CN101599564A - Controllable electromagnetic coupling microstrip split-ring resonator filter - Google Patents
Controllable electromagnetic coupling microstrip split-ring resonator filter Download PDFInfo
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- CN101599564A CN101599564A CNA200910040985XA CN200910040985A CN101599564A CN 101599564 A CN101599564 A CN 101599564A CN A200910040985X A CNA200910040985X A CN A200910040985XA CN 200910040985 A CN200910040985 A CN 200910040985A CN 101599564 A CN101599564 A CN 101599564A
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Abstract
The present invention is a kind of controllable electromagnetic coupling microstrip split-ring resonator filter, comprises input microstrip line, output microstrip line and micro-strip resonantor group, and the micro-strip resonantor group is one or more controllable electromagnetic coupling filter units; Controllable electromagnetic coupling filter unit is made up of two resonators that intercouple, and the effective length of each resonator is half operation wavelength of controllable electromagnetic coupling microstrip split-ring resonator filter; In same controllable electromagnetic coupling filter unit, each resonator top or bottom on one side is provided with an opening, aperture position on two resonators is positioned at the top of resonator simultaneously or is positioned at the bottom of resonator simultaneously, the coupling edge of limit, opening place and two resonators is adjacent, and the position of two openings is with respect to the center line center symmetry of two coupling edge, and two coupling edge are made of the high impedance line.Filter of the present invention can be realized accurate elliptic function filter characteristic, compact conformation, and volume is little, and cost is low, and characteristic is good.
Description
Technical field
The present invention relates to microstrip filter, relate in particular to a kind of microstrip split-ring resonator filter with controllable electromagnetic coupling.
Background technology
Microwave filter plays crucial effect in wireless signal is handled, it can filtering interference signals, by useful signal.Since possess volume little, in light weight, be easy to process, be easy to integrated advantage, the microstrip filter with the response of accurate elliptic function is widely used in the circuit module of various wireless communication systems.High-temperature superconducting thin film has the sheet resistance of being almost equal to zero, and has high quality factor (Q value), and the accurate elliptic function microstrip filter that adopts high-temperature superconducting thin film to make has extremely low pass-band loss, is applicable to mobile communication base station system.Power system capacity can be improved after using high temperature superconduction wave filter in the mobile communication base station, reduces adjacent interference frequently, improves the mobile call quality, reduces the transmitting power of base station and mobile phone, reduces the electromagnetic radiation and the electromagnetic pollution in space.
Accurate elliptic function response is the filter response with finite frequency transmission zero, and transmission zero can appear at the one or both sides of filter passband, to improve the outer inhibition of band and to produce symmetry or asymmetrical filter response.The characteristic of utilizing transmission zero that the accurate elliptic function filter of low order is obtained is equal to even is better than the characteristic of high-order Chebyshev filter.But in the filter synthesis under the prior art condition design, the microstrip filter that only has a main coupling path can only be realized common chebyshev function filter response and the accurate elliptic function filter response that can't realize having transmission zero.Realize that the most frequently used method of transmission zero is to adopt the cross-couplings technology.The cross-couplings technology is meant that electromagnetic signal not only passed through main coupling path from the input of filter to output, has also passed through the cross-couplings path.Main coupling is meant in the filter input to the coupling successively in order of the resonant element between the output, and each resonant element only has coupled relation with adjacent with it in order resonant element; Cross-couplings is meant the coupled relation that has between the non-adjacent resonant element, and the filter with cross-couplings setting is called the cross-couplings filter.Most of accurate elliptic function filter characteristic is all realized by the cross-couplings filter at present, but traditional cross-couplings filter exists exponent number still higher, size is still bigger, and transmission zero location is very responsive to the coupling between each resonator, the shortcoming that design difficulty is high.And in existing microstrip filter, all only have single controlled electric coupling or magnetic coupling between all adjacent or non-adjacent resonant elements, and do not have the mixed coupling of controlled electromagnetism.Therefore, be necessary to propose a kind of main coupling filter of realizing the controllable electromagnetic hybrid coupled of accurate elliptic function filter characteristic.
