CN105762466A - Two electrically tunable passband-equipped three frequency band pass filter - Google Patents
Two electrically tunable passband-equipped three frequency band pass filter Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
The invention discloses a two electrically tunable passband-equipped three frequency band pass filter comprising microstrip line structure arranged on an upper layer, a dielectric substrate arranged on a middle layer and a grounded metal plate as well as a metal via hole that are arranged on a lower layer, wherein the microstrip line structure comprises a pair of multi-mode resonators that are symmetric in a left-and-right manner and a pair of input/output feeder lines that are symmetric in a left-and-right manner, each multi-mode resonator comprises a split ring resonator and a branch structure, open parts of split ring resonators are connected via a group of varactors that are connected in series, the branch structure is shaped like an inversed E and is loaded at the center of the split ring resonator, a varactor is loaded at the tail end of a branch line arranged at one side of the branch structure, the lower end of a central branch line is bent twice, and each input/output feeder line comprises a section of a terminal short circuit microstrip line and a section of a terminal open circuit microstrip line. A first pass band and a second pass band of the three frequency band pass filter are independently electrically tunable, a third fixed pass band is controllable, and the three pass bands are controllable in bandwidth.
Description
Technical field
The present invention relates to a kind of three band-pass filters, especially a kind of be applied to there are two can adjusting three band-pass filters of passband by electricity of three frequency restructural radio-frequency front-end systems, belong to technical field of micro communication.
Background technology
Develop rapidly in process in modern wireless communication systems, to can compatible multiple frequency ranges, it is achieved the system demand of multiple business is increasing.And radio frequency electrically adjusted wave filter is as the important component part of radio-frequency front-end system, and have that volume is little, cost is low and the advantage such as motility, be increasingly subject to pay attention to.Therefore, compatible multiple frequency range simultaneously, bandwidth is controlled, and mid frequency can the band filter of flexible more attractive, the research of three frequency band variable band-pass filters is significant.
One-segment tunable filter has currently obtained and has studied widely, also part double frequency variable band-pass filter is had to be in the news, but owing to three frequency band tunable filter design difficulty are big, it is more difficult to each passband of independent control, so being seldom related to the report of three frequency band tunable filters of more than two frequency range.
2013, " the Novelreconfigurablemultiple-bandquasi-ellipticbandpassfi lterusingdefectedgroundstructure " that Chan-KeongChio et al. delivers in MicrowaveSymposiumDigest (IMS) meeting, propose the three frequency range switchable filter based on defect ground structure, this wave filter arbitrarily can switch in three working frequency range, but can not realize the continuous fast tunable of mid frequency.
2015, RobertoG ó mez-Garc í a et al. has delivered " Reconfigurablemulti-bandmicrowavefilters " on IEEETransactiononMTT, proposing the multifrequency variable band-pass filter of a kind of more than two frequency range, but range of accommodation is less, volume is bigger.
In sum, the article delivered or patent relate to one-segment variable band-pass filter more, and small part relates to double frequency variable band-pass filter, relate to the report of three frequency range variable band-pass filters then few, institute's extracting method and structure and the limited capacity realized.The mid frequency of the passband not requiring nothing more than wave filter in practical application is controlled, also requires that the bandwidth of wave filter is also controlled.Further, along with developing rapidly of mobile communication system, the demand of the miniaturization of device is also increasing, therefore three frequency band variable band-pass filters of Highgrade integration have bigger application prospect.
Summary of the invention
The invention aims to solve the defect of above-mentioned prior art, provide a kind of have two can electricity adjust passband three band-pass filters, first and second passband of this wave filter is independently can to adjust by electricity, 3rd fixed passband is controlled, and the bandwidth of three passbands is also controlled, due to only with a multimode resonator, so having bigger advantage in miniaturization.
