20%.Simultaneously as the filter circuit of the present invention does not have the coupled structure of complexity, the simple transmission kind of thread elements adopted itself has again low loss characteristic, is thus susceptible to realize low insertion loss in passband.
Closely, circuit area is less than 1/4 of the interdigital filter with same selectivity and same transmission line form, also compact than other elliptic function filter for physical arrangement of the present invention.This wave filter has excellent selectivity, and attenuation pole and the transmission pole of passband in stopband can control respectively, can realize very precipitous selecting frequency characteristic curve near cut-off frequency.This wave filter has moderate passband and the bandwidth of rejection of 10-20%, and in-band insertion loss is little, is suitable for microwave and millimeter wave frequency band low middling bandwidth, low-loss, highly selective filter.
The good agreement of test result and simulation result demonstrates correctness and the effectiveness of this filter circuit.Test shows: this wave filter can meet the requirement of miniaturization, has again abrupt transition with attenuation characteristic and moderate passband and bandwidth of rejection, has the excellent filtering characteristics such as pass band insertion loss is low simultaneously.Based on above reason, this wave filter is particularly suitable for miniaturization, integrated duplexer, preselector and the transmitting signal near-end contour selectivity of spurious reduction wave filter, low loss filter.
Accompanying drawing explanation
Fig. 1 is parallel connection type one side of the present invention elliptic function line filter circuit diagram.
Fig. 2 is reflection and the transfer curve schematic diagram of the parallel connection type one side elliptic function line filter adopting microstrip transmission line.
In figure: 1 input transmission line, 2 first cruciform joints in parallel, 3 cascaded transmission line joints, 4 transmission line joints in parallel, 5 first open circuited transmission line minor matters, 6 second open circuited transmission line minor matters, 7 second cruciform joints in parallel, 8 output transmission lines.
Detailed description of the invention
Consult Fig. 1.In embodiment described below, parallel connection type one side elliptic function transmission line ripple device is made up of 6 basic transmission line element such as input and output transmission line, cruciform joint in parallel, open circuited transmission line minor matters, cascaded transmission line joint, transmission line joints in parallel, and each transmission line element has the annexation shown in accompanying drawing 1.Each transmission line all have employed two-wire form and represents, physical circuit realizes adopting the various high frequency transmission line forms comprising two conductor transmission line.Each transmission line joint and transmission line minor matters all can adopt two conductor transmission line in interior various high frequency transmission line forms；Described cruciform joint in parallel is for realizing any 4 four port transmission kind of thread elements being connected in parallel with type transmission line；Two cruciform joints 2,7 in parallel have mirror image, are symmetrically connected to the two ends of cascaded transmission joint 3, and connect the first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 respectively at a respective symmetric position port；Bridging transmission line joint 4 in parallel between first cruciform joint 2, second respective 3rd the symmetric position port of cruciform joint 7 in parallel in parallel, each a remaining port connects output input transmission line 1 and output transmission line 8 respectively, and combination forms Π type distributed constant symmetrical two-port network.
In circuit shown in Fig. 1, the distributed constant two-port network that input and output transmission line, cruciform joint in parallel, short-circuited transmission line minor matters, cascaded transmission line joint and transmission line joint transmission line element in parallel are constituted has multiple resonance characteristic, this network will produce one group of non-zero finite frequency transmission zero and one group of non-zero finite frequency hop zero point in wave filter working band, the two does not overlap adjoining on the frequency axis, thus having unilateral elliptic function filter characteristic.Input signal is from inputting transmission line 1 feed-in first cruciform joint 2 in parallel, at this part signal because impedance mismatching is reflected back toward input transmission line, all the other signals are divided into two-way transmission, one tunnel is through transmission line joint 4 in parallel, another road saves 3 via cascaded transmission line, two paths of signals is at the second cruciform joint 7 place in parallel, and part signal is reflected again because of impedance mismatching, exports from output transmission line 8 after all the other signal syntheses.First open circuited transmission line minor matters the 5, second open circuited transmission line minor matters 6 are used for adjusting input and output side reflected signal amplitude and phase place.Characteristic impedance and filter cutoff frequency f at given input transmission line 1 and output transmission line 8cUnder condition, by selecting the linear electrical parameter of cascaded transmission line joint 3, transmission line joint 4 in parallel and open circuited transmission line minor matters 5,6, adjust amplitude and the phase place of two paths of signals and input and output reflected signal respectively, can at given filter cutoff frequency fcNear, produce at least two frequency and be above fcFinite frequency reflection zero, and frequency band shaping filter passband in its vicinity, produce at least two frequency simultaneously and be below fcNon-zero finite frequency transmission zero, and in its vicinity frequency band shaping filter stopband, passband and stopband at cut-off frequency fcUpper adjacent, thus realizing fcNeighbouring high-pass type elliptic function filter characteristic；Or at given filter cutoff frequency fcOn, produce at least two frequency and be below fcNon-zero finite frequency hop zero point, and frequency band shaping filter passband in its vicinity, produce at least two frequency simultaneously and be above fcFinite frequency transmission zero, and in its vicinity frequency band shaping filter stopband, passband and stopband at cut-off frequency fcUpper adjacent, thus realizing fcNeighbouring Low-Pass Filter elliptic function filter characteristic.
