CN104078726A - Parallel connection type unilateral elliptic function transmission line filter - Google Patents
Parallel connection type unilateral elliptic function transmission line filter Download PDFInfo
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- CN104078726A CN104078726A CN201410244567.3A CN201410244567A CN104078726A CN 104078726 A CN104078726 A CN 104078726A CN 201410244567 A CN201410244567 A CN 201410244567A CN 104078726 A CN104078726 A CN 104078726A
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Abstract
The invention provides a parallel connection type unilateral elliptic function transmission line filter composed of transmission line elements. Input signals are fed into a first parallel connection cross joint (2) from an input transmission line (1) and divided into two paths to be transmitted to a second parallel connection cross joint (7) respectively through a cascading transmission line joint (3) and a parallel connection transmission line joint (4), and two paths of the input signals are synthesized and then output from an output transmission line (8). Two open circuit transmission line branch joints are connected to the two parallel connection cross joints respectively to adjust the amplitude of reflected signals. As for given cut-off frequency fc, various transmission line element parameters are selected, more than two nonzero limited frequency reflection null points with frequency lower than or higher than fc are generated, and a passing band is generated nearby a frequency band of the nonzero limited frequency reflection null points; meanwhile, more than two nonzero limited frequency transmission null points with frequency higher than or lower than fc are generated, a stop band is generated nearby a frequency band of the nonzero limited frequency transmission null points, and therefore filter characteristics of a unilateral elliptic function nearby fc are achieved. The filter is suitable for bandwidth below the medium degree of microwave and millimeter wave frequency bands, low loss, high selectivity.
Description
Technical field
The present invention relates to one is widely used in the systems such as the communication of microwave and millimeter wave frequency range, radar and measuring instrument, be used for the frequency response of control signal, the transmission of blocking-up unwanted signal frequency component, the filter that useful signal frequency component is passed through almost undampedly.
Background technology
Filter is the passive circuit of extensive use in microwave circuit and system, be used for realizing specific selecting frequency characteristic, filter can be divided into the types such as the logical and band resistance of high pass, low pass, band by transmission characteristic, the performance such as passband insertion loss, belt resistance inhibitor system of filter has a great impact the performance index of circuit.Along with frequency resource growing tension, frequency spectrum day by day crowded, radio system is had higher requirement to the selecting frequency characteristic of filter, requirement has more precipitous transition band attenuation characteristic (or high squareness factor), passband low insertion loss, smooth passband group delay, the larger characteristic such as bandwidth of rejection and belt resistance inhibitor system, and along with the raising that system miniaturization requires, need to realize as far as possible the miniaturization of filter and integrated.
For the ease of utilizing network synthesis technology to carry out designing filter, traditional method is the filter transmission characteristic of utilizing specific function approximation required, and realizes specific transfer function by network synthesis.The type function that is commonly used to approach filter transmission characteristic has maximally-flat type, Chebyshev's type and Elliptic Function Type, wherein Elliptic Function Type transfer function has transmission zero and limit at the stopband finite frequency place of filter, and therefore improves the Out-of-band rejection performance of band pass 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 is realized complicated, conventionally adopt the cross-couplings mode that induces one between non-conterminous resonant cavity to realize.Although to this existing broad research of comprehensive and design with cross-linked filter, its processing and debugging difficulty are all larger, have limited its engineering application.
In order to realize near good frequency selective characteristic working band, main band pass filter and the band stop filter of adopting at present, but the band pass filter with precipitous transition band attenuation characteristic generally needs multiple filter, multiple filter is to be made up of a series of resonators that intercouple, its insertion loss is larger, in band, group delay and fluctuation thereof increase, and volume is larger simultaneously.Multistage band stop filter has same shortcoming.Adopt the filter of single high Q value resonant tank to realize compared with low insertion loss, but this single-mesh filter bandwidth is narrower, is difficult to meet application request.