The purpose of the present invention can be passed through to adopt the following technical scheme that and reach:
A kind of have two can electricity adjust passband three band-pass filters, microstrip line construction including upper strata, the medium substrate in middle level, the grounding plate of lower floor and metal throuth hole, described metal throuth hole sequentially passes through microstrip line construction, medium substrate and grounding plate, make to be connected by medium substrate between microstrip line construction with grounding plate, it is characterized in that: described microstrip line construction includes a pair symmetrical multimode resonator and a pair symmetrical input/output feed line, each multimode resonator includes a split-ring resonator and a minor matters structure, the opening part of described split-ring resonator is connected by the varactor of one group of series connection, described minor matters structure is " towel " font, and it is carried in the center of split-ring resonator.
As a kind of preferred version, in the middle of the varactor of one group of series connection of the opening part of described split-ring resonator, connect the first direct voltage source by a biasing resistor.
As a kind of preferred version, the minor matters line lower end, center of described minor matters structure, through twice bending, adds the degree of freedom that in band, coupling controls.
As a kind of preferred version, minor matters structure in the multimode resonator on the left side is the first minor matters structure, minor matters structure in the multimode resonator on the right is the second minor matters structure, and the right side minor matters line end of described first minor matters structure and the left side minor matters line end of the second minor matters structure load a varactor respectively.
As a kind of preferred version, the right side minor matters line end of described first minor matters structure and the left side minor matters line end of the second minor matters structure also load a fixed capacity respectively；Wherein, before the fixed capacity that the right side minor matters line end of described first minor matters structure loads is positioned at the varactor of right side minor matters line end loading of the first minor matters structure, before the fixed capacity that the left side minor matters line end of described second minor matters structure loads is positioned at the varactor of left side minor matters line end loading of the second minor matters structure.
As a kind of preferred version, between varactor and fixed capacity that the right side minor matters line end of described first minor matters structure loads, and connect the second direct voltage source respectively through a biasing resistor between varactor and the fixed capacity of the left side minor matters line end loading of the second minor matters structure.
As a kind of preferred version, split-ring resonator in the multimode resonator on the left side is the first split-ring resonator, split-ring resonator in the multimode resonator on the right is the second split-ring resonator, and the center of described first split-ring resonator and the second split-ring resonator loads a ground connection radio-frequency choke respectively.
As a kind of preferred version, the pair of symmetrical input/output feed line respectively the first input/output feed line and the second input/output feed line, described first input/output feed line and the second input/output feed line all include a section termination short-circuit micro-band line and section termination open circuit microstrip line；
Described first input/output feed line is positioned on the left of the multimode resonator on the left side, in the first input/output feed line, the short-circuit end of terminal short circuit microstrip line is positioned at the top of the first split-ring resonator, and the open end of open-end microstrip line is positioned at the lower section of the first split-ring resonator；
Described second input/output feed line is positioned on the right side of the multimode resonator on the right, in the second input/output feed line, the short-circuit end of terminal short circuit microstrip line is positioned at the top of the second split-ring resonator, and the open end of open-end microstrip line is positioned at the lower section of the second split-ring resonator.
As a kind of preferred version, the left side of described first input/output feed line is provided with the first input/output end port, and the right side of described second input/output feed line is provided with the second input/output end port.
As a kind of preferred version, described first input/output end port and the second input/output end port are respectively provided with a fixed capacity.
The present invention has following beneficial effect relative to prior art:
1, present invention employs a pair symmetrical multimode resonator, each multimode resonator includes a split-ring resonator and " towel " font minor matters structure, and split-ring resonator and " towel " font minor matters structure are all loaded with varactor, by this multimode resonator achieved there are two can the passband that regulates of independent electrical, three band band-pass filters that the mid frequency of three frequency bands is controlled with bandwidth, solve and relate to restructural single band bandpass filter more, the variable band-pass filter relating to being applied to three frequency systems is relatively fewer, institute's extracting method and structure and the problem of limited capacity realized.