Initial parameter is optional as follows: at given filter cutoff frequency fcOn, cascaded transmission line joint 3 has electrical length less than 180 °, and transmission line joint 4 in parallel has more than 270 ° but electrical length less than 360 °, and the first open circuited transmission line minor matters 5 are identical with the second open circuited transmission line minor matters 6, and electrical length is all higher than 180 ° but less than 360 °.By designing suitable transmission line element characteristic impedance and electrical length in range above, f can be realizedcNeighbouring unilateral elliptic function transmission characteristic.
In filter circuit, the first open circuited transmission line minor matters 5, the second open circuited transmission line minor matters 6 parameter is identical, at transmission zero frequency fs1Upper electrical length all reaches 270 °, is equivalent to shorted to earth, forms a transmission zero.Input signal is from input transmission line 1 feed-in first cruciform joint 2 in parallel, and part is reflected back toward input transmission line, and all the other signals are divided into two-way transmission, and a road is through transmission line joint 4 in parallel, and another road saves 3 via cascaded transmission line, at frequency transmission zero fs2On, the transmission coefficient amplitude of this two paths is equal, opposite in phase, and the two paths of signals after transmission is cancelled out each other at the second cruciform joint 7 place in parallel, produces second transmission zero.
Frequency input signal is lower than transmission zero fs1Time, first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 electrical length are between 180 °～270 °, it is equivalent to capacitive parallel reactance, and it is equivalent to series inductance after cascaded transmission line joint 3 and transmission line joint 4 in parallel combination, these four element combinations form Π type low-pass network, can be equivalent to a right-handed transmission line joint.Suitably select linear electrical parameter, can less than transmission zero fs1At least two nonzero frequency fp1、fp2On make this right-handed transmission line joint impedance with input transmission line 1 and export transmission line 8 mate, form two reflection zeros, and make fp1<fp2<fs2<fs1, so that wave filter has Low-Pass Filter elliptic function transmission characteristic, its cut-off frequency is at fs1Near.Frequency input signal is higher than transmission zero fs1Time, first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 electrical length are between 270 °～360 °, it is equivalent to inductive parallel reactor, and it is equivalent to series capacitance after cascaded transmission line joint 3 and transmission line joint 4 in parallel combination, these four element combinations form Π type high pass network, a left hand transmission line joint can be equivalent to, suitably select linear electrical parameter, can higher than transmission zero fs1At least two frequency fp3、fp4On make this left hand transmission line joint impedance with input transmission line 1 and export transmission line 8 impedance matching, form two reflection zeros, and make fs1<fs2<fp3<fp4, so that wave filter has close to fs1Cut-off frequency near high-pass type elliptic function transmission characteristic.Therefore, designing different linear electrical parameters can make filter circuit have high pass or low pass elliptic function transmission characteristic.
Transmission line element transmission line form used is not limited by circuit design；First cruciform joint 2 in parallel, the second cruciform joint 7 in parallel can adopt the various variant such as two T connector cascades in parallel；Transmission line element can adopt straight line, broken line, crepe cord or its combining form, and adopts multilayer dielectricity substrate integrated transmission-line and by forms such as interlayer interconnections, to reduce wave filter volume size.