In a lot of the answering of filter, near the selecting frequency characteristic system works frequency range of more paying close attention to, and filter low insertion loss and miniaturization require even more important, typical application comprises as preselector, duplexer or multiplexer, for suppressing to transmit the filter of specific clutter component and for suppress the filter of transmit leakage at receiving front-end.As a rule, these filters are only required at passband one-sided and are had precipitous transition band characteristic, moderate passband and resistance band, but require Insertion Loss as far as possible low, to reduce system loss, should there is simple in structure and miniaturization feature simultaneously, be convenient to processing realization and system integration application.
Summary of the invention
The object of the invention is the weak point and the application demand that exist for above-mentioned prior art, provide a kind of circuit form simple, be easy to integrated, miniaturization, passband and bandwidth of rejection are moderate, be easy to realize low insertion loss in passband, there is the one-sided elliptic function transmission characteristic line filter of good frequency selectivity.
For reaching above object, the present invention proposes the one-sided elliptic function line filter of a kind of parallel connection type, comprise: input and output transmission line, cruciform joint in parallel, open circuited transmission line minor matters, cascade transmission line joint and transmission line in parallel joint, it is characterized in that: cruciform joint in parallel is to realize the four port transmission kind of thread elements that any four transmission lines of the same type are connected in parallel, two cruciform joint mirror image symmetries in parallel are connected to the two ends of cascade transmission joint 3, and connect respectively the first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 in a symmetrical ports separately; Cross-over connection transmission line joint 4 in parallel between two cruciform joints in parallel the 3rd symmetrical ports separately, the 4th port connects respectively output input transmission line 1 and output transmission line 8 separately, input signal is from input 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 is via cascade transmission line joint 3, two paths of signals, is exported from output transmission line 8 after remainder is synthetic because impedance mismatching is reflected again at the second cruciform joint in parallel 7 places; The first open circuited transmission line minor matters 5, the second open circuited transmission line minor matters 6 are for adjusting amplitude and the phase place of input and output side reflected signal; At characteristic impedance and the filter cutoff frequency f of any given input transmission line 1 and output transmission line 8
cunder condition, by selecting the linear electrical parameter of cascade transmission line joint 3, transmission line in parallel joint 4 and open circuited transmission line minor matters 5,6, adjust respectively amplitude and the phase place of two-way signal transmission, at given filter cutoff frequency f
cupper, produce at least two frequencies all higher than f
cfinite frequency reflection zero, and frequency band shaping filter passband in its vicinity, produce simultaneously two with upper frequency all lower than f
cnon-zero finite frequency transmission zero, and frequency band shaping filter stopband in its vicinity, passband and stopband are at cut-off frequency f
cupper adjacency, thus realize f
cnear high-pass type elliptic function filter characteristic; Or at given filter cutoff frequency f
cupper, produce two with upper frequency all lower than f
cnon-zero finite frequency reflection zero, and frequency band shaping filter passband in its vicinity, produce simultaneously two with upper frequency all higher than f
cfinite frequency transmission zero, and frequency band shaping filter stopband in its vicinity, passband and stopband are at cut-off frequency f
cupper adjacency, thus realize f
cnear Low-Pass Filter elliptic function filter characteristic.
The present invention has following beneficial effect than prior art:
Filter circuit form is simple, be easy to realize integrated, miniaturization.The filter that the present invention proposes only relates to basic transmission line element, has good high frequency performance, and filter circuit can accurate modeling and emulation, is easy to Design and implementation.Transmission line form to transmission line element used does not limit; Cruciform joint in parallel can adopt the various variant such as two T connector cascades in parallel; In filter, open circuited transmission line minor matters can adopt the short-circuited transmission line minor matters form of 90 ° of electrical length increases and decreases; 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 are interconnected, can dwindle 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, makes circuit can be applied to the low loss filter of realizing more than millimeter wave frequency band.Therefore, filter operating frequency can reach millimeter wave with super band.Filter can adopt planar transmission line form, is easy to processing and fabricating and realizes filter miniaturization, integrated.