2, the present invention design have two can electricity adjust passband three band band-pass filters, due to only with a pair multimode resonator (two multimode resonators), there is bigger advantage in size, meet the wireless communication system requirement to device miniaturization in practical application.
Accompanying drawing explanation
Fig. 1 is the multimode resonator structure chart of the embodiment of the present invention 1.
Fig. 2 is the strange mould equivalent circuit diagram of the multimode resonator of the embodiment of the present invention 1.
Fig. 3 is the even mould equivalent circuit diagram of the multimode resonator of the embodiment of the present invention 1.
Fig. 4 is the strange mould equivalent circuit diagram of Fig. 3 circuit.
Fig. 5 is the even mould equivalent circuit diagram of Fig. 3 circuit.
Fig. 6 is three band-pass filter structure charts of the embodiment of the present invention 2.
Second and third passband of three band-pass filters that Fig. 7 is the embodiment of the present invention 3 is fixed, the first adjustable S of passband21Simulation curve figure.
Second and third passband of three band-pass filters that Fig. 8 is the embodiment of the present invention 3 is fixed, the first adjustable S of passband11Simulation curve figure.
Three band-pass filter first and third passbands that Fig. 9 is the embodiment of the present invention 3 are fixed, the second adjustable S of passband21Simulation curve figure.
Three band-pass filter first and third passbands that Figure 10 is the embodiment of the present invention 3 are fixed, the second adjustable S of passband11Simulation curve figure.
Wherein, 1-microstrip line construction, 2-the first split-ring resonator, 3-the first minor matters structure, 4-the second split-ring resonator, 5-the second minor matters structure, 6-ground connection radio-frequency choke, 7-the first input/output feed line, 8-the second input/output feed line.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1:
As it is shown in figure 1, the present embodiment proposes a kind of multimode resonator, this multimode resonator includes a split-ring resonator and a minor matters structure, and the opening part (two opening terminals) of described split-ring resonator is with a varactor CV1Coupling together, described minor matters structure is " towel " font, and is carried in the center of split-ring resonator, and the both sides minor matters line end of minor matters structure loads a varactor C respectivelyV2, the multimode resonator so proposed forms " a hanging " font on the whole, owing to this multimode resonator is symmetrical about PP' plane, therefore can use analysis method of odd-even model that it is carried out pattern analysis.
For the ease of analyzing, it is assumed that the characteristic admittance Y of microstrip line4=4Y1=2Y2=2Y3, physical length L1+L2=L3, as shown in Figures 2 and 3, the respectively strange mould of multimode resonator and even mould equivalent circuit.From figure 2 it can be seen that the strange mould equivalent circuit of multimode resonator is equivalent to an open end is loaded with varactor CV1Quarter-wave resonance device, its resonant frequency f1With L1+ΔL1It is inversely proportional to, wherein Δ L1For varactor CV1The microstrip line length of equivalence；Therefore, resonant frequency f1Can by varactor CV1It is adjusted.As can be seen from Figure 3, the even mould equivalent circuit of resonator is also symmetrical, therefore, odd-even mode analytical method can be adopted further to be analyzed, the strange mould of Fig. 3 circuit and even mould equivalent circuit are respectively as shown in Figure 4 and Figure 5, equivalent circuit shown in Fig. 4 is traditional quarter-wave resonance device, resonant frequency f3Physical length L with microstrip line3(namely L1+L2) be inversely proportional to, the equivalent circuit shown in Fig. 5 is that one end is loaded with varactor CV2Half-wave resonator, its resonant frequency f2With L3+L4+L5+ΔL2It is inversely proportional to, wherein Δ L2For varactor CV2The microstrip line length of equivalence；Therefore, resonant frequency f3Can varactor CV2By being adjusted.