Fig. 2 describes reflection and the transfer curve of a typical microstrip transmission line parallel connection type one side elliptic function line filter circuit, it can be clearly seen that there are 3 transmission zeros in stopband from figure, has two reflection zeros in passband.
The present invention is embodied as adopting following steps: first according to system application requirement, select suitable transmission line way of realization.Consider the plane class transmission lines such as the integrated optional microstrip line of wave filter, strip line, consider that low-loss then should select the low loss lines such as waveguide, but need to consider to adopt same transmission line form with prime or late-class circuit, to avoid the volume size that transport mode translations is brought increase and thus introduce extra loss.Secondly, according to application demand, it is determined that cut-off frequency fc, passband and bandwidth of rejection, passband and bandwidth of rejection fcBeing normalized to relative bandwidth, its value should less than 20%.
Utilize CAD program of microwave circuit, set up respective filter circuit, set required transmission characteristic design object, by the Optimized Program of software, it is determined that each element transmission line parameter.Can also passing through manual iteration and calculate design of filter, method is as follows: set two transmission zero f in filter stop bends1、fs2, two reflection zeros in passband are f for left side elliptic function filterp1、fp2, it is f to right side elliptic function filterp3、fp4, set up equation group by the condition of the formation transmission zero described in wave filter operation principle and reflection zero, solve the impedance and electrical length that obtain each transmission line element.
After determining design parameter, electromagnetic simulation software environment is set up the structural model of wave filter, carry out final design checking by electromagnetic-field simulation.
Claims (10)
1. a parallel connection type one side elliptic function line filter, including: input, output transmission line, cruciform joint in parallel, open circuited transmission line minor matters, cascaded transmission line joint and transmission line joint in parallel, it is characterized in that: each transmission line joint and transmission line minor matters adopt two conductor transmission line in interior high frequency transmission line form, cruciform joint in parallel is to realize any four four port transmission kind of thread elements being connected in parallel with type transmission line, two cruciform joints (2 in parallel, 7) specular, it is connected to the two ends of cascaded transmission joint (3), and the first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) are connected respectively in a respective symmetrical ports；Bridging transmission line joint (4) in parallel between two respective 3rd symmetrical ports of cruciform joint in parallel, respective 4th port connects input transmission line (1) and output transmission line (8) respectively, input signal is from inputting transmission line (1) feed-in first cruciform joint (2) in parallel, part signal at this because impedance mismatching is reflected back toward input transmission line, all the other signals are divided into two-way transmission, one tunnel is through transmission line joint (4) in parallel, (3) are saved via cascaded transmission line in another road, two paths of signals the second cruciform joint (7) in parallel because impedance mismatching is reflected again, from output transmission line (8) output after all the other signal syntheses；First open circuited transmission line minor matters (5), the second open circuited transmission line minor matters (6) adjust input and output side reflected signal amplitude and phase place；Characteristic impedance and filter cutoff frequency in any given input transmission line (1) and output transmission line (8)f c Under condition, by selecting the linear electrical parameter of cascaded transmission line joint (3), transmission line joint (4) and open circuited transmission line minor matters (5,6) in parallel, adjust amplitude and the phase place of two-way transmission signal respectively, and input the amplitude with output reflection signal and phase place, produce at least two upper frequency and be below or be higher thanf c Non-zero finite frequency hop zero point, and at itf c Near frequency band shaping filter passband, simultaneously produce at least two frequency be above or lower thanf c Non-zero finite frequency transmission zero, andf c Neighbouring frequency band shaping filter stopband, thus realizingf c Neighbouring unilateral elliptic function low pass or high-pass filtering characteristic.