The present invention consists of the symmetry two port distribution parameter networks with multiple resonance characteristic, its transmission coefficient cut-off frequency f transmission line element
cat the resonance frequency f of open circuited transmission line minor matters
rnear.By selecting impedance and the electrical length parameter of each transmission line element, can produce two with upper frequency all below or above f
cnon-zero finite frequency reflection zero, and frequency band shaping filter passband in its vicinity; Produce simultaneously two with upper frequency all higher or lower than f
cnon-zero finite frequency transmission zero, and frequency band shaping filter stopband in its vicinity, thus realize f
cnear one-sided elliptic function filter characteristic.Because passband and stopband have respectively more than two reflection zero and transmission zero, thereby there is 10%～20% passband and bandwidth of rejection.Meanwhile, because filter circuit of the present invention does not have complicated coupled structure, the simple transmission kind of thread elements adopting itself has again low loss characteristic, is therefore easy to realize low insertion loss in passband.
Physical structure of the present invention is very compact, circuit area be less than have same selectivity and same transmission line form interdigital filter 1/4, also than other elliptic function filter compactness.This filter has good selectivity, and the attenuation pole in stopband and the transmission pole of passband can be controlled respectively, can realize very precipitous selecting frequency characteristic curve near cut-off frequency.This 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 has been verified correctness and the validity of this filter circuit.Test shows: this filter can meet the requirement of miniaturization, has again precipitous transition band attenuation characteristic and moderate passband and bandwidth of rejection, has the good filtering characteristics such as passband insertion loss is low simultaneously.Based on above reason, this filter is particularly suitable for miniaturization, integrated duplexer, preselector and transmit high selectivity, the low loss filters such as the spuious rejects trap of near-end.
Brief description of the drawings
Fig. 1 is the one-sided elliptic function line filter of parallel connection type of the present invention circuit diagram.
Fig. 2 is reflection and the transfer curve schematic diagram that adopts the one-sided elliptic function line filter of parallel connection type of microstrip transmission line.
In figure: 1 input transmission line, 2 first cruciform joints in parallel, 3 cascade 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.
Embodiment
Consult Fig. 1.In embodiment described below, the one-sided elliptic function transmission line of parallel connection type 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, cascade transmission line joint, transmission line joints in parallel, and each transmission line element has the annexation shown in accompanying drawing 1.Each transmission line has all adopted two-wire form to represent, physical circuit is realized adopting and comprised two-conductor transmission line in interior various high frequency transmission line forms.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 the four port transmission kind of thread elements that are connected in parallel for realizing any 4 transmission lines of the same type; Two cruciform joints 2,7 in parallel have mirror image, and symmetry is connected to the two ends of cascade transmission joint 3, and connects respectively the first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 at a symmetric position port separately; Cross-over connection transmission line joint 4 in parallel between the first cruciform joint 2 in parallel, the second cruciform joint 7 in parallel the 3rd symmetric position port separately, a remaining port connects respectively output input transmission line 1 and output transmission line 8 separately, is combined to form 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, cascade transmission line joint and transmission line in parallel joint transmission line element form 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 reflection zero in filter working band, the two on frequency axis in abutting connection with but not overlapping, thereby there is one-sided elliptic function filter characteristic.Input signal is from input transmission line 1 feed-in first cruciform joint 2 in parallel, be reflected back toward input transmission line at this part signal 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 is via cascade transmission line joint 3, two paths of signals is at the second cruciform joint in parallel 7 places, and part signal is reflected again because of impedance mismatching, after all the other signals are synthetic, exports from output transmission line 8.The first open circuited transmission line minor matters 5, the second open circuited transmission line minor matters 6 are for adjusting input and output side reflected signal amplitude and phase place.At characteristic impedance and the filter cutoff frequency f of given input transmission line 1 and output transmission line 8
cunder condition, by selecting the linear electrical parameter of cascade transmission line joint 3, transmission line in parallel joint 4 and open circuited transmission line minor matters 5,6, adjust respectively amplitude and the phase place of two paths of signals and input and output reflected signal, can be at given filter cutoff frequency f
cnear, produce at least two frequencies all higher than f
cfinite frequency reflection zero, and frequency band shaping filter passband in its vicinity produces at least two frequencies all lower than f simultaneously
cnon-zero finite frequency transmission zero, and frequency band shaping filter stopband in its vicinity, passband and stopband are at cut-off frequency f
cupper adjacency, thus realize f
cnear high-pass type elliptic function filter characteristic; Or at given filter cutoff frequency f
cupper, produce at least two frequencies all lower than f
cnon-zero finite frequency reflection zero, and frequency band shaping filter passband in its vicinity produces at least two frequencies all higher than f simultaneously
cfinite frequency transmission zero, and frequency band shaping filter stopband in its vicinity, passband and stopband are at cut-off frequency f
cupper adjacency, thus realize f
cnear Low-Pass Filter elliptic function filter characteristic.