Embodiment 2:
According to " W.TangandJ.-S.Hong, " Varactor-tuneddual-modebandpassfilters ", IEEETrans.Microw.TheoryTech., vol.58, no.8, pp.2213 2219, Aug.2010. " analysis, as long as it is symmetrical about input/output end port to load minor matters load(ing) point on main transmission line, the varactor no matter being carried in minor matters is asymmetrical loading, or asymmetrical load, the design effect reached is the same, in order to reduce the use number of varactor, by the varactor C on the left of the minor matters structure in the multimode resonator of above-described embodiment 1V2Remove, form the asymmetrical loading of varactor in minor matters structure.
As shown in Figure 6, three band-pass filters of the present embodiment include the microstrip line construction 1 on upper strata, the medium substrate (not shown) in middle level, the grounding plate (not shown) of lower floor and metal throuth hole (not shown), microstrip line construction 1 and grounding plate are all attached on medium substrate, described metal throuth hole sequentially passes through microstrip line construction 1, medium substrate and grounding plate, make to be connected by medium substrate between microstrip line construction 1 and grounding plate, described microstrip line construction 1 includes a pair symmetrical multimode resonator and a pair symmetrical input/output feed line, whole microstrip line construction 1 presents symmetrical；
In the pair of symmetrical multimode resonator, the multimode resonator on the left side includes the first split-ring resonator 2 and the first minor matters structure 3, the multimode resonator on the right includes the second split-ring resonator 4 and the second minor matters structure 5, the varactor C that the opening part of described first split-ring resonator 2 and the second split-ring resonator 4 is connected by a group (two)V1Connect, described first minor matters structure 3 and the second minor matters structure 5 are all in " towel " font, wherein the first minor matters structure 3 is carried in the center of the first split-ring resonator 2, second minor matters structure 5 is carried in the center of the second split-ring resonator 4 of the first split-ring resonator 2, the center of described first split-ring resonator 2 and the second split-ring resonator 4 loads a ground connection radio-frequency choke 6 respectively, ground connection radio-frequency choke 6 is as DC earthing use, and is prevented from radiofrequency signal and is shorted to the ground of DC source；
The varactor C of one group of series connection of the opening part of described first split-ring resonator 2V1Centre, and the varactor C of one group of series connection of the opening part of the first split-ring resonator 2V1The first direct voltage source V is met each through a biasing resistorCC1, the first direct voltage source VCC1Can be varactor CV1Thering is provided bias voltage, this biasing resistor also functions to the effect of radio frequency choke simultaneously；
The minor matters line lower end, center of described first minor matters structure 3 and the second minor matters structure 5, through twice bending, adds the degree of freedom that in band, coupling controls, and the right side minor matters line end of the first minor matters structure 3 loads a fixed capacity CDCWith a varactor CV2, the left side minor matters line end of the second minor matters structure 5 also loads a fixed capacity CDCWith a varactor CV2, fixed capacity CDCIt is positioned at varactor CV2Before, serve every straight effect；
The varactor C that the right side minor matters line end of described first minor matters structure 3 loadsV2With fixed capacity CDCBetween, and the varactor C that the left side minor matters line end of the second minor matters structure 5 loadsV2With fixed capacity CDCBetween meet the second direct voltage source V respectively through a biasing resistorCC2, the second direct voltage source VCC2Can be varactor CV2Thering is provided bias voltage, this biasing resistor also functions to the effect of radio frequency choke simultaneously；
The pair of symmetrical input/output feed line is the first input/output feed line 7 and the second input/output feed line 8 respectively, described first input/output feed line 7 and the second input/output feed line 8 all include a section termination short-circuit micro-band line and section termination open circuit microstrip line, add the degree of freedom extracting external sort factor；
Described first input/output feed line 7 is positioned on the left of the multimode resonator on the left side, in the first input/output feed line 7, the short-circuit end of terminal short circuit microstrip line is positioned at above in the of the 2 of the first split-ring resonator, and the open end of open-end microstrip line is positioned at the lower section of the first split-ring resonator 2；Described second input/output feed line 8 is positioned on the right side of the multimode resonator on the right, in the second input/output feed line 8, the short-circuit end of terminal short circuit microstrip line is positioned at the top of the second split-ring resonator 4, and the open end of open-end microstrip line is positioned at the lower section of the second split-ring resonator 4；
The left side of described first input/output feed line 7 is provided with the first input/output end port Port1, the right side of described second input/output feed line 8 is provided with the second input/output end port Port2, and the first input/output end port Port1 and the second input/output end port Port2 is respectively provided with a fixed capacity Cin, fixed capacity CinMay also be used for regulating external sort factor.