Data shows a kind of microstrip split-ring half-wave resonator filter that typically has an accurate elliptic function filter response as shown in Figure 1, please refer to Jia-Sheng Hong and Michael J.Lancaster, " Couplings of microstrip square open-loop resonators for cross-coupledplanar microwave filters; " IEEE Transactions on Microwave Theory andTechniques, vol.44, no.12, pp.2099-2109, (December 1996).This design comprises four the square aperture ring resonator 11, input microstrip line 13, the output microstrip lines 14 that are provided with opening 12.In this design, the effective length of each resonator is a half-wavelength, and input resonator is to the cross-couplings that is coupled as between the output resonator, and its coupling polarity is electric coupling.Other coupling is main coupling, and its polarity is magnetic coupling.Electromagnetic signal produces through different coupling paths and differs, and makes the response of filter present the accurate elliptic function characteristic with transmission zero.Two transmission zero symmetries of this design, cross-linked size between input resonator and the output resonator determines the position of two transmission zeros simultaneously, change the position that cross-couplings can change two transmission zeros simultaneously, therefore two transmission zeros can not be by independent control, in addition, the position at zero point is very responsive for the variation of cross-couplings size, is difficult to design and uses.
Summary of the invention
The objective of the invention is to overcome the problem that existing main coupling filter can't be realized accurate elliptic function filter characteristic, overcome the problem that existing cross-couplings filter volume is still big and transmission zero can not independently be controlled, a kind of controllable electromagnetic coupling microstrip split-ring filter is provided, it realizes accurate elliptic function filter characteristic with main coupling filter, and compact conformation, volume is little, and cost is low, characteristic is good, is applicable to the needs of various radio communications.
Be the technical scheme that realizes that purpose of the present invention adopts: a kind of controllable electromagnetic coupling microstrip split-ring resonator filter, comprise input microstrip line, output microstrip line and micro-strip resonantor group, it is characterized in that described micro-strip resonantor group is meant one or more controllable electromagnetic coupling filter units; Described controllable electromagnetic coupling filter unit is made up of two resonators that intercouple, and the effective length of described each resonator is half operation wavelength of described controllable electromagnetic coupling microstrip split-ring resonator filter; In same controllable electromagnetic coupling filter unit, each resonator top or bottom on one side is provided with an opening, aperture position on two resonators is positioned at the top of resonator simultaneously or is positioned at the bottom of resonator simultaneously, the limit at described opening place is adjacent with the coupling edge of two resonators, and the position of two openings is with respect to the center line center symmetry of two coupling edge, and described two coupling edge are made of the high impedance line.
As a kind of simple structure, described micro-strip resonantor group is meant a controllable electromagnetic coupling filter unit; Described controllable electromagnetic coupling filter unit is made up of two resonators that intercouple, the effective length of described each resonator is half operation wavelength of described controllable electromagnetic coupling microstrip split-ring resonator filter, each resonator top or bottom on one side is provided with an opening, aperture position on two resonators is positioned at the top of resonator simultaneously or is positioned at the bottom of resonator simultaneously, the limit at described opening place is adjacent with the coupling edge of two resonators, and the position of two openings is with respect to the center line center symmetry of two coupling edge, and described two coupling edge are made of the high impedance line.
More particularly, the resonator in the described micro-strip resonantor group is rectangle resonator or triangle resonator.
Resonator in the above-mentioned micro-strip resonantor group is arranged in a linear, and such structure is more suitable for using in duplex, multiplexer than cross-couplings filter.
Groundwork principle of the present invention is: filter of the present invention is by top or bottom opening on each resonator one side, form very strong Electric Field Distribution near can making opening, and two coupling edge of adjacent two resonators are made of the high impedance line, can form stronger Distribution of Magnetic Field near the zone the high impedance line, such structure facilitates adjacent two resonators and realizes stronger electromagnetic coupled.Adjust two openings on two resonators that intercouple in the position on limit, place, promptly adjust two relative distances between the opening and just can change electric coupling and magnetic-coupled ratio: the distance of two aperture positions is near more, then electric coupling is big more with respect to magnetic coupling, otherwise then magnetic coupling is big more with respect to electric coupling.Therefore, two adjacent resonators have just constituted an independent controllable electromagnetic coupling filter unit by the electromagnetism hybrid coupled.Electromagnetic signal all can produce a transmission zero by any one electromagnetic coupled filter unit, thereby the relative distance of two aperture positions of control is controlled two electromagnetic coupled ratios between the resonator that intercouples, and just can control transmission zero location that described electromagnetic coupled filter unit produced to realize needed accurate elliptic function filter characteristic.When two opening relative distances were big, when then magnetic coupling was greater than electric coupling, described controllable electromagnetic coupling filter unit can be realized the transmission zero in a passband left side; When two opening relative distances hour, when then magnetic coupling was less than electric coupling, described controllable electromagnetic coupling filter unit can be realized the transmission zero on a passband right side.