2. parallel connection type one side according to claim 1 elliptic function line filter, it is characterised in that: at given filter cutoff frequencyf cOn, cascaded transmission line joint (3) has less than 180oElectrical length, transmission line joint (4) in parallel has more than 270oBut less than 360oElectrical length, the first open circuited transmission line minor matters (5) are identical with the second open circuited transmission line minor matters (6), and electrical length is all higher than 180oBut less than 360o。
3. parallel connection type one side according to claim 1 elliptic function line filter, it is characterised in that: in filter circuit, the first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) are in frequency f s1 Upper electrical length is 270o, is equivalent to shorted to earth, forms a transmission zero f s1 。
4. parallel connection type one side according to claim 1 elliptic function line filter, it is characterized in that: input signal is after the first cruciform joint (2) place in parallel part is reflected, remainder is divided into two-way, (3) and transmission line joint (4) two paths transmission in parallel is saved respectively, in frequency via cascaded transmission line f s2 On, the transmission coefficient amplitude of this two paths is equal, opposite in phase, and the two paths of signals after transmission is cancelled out each other at the second cruciform joint (7) place in parallel, produces second transmission zero f s2 。
5. parallel connection type one side according to claim 1 elliptic function line filter, it is characterised in that: frequency is lower than transmission zero f s1 Time, first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) electrical length are between 180o～270o, it is equivalent to capacitive parallel reactance, and it is equivalent to series inductance after cascaded transmission line joint (3) and transmission line joint (4) combination in parallel, these four element combinations form Π type low-pass network, can be equivalent to a right-handed transmission line joint.
6. parallel connection type one side according to claim 5 elliptic function line filter, it is characterised in that: suitably select linear electrical parameter, less than transmission zero f s1 Two nonzero frequency f p1 、 f p2 On make this right-handed transmission line joint impedance with input transmission line (1) and export transmission line (8) mate, form two reflection zeros, and make f p1 <f p2 <f s2 <f s1 ,So that wave filter has closef s1Cut-off frequency near right side elliptic function transmission characteristic.
7. parallel connection type one side according to claim 1 elliptic function line filter, it is characterised in that: frequency input signal is higher than transmission zero f s1 Time, first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) electrical length are between 270o～360o, it is equivalent to inductive parallel reactor, and it is equivalent to series capacitance after cascaded transmission line joint (3) and transmission line joint (4) combination in parallel, these four element combinations form Π type high pass network, are equivalent to a left hand transmission line joint.
8. parallel connection type one side according to claim 7 elliptic function line filter, it is characterised in that: suitably select linear electrical parameter, can higher than transmission zero f s1 Two finite frequency f p3 、 f p4 OnMake the joint impedance of this left hand transmission line and input transmission line (1) and output transmission line (8) impedance matching, form two reflection zeros, and make f s1 <f s2 <f p3 <f p4 ,So that wave filter has closef s1Cut-off frequency near left side elliptic function transmission characteristic.
9. parallel connection type one side according to claim 1 elliptic function line filter, it is characterised in that: there is two or more non-zero finite transmission zero in stopband, in passband, have two or more non-zero finite reflection zero.
10. parallel connection type one side according to claim 1 elliptic function line filter, it is characterized in that: input and output transmission line, cruciform joint in parallel, short-circuited transmission line minor matters, cascaded transmission line joint and transmission line joint transmission line element in parallel constitute distributed parameter network, distributed constant two-port network has multiple resonance characteristic, this network will produce one group of non-zero finite frequency transmission zero and one group of non-zero finite frequency hop zero point in wave filter working band, the two does not overlap adjoining on the frequency axis, thus having unilateral elliptic function filter characteristic.
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| US9858532B2 (en) * | 2015-09-30 | 2018-01-02 | International Business Machines Corporation | Multimode josephson parametric converter: coupling josephson ring modulator to metamaterial |
| CN106788313B (en) * | 2017-02-13 | 2023-10-10 | 石家庄创天电子科技有限公司 | Feed circuit of filter and device based on feed circuit |
| CN110197940B (en) * | 2019-06-13 | 2021-10-08 | 中国电子科技集团公司第二十九研究所 | Improved hairpin line filter and operation method thereof |
| CN112909464B (en) * | 2021-01-25 | 2021-11-02 | 中天通信技术有限公司 | Microstrip combiner with uniform impedance branch loading |
| CN112864555B (en) * | 2021-01-25 | 2021-10-29 | 南通大学 | Suspension strip line cavity combiner with uniform impedance branch loading |
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