Initial parameter can be selected as follows: at given filter cutoff frequency f
con, cascade transmission line joint 3 has the electrical length that is less than 180 °, transmission line joint 4 in parallel has the electrical length that is greater than 270 ° but be 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 greater than 180 ° but be less than 360 °.By design suitable transmission line element characteristic impedance and electrical length in above scope, can realize f
cnear one-sided 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 parameters are identical, in transmission zero frequency f
s1upper 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 is via cascade transmission line joint 3, at frequency transmission f at zero point
s2upper, the transmission coefficient amplitude of this two paths equates, single spin-echo, and the two paths of signals after transmission is cancelled out each other at the second cruciform joint in parallel 7 places, produces second transmission zero.
Frequency input signal is lower than transmission zero f
s1time, the first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 electrical length are between 180 °～270 °, be equivalent to capacitive parallel reactance, and be equivalent to series inductance after cascade transmission line joint 3 and 4 combinations of transmission line in parallel joint, these four elements combinations form Π type low-pass network, can be equivalent to a right hand transmission line joint.Suitably select linear electrical parameter, can be less than transmission zero f
s1at least two nonzero frequency f
p1, f
p2on make the impedance of this right hand transmission line joint with input transmission line 1 and export transmission line 8 to mate, form two reflection zeros, and make f
p1<f
p2<f
s2<f
s1thereby, make filter there is Low-Pass Filter elliptic function transmission characteristic, its cut-off frequency is at f
s1near.Frequency input signal is higher than transmission zero f
s1time, the first open circuited transmission line minor matters 5 and the second open circuited transmission line minor matters 6 electrical length are between 270 °～360 °, be equivalent to perceptual parallel reactance, and be equivalent to series capacitance after cascade transmission line joint 3 and 4 combinations of transmission line in parallel joint, these four elements combinations form Π type high pass network, can be equivalent to left hand transmission line joint, suitably select linear electrical parameter, can be higher than transmission zero f
s1at least two frequency f
p3, f
p4on make the impedance of this left hand transmission line joint and input transmission line 1 and 8 impedance matchings of output transmission line, form two reflection zeros, and make f
s1<f
s2<f
p3<f
p4thereby, filter is had and is approaching f
s1cut-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.
Circuit design does not limit transmission line element transmission line form used; The first cruciform joint 2, the second in parallel 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 are interconnected, to dwindle filter volume size.
Fig. 2 has described reflection and the transfer curve of the one-sided elliptic function line filter of a typical microstrip transmission line parallel connection type circuit, can clearly see in stopband and have 3 transmission zeros in passband, have two reflection zeros from scheming.