Each controllable electromagnetic coupling filter unit can work alone and constitute the accurate elliptic function filter of second order with single transmission zero, also can with other hybrid coupled unit or resonant element intercouples and collaborative work has a plurality of transmission zeros with formation High-order quasi elliptic function filter.
Compared with prior art, the present invention has following advantage:
1, traditional main coupling microstrip filter can only be realized common Chebyshev's filter response, and the present invention can realize the better accurate elliptic function filter of performance by the control to electromagnetism hybrid coupled in the main coupling between the adjacent micro-strip resonantor, reduced the number of required resonant element, thereby reduced the size of filter, reduced production cost.
2, compare with existing cross-couplings filter, the present invention has lower exponent number, littler volume and transmission zero setting more flexibly.Traditional cross-couplings filter needs at least three resonant elements could produce a transmission zero; And the present invention only needs an electromagnetic coupled filter unit that comprises two resonant elements just can produce a transmission zero.The transmission zero of cross-couplings filter needs global design, and wherein the variation of each transmission zero location all can cause the variation of other transmission zeros, and the position of transmission zero is very responsive to the variation of cross-couplings size; And in the present invention, each transmission zero all is independently to be created by single controllable electromagnetic hybrid coupled unit, therefore in the hybrid coupled filter of high-order, single transmission zero changes the variation that can not cause other transmission zero, is easy to realize asymmetrical filter response.
3, in the present invention, because resonator is along linear array, so the present invention is more suitable for using in duplex, multiplexer than cross-couplings filter.
4, the present invention can combine with existing cross-couplings technology, and it is littler to create volume, the accurate elliptic function filter that performance is more superior.
5, the present invention not only can be used for traditional plane common metal microstrip filter, is more suitable for having in manufacturing the high temperature superconduction wave filter of high quality factor.
Description of drawings
Fig. 1 is a kind of microstrip split-ring half-wave resonator Filter Structures schematic diagram that typically has accurate elliptic function filter response in the prior art;
Fig. 2 a is the structural representation of the second order controllable electromagnetic coupling rectangular microstrip split-ring resonator filter of employing among the embodiment 1;
Fig. 2 b is the structural representation of the second order controllable electromagnetic coupling triangle microstrip split-ring resonator filter of embodiment 1 employing;
Fig. 3 is the structural representation of the quadravalence controllable electromagnetic coupling rectangular microstrip split-ring resonator filter of employing among the embodiment 2;
Fig. 4 is second order controllable electromagnetic coupling triangle microstrip split-ring resonator filter and the three rank controllable electromagnetic coupling triangle microstrip split-ring resonator filters that the stepped impedance micro-band resonance unit constitutes that adopt among the embodiment 3;
Fig. 5 is the Electromagnetic Simulation curve synoptic diagram of the frequency response of the coupling of second order controllable electromagnetic shown in Fig. 2 b triangle microstrip split-ring resonator filter, and it has a controllable transmission zero points;
Fig. 6 is the Electromagnetic Simulation curve and the experiment test curve synoptic diagram of the frequency response of quadravalence controllable electromagnetic coupling rectangular microstrip split-ring resonator filter shown in Figure 3, and it has a low stopband transmission zero and a high stopband transmission zero simultaneously;
Fig. 7 is the Electromagnetic Simulation curve and the experiment test curve synoptic diagram of the frequency response of three rank controllable electromagnetic coupling triangle microstrip split-ring resonator filters shown in Figure 4, and it has a controlled high stopband transmission zero.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing.