First passband of three band-pass filters of the present embodiment is by the resonant frequency f of the equivalent quarter-wave resonance device in Fig. 31Formed, with the microstrip line length L in Fig. 61+L2+L3With varactor CV1Relevant, it is possible to by varactor CV1Bias voltage (the first direct voltage source VCC1For varactor CV1Bias voltage is provided) carry out electricity adjustment, it is evident that and the coefficient of coup of the first passband can by coupling length L1With coupling gap S1It is controlled；3rd passband of three band-pass filters is by the resonant frequency f of the traditional quarter-wave resonance device in Fig. 43Formed, with the microstrip line length L in Fig. 61+L2+L3+L4+L5+L6+L7Relevant, not with varactor CV1And CV2Change and change, belong to fixed passband；It can be seen that the coefficient of coup of the 3rd passband and coupling length L1、L7With coupling gap S1、S2Relevant, work as L1And S1After determining, namely determining the coefficient of coup of the first passband, the coefficient of coup of the 3rd passband can pass through L7And S2Independent regulation；Second passband of three band-pass filters is by the resonant frequency f of the equivalent half-wave resonator in Fig. 52Being formed, not only the physical length of microstrip lines all with Fig. 6 is relevant, and by varactor CV2Impact, not by varactor CV1Impact；Therefore, the second passband can pass through varactor CV2Bias voltage (the second direct voltage source VCC2For varactor CV2Bias voltage is provided) carry out independent electrical adjustment, and the coefficient of coup of the second passband and coupling length L1、L7、L9With coupling gap S1、S2、S3Relevant, work as L1、L7、S1And S2Determining, namely determine the first passband and the coefficient of coup of the 3rd passband, then the coefficient of coup of the second passband can by L9And S3Independent regulation.To sum up, it is proposed to three band-pass filters mid frequency can independent regulation, first and second passband can realize independent electricity adjustment, and, to a certain extent, in the band of three passbands, the coefficient of coup is individually controllable.
By analyzing above it can be seen that the present invention is by implementing a pair novel multimode resonator, adopt suitable feed structure, it is achieved that mid frequency and bandwidth are all controlled, and first and second passband can electric three band band-pass filters adjusted.What the present invention comprised is that the mid frequency with two passbands independently can be adjusted by electricity, and the design principle of three band band-pass filters that bandwidth is controlled, described design structure can be micro-strip, coaxial line or other structures.
Embodiment 3:
Three band-pass filter structures as shown in Figure 6, in the present embodiment use the AdvancedDesignSystem that business electromagnetic simulation software is Agilent company (ADS).Three band-pass filters select processing dielectric constant be 2.55, thickness is 0.8mm, loss angle tangent be 0.0029 medium substrate on, the concrete size of filter construction shown in Fig. 6 is as shown in table 1 below；Fixed capacity adopts the product of Murata, varactor C in the present embodimentV2Fixed capacity C aboveDCServe every straight effect, CDC=7pF, and the fixed capacity C of input/output end portin=2.2pF.CV1Select the varactor of the SMV1405-074 model of Skyworks company, CV2Select the varactor of the SMV1405-079LF model of Skyworks company.