The concrete enforcement of the present invention can adopt following steps: first according to system applies requirement, select suitable transmission line way of realization.Consider the integrated plane such as microstrip line, the strip line class transmission line of selecting of filter, consideration low-loss should be selected the low loss lines such as waveguide, but need consideration and prime or late-class circuit to adopt same transmission line form, to avoid volume size that transport mode translations is brought to increase and to introduce thus extra loss.Secondly,, according to application demand, determine cut-off frequency f
c, passband and bandwidth of rejection, passband and bandwidth of rejection f
cbe normalized to relative bandwidth, its value should be 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, determine each element transmission line parameter.Also can complete design of filter by artificial iterative computation, method is as follows: set two transmission zero f in filter stop bend
s1, f
s2, two reflection zeros in passband are f for left side elliptic function filter
p1, f
p2, be f to right side elliptic function filter
p3, f
p4, set up equation group by the formation transmission zero described in filter operation principle and the condition of reflection zero, solve the impedance and the electrical length that obtain each transmission line element.
Determine after design parameter, in Electromagnetic Simulation software environment, set up the structural model of filter, carry out final design checking by electromagnetic-field simulation.
Claims (10)
1. the one-sided elliptic function line filter of parallel connection type, comprise: input and output transmission line, cruciform joint in parallel, open circuited transmission line minor matters, cascade transmission line joint and transmission line in parallel joint, it is characterized in that: each transmission line joint and transmission line minor matters adopt two-conductor transmission line in interior various high frequency transmission line forms, cruciform joint in parallel is to realize the four port transmission kind of thread elements that any four transmission lines of the same type are connected in parallel, two cruciform joints (2 in parallel, 7) mirror image symmetry, be connected to the two ends of cascade transmission joint (3), and connect respectively the first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) in a symmetrical ports separately, cross-over connection transmission line joint in parallel (4) between two cruciform joints in parallel the 3rd symmetrical ports separately, the 4th port connects respectively output input transmission line (1) and output transmission line (8) separately, input signal is from input transmission line (1) feed-in the first cruciform joint in parallel (2), part signal is reflected back toward input transmission line at this because of impedance mismatching, all the other signals are divided into two-way transmission, (4) are saved through transmission line in parallel in one tunnel, another road is via cascade transmission line joint (3), two paths of signals is reflected because of impedance mismatching again at the second cruciform joint in parallel (7), after all the other signals are synthetic, export from output transmission line (8), the first open circuited transmission line minor matters (5), the second open circuited transmission line minor matters (6) are adjusted input and output side reflected signal amplitude and phase place, at characteristic impedance and the filter cutoff frequency f of any given input transmission line (1) and output transmission line (8)
cunder condition, by selecting the linear electrical parameter of cascade transmission line joint (3), transmission line in parallel joint (4) and open circuited transmission line minor matters (5,6), adjust respectively amplitude and the phase place of two-way signal transmission, and the amplitude of input and output reflected signal and phase place, produce at least two upper frequencies all below or above f
cnon-zero finite frequency reflection zero, and at its f
cnear frequency band shaping filter passband produces at least two frequencies all higher or lower than f simultaneously
cnon-zero finite frequency transmission zero, and at f
cnear frequency band shaping filter stopband, thus realize f
cnear one-sided elliptic function low pass or high-pass filtering characteristic.
2. the one-sided elliptic function line filter of parallel connection type according to claim 1, is characterized in that: at given filter cutoff frequency f
con, cascade transmission line joint (3) has the electrical length that is less than 180 °, transmission line joint in parallel (4) has the electrical length that is greater than 270 ° but be less than 360 °, 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 greater than 180 ° but be less than 360 °.
3. the one-sided elliptic function line filter of parallel connection type according to claim 1, is characterized 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
s1upper electrical length is 270 °, is equivalent to shorted to earth, forms a transmission zero f
s1.
4. the one-sided elliptic function line filter of parallel connection type according to claim 1, it is characterized in that: input signal is after the first cruciform joint in parallel (2) is located to be partly reflected, remainder is divided into two-way, respectively via cascade transmission line joint (3) and (4) the two paths transmission of transmission line in parallel joint, in frequency f
s2upper, the transmission coefficient amplitude of this two paths equates, single spin-echo, and the two paths of signals after transmission is located to cancel out each other at the second cruciform joint in parallel (7), produces second transmission zero f
s2.