The structure of second order controllable electromagnetic coupling microstrip split-ring resonator filter of the present invention is shown in Fig. 2 a～Fig. 2 b, wherein Fig. 2 a is the structural representation of second order controllable electromagnetic coupling rectangular microstrip split-ring resonator filter, Fig. 2 b is the structural representation of second order controllable electromagnetic coupling triangle microstrip split-ring resonator filter, comprise two resonators 21,26, signal input microstrip line 24 and signal output microstrip line 25.The effective length of resonator 21,26 is half operation wavelength of described second order controllable electromagnetic coupling microstrip split-ring resonator filter, the top on one side adjacent with coupling edge 23 is provided with an opening 22 in the resonator 21, the top on one side adjacent with coupling edge 28 is provided with an opening 27 in the resonator 26, and opening 22 and 27 position can be adjusted on its limit, place according to the needed electricity of filter, magnetic-coupled ratio; Described opening 22 and 27 position are with respect to the center line center symmetry (or near symmetrical gets final product) of two coupling edge 23,28, and coupling edge 23 and 28 is made of the high impedance line, is convenient to realize stronger electromagnetic coupled.The shape of resonator 21,26 can be a rectangle, as Fig. 2 a, also can be triangle, as Fig. 2 b.Two resonators 21 that intercouple by controllable electromagnetic coupling and 26 constitute an independent controllable electromagnetic coupling filter unit, are called for short the electromagnetic coupled filter unit.Electromagnetic signal all can produce a transmission zero by any one electromagnetic coupled filter unit, can control the position of this transmission zero by the scale of control electromagnetic coupled.In operating frequency, owing to have very strong Electric Field Distribution E near the opening 22 and 27 at resonator 21,26 tops, therefore the zone between the open top 22 and 27 of adjacent two resonators 21,26 has formed the highfield coupling; Because the coupling edge 23,28 of two resonators 21,26 is made of the high impedance line, therefore near the zone the high impedance line has stronger Distribution of Magnetic Field H, and therefore the zone of coupling edge 23,28 1 sides of adjacent two resonators 21,26 has formed the high-intensity magnetic field coupling.Adjust the position of two openings 22 and 27 on its limit, promptly adjust two relative distances between opening and just can change electric coupling and magnetic-coupled ratio.Two extended distances are near more, and then electric coupling is big more with respect to magnetic coupling, otherwise then magnetic coupling is big more with respect to electric coupling.Control the electromagnetic coupled ratio between two resonators 21,26, just can control transmission zero location that described electromagnetic coupled filter unit produced to realize needed accurate elliptic function filter characteristic.When two opening relative distances were big, when then magnetic coupling was greater than electric coupling, described controllable electromagnetic coupling filter unit can be realized the transmission zero in a passband left side; When two opening relative distances hour, when then magnetic coupling was less than electric coupling, described controllable electromagnetic coupling filter unit can be realized the transmission zero on a passband right side.
Adopt the second order controllable electromagnetic coupling triangle microstrip split-ring resonator filter shown in Fig. 2 b, when two openings 22 and 27 s' relative distance during approximately greater than the width of single resonator, then magnetic coupling is greater than electric coupling, shown in the curve among Fig. 5 51, controllable electromagnetic coupling filter unit can be realized the transmission zero 52 in a passband left side by the simulated response curve of its controllable electromagnetic that constitutes coupling filter unit; When two openings 22 and 27 s' relative distance during approximately less than the width of single resonator, then magnetic coupling is less than electric coupling, shown in the curve among Fig. 5 53, controllable electromagnetic coupling filter unit can be realized the transmission zero 54 on a passband right side by the simulated response curve of its controllable electromagnetic that constitutes coupling filter unit; As seen, this filter can be realized the transmission zero of a position-controllable.
Embodiment 2
The quadravalence controllable electromagnetic that comprises two controllable electromagnetic coupling filter units is coupled the rectangular microstrip split-ring resonator filter as shown in Figure 3, comprise four resonators 31～34, signal input microstrip line 24 and signal output microstrip line 25, resonator 31 and 32 is formed a controllable electromagnetic coupling filter unit, resonator 33 and 34 is formed another controllable electromagnetic coupling filter unit, and four resonators 31～34 are along linear array.The effective length of resonator 31～34 is half operation wavelength of described filter, the top on one side that resonator 31 and coupling edge 35 are adjacent is provided with an opening 39, the top on one side that resonator 32 and coupling edge 36 are adjacent is provided with an opening 40, opening 39 and 40 position can be adjusted on the limit at its place according to the needed electricity of filter, magnetic coupling ratio, and opening 39,40 is with respect to the center line center symmetry (or near symmetrical gets final product) of two coupling edge 35,36; Same, bottom on the adjacent one side of resonator 33 and coupling edge 37 is provided with an opening 41, the bottom on one side that resonator 34 and coupling edge 38 are adjacent is provided with an opening 42, opening 41 and 42 position can be adjusted on the limit at its place according to the needed electricity of filter, magnetic coupling ratio, and opening 41,42 is with respect to the center line center symmetry (or near symmetrical gets final product) of two coupling edge 37,38; Coupling edge 35～38 is made of the high impedance line, is convenient to realize stronger electromagnetic coupled.