Table 1 three band band-pass filter size
Simulation curve such as Fig. 7～Figure 10 respectively three band-pass filters.Shown in Fig. 7 and Fig. 8, respectively second and third passband is fixed, the first adjustable S of passband21(S21Represent the input port forward transmission coefficient to output port) and S11(|S11| represent the return loss of input port) simulation curve, can be seen that, the mid frequency of the second passband and the 3rd passband is separately fixed at 2.65GHz and 3.5GHz place, the mid frequency of the first passband can be adjusted to 1.73GHz by 1.25GHz, relative adjustable extent is 32.2%, insertion loss is 1.39-1.97dB, and return loss is more than 15dB；In adjustment process, the 3dB absolute bandwidth of the first passband is 135 ± 18MHz；Shown in Fig. 9 and Figure 10, respectively first and third passband is fixed, the second adjustable S of passband21And S11Simulation curve, it can be seen that first and the 3rd the mid frequency of passband be separately fixed at 1.58GHz and 3.5GHz place, the mid frequency of the second passband can be adjusted to 2.72GHz by 2.41GHz, relative accommodation ranges for 12.1%, and insertion loss is 2.13dB-2.93dB, and return loss is more than 15dB；In adjustment process, the 3dB absolute bandwidth of the second passband is 129 ± 10MHz, and the 3dB absolute bandwidth of the 3rd passband is 150MHz, and wave filter general performance goes out good performance.
In sum, the proposing of novelty of the present invention has two can adjust three band band-pass filters of passband by electricity, the part having filled up current reconfigurable filter technical research is blank, improve the integrated level of system, this wave filter not only have two can electricity regulate passband, the mid frequency of its three frequency bands is all individually controllable, and bandwidth is also controlled, more motility, it is possible to meet the application of existing three frequency range restructural wireless communication systems better.
The above; it is only patent preferred embodiment of the present invention; but the protection domain of patent of the present invention is not limited thereto; any those familiar with the art is in the scope disclosed in patent of the present invention; technical scheme and inventive concept thereof according to patent of the present invention are equal to replacement or are changed, and broadly fall into the protection domain of patent of the present invention.
Claims (10)
1. one kind have two can electricity adjust passband three band-pass filters, microstrip line construction including upper strata, the medium substrate in middle level, the grounding plate of lower floor and metal throuth hole, described metal throuth hole sequentially passes through microstrip line construction, medium substrate and grounding plate, make to be connected by medium substrate between microstrip line construction with grounding plate, it is characterized in that: described microstrip line construction includes a pair symmetrical multimode resonator and a pair symmetrical input/output feed line, each multimode resonator includes a split-ring resonator and a minor matters structure, the opening part of described split-ring resonator is connected by the varactor of one group of series connection, described minor matters structure is " towel " font, and it is carried in the center of split-ring resonator.
2. according to claim 1 a kind of have two and can adjust three band-pass filters of passband by electricity, it is characterised in that: connects the first direct voltage source by a biasing resistor in the middle of the varactor of one group of the opening part of described split-ring resonator series connection.
3. according to claim 1 a kind of have two can electricity adjust passband three band-pass filters, it is characterised in that: the minor matters line lower end, center of described minor matters structure is through twice bending.
4. according to claim 1 a kind of have two can electricity adjust passband three band-pass filters, it is characterized in that: the minor matters structure in the multimode resonator on the left side is the first minor matters structure, minor matters structure in the multimode resonator on the right is the second minor matters structure, and the right side minor matters line end of described first minor matters structure and the left side minor matters line end of the second minor matters structure load a varactor respectively.
5. according to claim 4 a kind of have two can electricity adjust passband three band-pass filters, it is characterised in that: the right side minor matters line end of described first minor matters structure and the left side minor matters line end of the second minor matters structure also respectively load a fixed capacity；Wherein, before the fixed capacity that the right side minor matters line end of described first minor matters structure loads is positioned at the varactor of right side minor matters line end loading of the first minor matters structure, before the fixed capacity that the left side minor matters line end of described second minor matters structure loads is positioned at the varactor of left side minor matters line end loading of the second minor matters structure.