5. the one-sided elliptic function line filter of parallel connection type according to claim 1, is characterized in that: frequency is lower than transmission zero f
s1time, the first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) electrical length are between 180 °～270 °, be equivalent to capacitive parallel reactance, and be equivalent to series inductance after cascade transmission line joint (3) and transmission line in parallel joint (4) combination, these four elements combinations form Π type low-pass network, can be equivalent to a right hand transmission line joint.
6. the one-sided elliptic function line filter of parallel connection type according to claim 5, is characterized in that: suitably select linear electrical parameter, be less than transmission zero f
s1two nonzero frequency f
p1, f
p2on make the impedance of this right hand transmission line joint with input transmission line (1) and export transmission line (8) to mate, form two reflection zeros, and make f
p1<f
p2<f
s2<f
s1thereby, filter is had and is approaching f
s1cut-off frequency near right side elliptic function transmission characteristic.
7. the one-sided elliptic function line filter of parallel connection type according to claim 1, is characterized in that: frequency input signal is higher than transmission zero f
s1time, the first open circuited transmission line minor matters (5) and the second open circuited transmission line minor matters (6) electrical length are between 270 °～360 °, be equivalent to perceptual parallel reactance, and be equivalent to series capacitance after cascade transmission line joint (3) and transmission line in parallel joint (4) combination, these four elements combinations form Π type high pass network, are equivalent to a left hand transmission line joint.
8. the one-sided elliptic function line filter of parallel connection type according to claim 7, is characterized in that: suitably select linear electrical parameter, and can be higher than transmission zero f
s1two finite frequency f
p3, f
p4on make the impedance of this left hand transmission line joint with input transmission line (1) and export transmission line (8) impedance matching, form two reflection zeros, and make f
s1<f
s2<f
p3<f
p4thereby, filter is had and is approaching f
s1cut-off frequency near left side elliptic function transmission characteristic.
9. the one-sided elliptic function line filter of parallel connection type according to claim 1, is characterized in that: in stopband, have the limited transmission zero of two or more non-zeros, have the limited reflection zero of two or more non-zeros in passband.
10. the one-sided elliptic function line filter of parallel connection type according to claim 1, it is characterized in that: input and output transmission line, cruciform joint in parallel, short-circuited transmission line minor matters, cascade transmission line joint and transmission line in parallel joint transmission line element form 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 reflection zero in filter working band, the two on frequency axis in abutting connection with but not overlapping, thereby there is one-sided elliptic function filter characteristic.
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| CN106788313A (en) * | 2017-02-13 | 2017-05-31 | 石家庄创天电子科技有限公司 | A kind of feed circuit of wave filter and the device based on the feed circuit |
| CN110197940A (en) * | 2019-06-13 | 2019-09-03 | 中国电子科技集团公司第二十九研究所 | A kind of improved barrette line filter and its operating method |
| CN112864555A (en) * | 2021-01-25 | 2021-05-28 | 南通大学 | Suspension strip line cavity combiner with uniform impedance branch loading |
| CN112909464A (en) * | 2021-01-25 | 2021-06-04 | 中天通信技术有限公司 | Microstrip combiner with uniform impedance branch loading |
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| WO2017055989A1 (en) * | 2015-09-30 | 2017-04-06 | International Business Machines Corporation | Multimode josephson parametric converter |
| GB2558830A (en) * | 2015-09-30 | 2018-07-18 | Ibm | Multimode josephson parametric converter |
| GB2558830B (en) * | 2015-09-30 | 2020-05-13 | Ibm | Multimode josephson parametric converter |
| CN106788313A (en) * | 2017-02-13 | 2017-05-31 | 石家庄创天电子科技有限公司 | A kind of feed circuit of wave filter and the device based on the feed circuit |
| 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 |
| CN110197940A (en) * | 2019-06-13 | 2019-09-03 | 中国电子科技集团公司第二十九研究所 | A kind of improved barrette line filter and its operating method |
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