The shape of resonator 31～34 is rectangles, and the emulation of this filter and actual measurement response curve are as shown in Figure 6.Among Fig. 6, S11 represents filter input end to the reflection coefficient between the output, and S21 represents the transmission coefficient of filter input end to output.When the distance of 39,40 of the openings on the resonator 31,32 during approximately greater than the width of single resonator, then magnetic coupling is greater than electric coupling, and the controllable electromagnetic of its composition coupling filter unit has been realized the controllable transmission zero points 61 in passband left side; When the distance of 41,42 of the openings on the resonator 33,34 during approximately less than the width of single resonator, then magnetic coupling is less than electric coupling, and the controllable electromagnetic of its composition coupling filter unit has been realized the controllable transmission zero points 62 on passband right side.Therefore, this filter has right two controllable transmission zero points of a first from left.
Embodiment 3:
The three rank controllable electromagnetics that comprise a controllable electromagnetic coupling filter unit are coupled the triangle microstrip split-ring resonator filters as shown in Figure 4, comprise a stepped impedance resonant element 43, two triangle open mouth ring resonators 44,45, signal input microstrip line 24 and 25, two resonators of signal output microstrip line 44,45 are formed a controllable electromagnetic coupling filter unit.The effective length of resonator 44,45 is half operation wavelength of filter, the top on one side that resonator 44 and coupling edge 46 are adjacent is provided with an opening 48, and the position of opening 48 can be adjusted on its limit, place according to the needed electricity of filter, magnetic coupling ratio; The top on one side that resonator 45 and coupling edge 47 are adjacent is provided with an opening 49, and the position of opening 49 can be adjusted on its limit, place according to the needed electricity of filter, magnetic coupling ratio; The position of opening 48,49 is with respect to the center line center symmetry (or near symmetrical gets final product) of coupling edge 46 and 47, and coupling edge 46 and 47 is made of the high impedance line, is convenient to realize stronger electromagnetic coupled.The shape of resonator 44,45 is triangles, the emulation of this filter and the actual measurement response curve as shown in Figure 7, among Fig. 7, S11 represents filter input end to the reflection coefficient between the output, S21 represents the transmission coefficient of filter input end to output.When the opening 48 of two resonators 44,45 and 49 distances approximately less than the width of single resonator, then magnetic coupling is less than electric coupling, the controllable electromagnetic of its composition coupling filter unit has been realized the controllable transmission zero points 71 on passband right side.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; for example; each controllable electromagnetic coupling filter unit can also intercouple and collaborative work with a plurality of controllable electromagnetic hybrid coupled filter units; constitute high-order elliptic function filter filter with a plurality of transmission zeros; perhaps intercouple and collaborative work with other resonant element; constitute and have high-order elliptic function filter that is no less than a transmission zero or the like; anyly do not deviate from the change of being done under spirit of the present invention and the principle; modify; substitute; combination; simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1, a kind of controllable electromagnetic coupling microstrip split-ring resonator filter comprises input microstrip line, output microstrip line and micro-strip resonantor group, it is characterized in that, described micro-strip resonantor group is meant one or more controllable electromagnetic coupling filter units; Described controllable electromagnetic coupling filter unit is made up of two resonators that intercouple, and the effective length of described each resonator is half operation wavelength of described controllable electromagnetic coupling microstrip split-ring resonator filter; In same controllable electromagnetic coupling filter unit, each resonator top or bottom on one side is provided with an opening, aperture position on two resonators is positioned at the top of resonator simultaneously or is positioned at the bottom of resonator simultaneously, the limit at described opening place is adjacent with the coupling edge of two resonators, and the position of two openings is with respect to the center line center symmetry of two coupling edge, and described two coupling edge are made of the high impedance line.
2, controllable electromagnetic coupling microstrip split-ring resonator filter according to claim 1 is characterized in that, described micro-strip resonantor group is meant a controllable electromagnetic coupling filter unit; Described controllable electromagnetic coupling filter unit is made up of two resonators that intercouple, the effective length of described each resonator is half operation wavelength of described controllable electromagnetic coupling microstrip split-ring resonator filter, each resonator top or bottom on one side is provided with an opening, aperture position on two resonators is positioned at the top of resonator simultaneously or is positioned at the bottom of resonator simultaneously, the limit at described opening place is adjacent with the coupling edge of two resonators, and the position of two openings is with respect to the center line center symmetry of two coupling edge, and described two coupling edge are made of the high impedance line.