6. according to claim 5 a kind of have two can electricity adjust passband three band-pass filters, it is characterized in that: between varactor and fixed capacity that the right side minor matters line end of described first minor matters structure loads, and connect the second direct voltage source respectively through a biasing resistor between varactor and the fixed capacity of the left side minor matters line end loading of the second minor matters structure.
7. according to claim 1 a kind of have two can electricity adjust passband three band-pass filters, it is characterized in that: the split-ring resonator in the multimode resonator on the left side is the first split-ring resonator, split-ring resonator in the multimode resonator on the right is the second split-ring resonator, and the center of described first split-ring resonator and the second split-ring resonator loads a ground connection radio-frequency choke respectively.
8. according to claim 7 a kind of have two can electricity adjust passband three band-pass filters, it is characterized in that: the pair of symmetrical input/output feed line respectively the first input/output feed line and the second input/output feed line, described first input/output feed line and the second input/output feed line all include a section termination short-circuit micro-band line and section termination open circuit microstrip line；
Described first input/output feed line is positioned on the left of the multimode resonator on the left side, in the first input/output feed line, the short-circuit end of terminal short circuit microstrip line is positioned at the top of the first split-ring resonator, and the open end of open-end microstrip line is positioned at the lower section of the first split-ring resonator；
Described second input/output feed line is positioned on the right side of the multimode resonator on the right, in the second input/output feed line, the short-circuit end of terminal short circuit microstrip line is positioned at the top of the second split-ring resonator, and the open end of open-end microstrip line is positioned at the lower section of the second split-ring resonator.
9. according to claim 8 a kind of have two can electricity adjust passband three band-pass filters, it is characterized in that: the left side of described first input/output feed line is provided with the first input/output end port, and the right side of described second input/output feed line is provided with the second input/output end port.
10. according to claim 9 a kind of have two can electricity adjust passband three band-pass filters, it is characterised in that: described first input/output end port and the second input/output end port are respectively provided with a fixed capacity.
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| CN108039871A (en) * | 2017-12-04 | 2018-05-15 | 广东技术师范学院 | A kind of restructural three band-pass filter of frequency band of microwave |
| CN108574130A (en) * | 2017-03-13 | 2018-09-25 | 电子科技大学 | Micro-strip filter circuit, micro-strip duplexer and related electronic devices |
| CN114142195A (en) * | 2021-11-30 | 2022-03-04 | 上海航天电子通讯设备研究所 | Microstrip line filter |
| CN114759323A (en) * | 2021-11-12 | 2022-07-15 | 电子科技大学 | Phase shifter integrating reconfigurable filtering and amplitude control |
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Cited By (7)
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| CN108574130A (en) * | 2017-03-13 | 2018-09-25 | 电子科技大学 | Micro-strip filter circuit, micro-strip duplexer and related electronic devices |
| CN107086340A (en) * | 2017-04-18 | 2017-08-22 | 电子科技大学 | A kind of tri-band bandpass filter with high selectivity pass band tunable |
| CN107086340B (en) * | 2017-04-18 | 2019-03-19 | 电子科技大学 | A kind of tri-band bandpass filter with highly selective pass band tunable |
| CN108039871A (en) * | 2017-12-04 | 2018-05-15 | 广东技术师范学院 | A kind of restructural three band-pass filter of frequency band of microwave |
| CN114759323A (en) * | 2021-11-12 | 2022-07-15 | 电子科技大学 | Phase shifter integrating reconfigurable filtering and amplitude control |
| CN114759323B (en) * | 2021-11-12 | 2022-09-09 | 电子科技大学 | Phase shifter integrating reconfigurable filtering and amplitude control |
| CN114142195A (en) * | 2021-11-30 | 2022-03-04 | 上海航天电子通讯设备研究所 | Microstrip line filter |
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| CN105762466B (en) | 2019-01-18 |
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