According to claim 1 or 2 described controllable electromagnetic coupling microstrip split-ring resonator filters, it is characterized in that 3, the resonator in the described micro-strip resonantor group is rectangle resonator or triangle resonator.
According to claim 1 or 2 described controllable electromagnetic coupling microstrip split-ring resonator filters, it is characterized in that 4, the resonator in the described micro-strip resonantor group is along linear array.
According to the described controllable electromagnetic coupling microstrip split-ring resonator filter of claim 3, it is characterized in that 5, the resonator in the described micro-strip resonantor group is along linear array.
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| CN101916893A (en) * | 2010-08-11 | 2010-12-15 | 东南大学 | Double frequency band-pass filter based on double branch line loading stepped -impedance resonator |
| CN104332682A (en) * | 2014-11-14 | 2015-02-04 | 南京波而特电子科技有限公司 | Band-pass filter based on split ring microstrip line |
| CN104966872A (en) * | 2015-07-20 | 2015-10-07 | 成都顺为超导科技股份有限公司 | High-temperature superconducting filter device with controllable transmission zero |
| CN106711556A (en) * | 2017-02-14 | 2017-05-24 | 华南理工大学 | Miniaturized microstrip quadruplexing device |
| CN108717994A (en) * | 2018-04-18 | 2018-10-30 | 西安电子科技大学 | A kind of novel planar double frequency band-pass filter antenna applied to WLAN frequency ranges |
| CN110556614A (en) * | 2019-08-22 | 2019-12-10 | 中国电子科技集团公司第二十九研究所 | Microstrip filter composed of C-shaped resonance pairs |
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| CN101916893B (en) * | 2010-08-11 | 2013-01-09 | 东南大学 | Double frequency band-pass filter based on double branch line loading stepped -impedance resonator |
| CN101916893A (en) * | 2010-08-11 | 2010-12-15 | 东南大学 | Double frequency band-pass filter based on double branch line loading stepped -impedance resonator |
| CN104332682A (en) * | 2014-11-14 | 2015-02-04 | 南京波而特电子科技有限公司 | Band-pass filter based on split ring microstrip line |
| CN104966872A (en) * | 2015-07-20 | 2015-10-07 | 成都顺为超导科技股份有限公司 | High-temperature superconducting filter device with controllable transmission zero |
| CN106711556A (en) * | 2017-02-14 | 2017-05-24 | 华南理工大学 | Miniaturized microstrip quadruplexing device |
| CN106711556B (en) * | 2017-02-14 | 2020-09-22 | 华南理工大学 | Miniaturized microstrip quadruplex ware |
| CN108717994A (en) * | 2018-04-18 | 2018-10-30 | 西安电子科技大学 | A kind of novel planar double frequency band-pass filter antenna applied to WLAN frequency ranges |
| CN110556614B (en) * | 2019-08-22 | 2022-06-07 | 中国电子科技集团公司第二十九研究所 | Microstrip filter composed of C-shaped resonance pairs |
| CN110556614A (en) * | 2019-08-22 | 2019-12-10 | 中国电子科技集团公司第二十九研究所 | Microstrip filter composed of C-shaped resonance pairs |
| WO2021093016A1 (en) * | 2019-11-12 | 2021-05-20 | 郴州世通科技有限公司 | Microstrip line filter |
| CN111883888A (en) * | 2020-08-07 | 2020-11-03 | 安徽华东光电技术研究所有限公司 | W-band reconfigurable microstrip filter based on intercalated graphene and manufacturing method thereof |
| CN111883888B (en) * | 2020-08-07 | 2021-07-06 | 安徽华东光电技术研究所有限公司 | W-band reconfigurable microstrip filter based on intercalated graphene and manufacturing method thereof |
| CN113178669A (en) * | 2021-05-13 | 2021-07-27 | 云南大学 | 5G millimeter wave band-pass filter based on integrated substrate gap waveguide |
| CN113178669B (en) * | 2021-05-13 | 2022-05-24 | 云南大学 | 5G millimeter wave band-pass filter based on integrated substrate gap waveguide |
| CN117638437A (en) * | 2024-01-25 | 2024-03-01 | 中天通信技术有限公司 | Waveguide bandpass filter and electrical apparatus |
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| CN207896249U (en) | Comb filter |
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Application publication date: 20091209 |