CN110112521B - Small four-die cavity dual-band broadband filter - Google Patents
Small four-die cavity dual-band broadband filter Download PDFInfo
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- CN110112521B CN110112521B CN201910433262.XA CN201910433262A CN110112521B CN 110112521 B CN110112521 B CN 110112521B CN 201910433262 A CN201910433262 A CN 201910433262A CN 110112521 B CN110112521 B CN 110112521B
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- 239000007787 solid Substances 0.000 claims abstract description 56
- 239000004020 conductor Substances 0.000 claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 210000001787 dendrite Anatomy 0.000 claims 3
- 238000004891 communication Methods 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 8
- 238000010295 mobile communication Methods 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000005684 electric field Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002044 microwave spectrum Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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Abstract
The invention discloses a small four-die cavity dual-bandwidth filter, which comprises: the filter comprises a cylindrical metal cavity, an SMA radio frequency connection input port, an SMA radio frequency connection output port, an inverted L-shaped input feeder, an inverted L-shaped output feeder, a first solid inner conductor and a second solid inner conductor, wherein the whole filter structure is a symmetrical structure about a symmetrical plane A-A'. The invention realizes the double-frequency broadband characteristics of small size and high power capacity, and has the characteristics of high passband selectivity caused by the transmission zero point on both sides of the passband, low dispersion, simple design and processing and the like, can meet the design requirement of a small double-frequency broadband communication system, and can be applied to microwave electronic systems such as mobile communication, radars, satellites and the like.
Description
Technical Field
The invention relates to a cavity filter, in particular to a small four-cavity dual-bandwidth filter.
Background
With the rapid development of wireless communication, spectrum resources are increasingly strained. In order to reduce communication cost and improve spectrum utilization rate, the dual-frequency filter is used as the most commonly used multi-frequency filter, and becomes a research hot spot because the dual-frequency filter can be compatible with key devices at the front end of a dual-frequency communication system with different systems. The cavity dual-frequency filter has the advantages of low insertion loss, high Q value (quality factor), high power capacity, high stability and the like, so that the cavity dual-frequency filter is widely applied to high-selectivity narrow-band communication, and particularly the radio frequency filter mainly comprising the cavity filter is still one of key equipment in a mobile communication base station, a satellite communication system and a military communication system.
However, as wireless communication progresses toward miniaturization and broadband, wireless multi-frequency communication systems place higher demands on cavity filters. Firstly, the size of the cavity filter influences the size, integration and packaging and production cost of the whole system, and miniaturization is a development trend; meanwhile, the trend of high-rate data transmission makes the bandwidth of the working spectrum wider and wider, and in order to relieve the shortage of microwave spectrum resources, wireless communication is forward developing into millimeter wave and terahertz frequency bands. The small cavity broadband multi-frequency filter is a critical device which is urgently needed in broadband multi-frequency communication systems such as satellites, radars, mobile communication and the like.
The current broadband dual-frequency filter can only be realized through a planar microstrip structure, and in 2013, a Wen Wu research team proposes a small planar broadband dual-frequency filter (IEEE Transaction on MTT) by adopting an open-circuit branch to load a short-circuit step impedance resonator. The frequency response is shown in fig. 1, and the FBW of the two pass bands is 48.5% and 54.2%, respectively. The broadband dual-frequency filter designed by the method not only has good passband characteristics and frequency selectivity, but also has smaller size.
Because of the high Q characteristic of the cavity, the study of the cavity dual-band wideband filter is still blank, and for the design of the cavity dual-band wideband filter, the difficulty is how to increase the bandwidth of each passband of the cavity dual-band filter, or from another angle, how to increase one broadband passband of the cavity single-band wideband filter.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provides a small four-cavity dual-bandwidth filter which has the advantages of compact structure, small volume, low cost, high Q value, high power capacity and capability of realizing cavity dual-bandwidth.
The technical scheme adopted by the invention for solving the technical problems is that a small four-die cavity dual-bandwidth filter is constructed, comprising: the cylindrical metal cavity is provided with an SMA radio frequency connection input port, an SMA radio frequency connection output port, an inverted L-shaped input feeder line, an inverted L-shaped output feeder line, a first solid inner conductor and a second solid inner conductor; the small four-cavity dual-bandwidth filter is symmetrical about a symmetrical plane A-A';
the inverted L-shaped input feeder line is connected with the signal line of the SMA radio frequency connection input port; the inverted L-shaped output feeder line is connected with the signal line of the SMA radio frequency connection output port, and the SMA radio frequency connection input port and the output port are orthogonally fixed on the outer wall of the cylindrical metal cavity; the first solid inner conductor and the second solid inner conductor are cylinders with equal height, equal diameter and much larger height than the diameter and are vertically connected with the lower round bottom surface of the cylindrical metal cavity, and the heights of the first solid inner conductor and the second solid inner conductor determine TM 01 Mode and TM 11 Resonant frequency of mode, TM 01 Mode and TM 11 The mode is used for realizing a low-frequency passband; the diameter of the cylindrical metal cavity affects the resonant frequencies of the TE+ mode and the TE-mode, the TE+ mode and the TE-mode are used for realizing a high-frequency passband, and the height of the cylindrical metal cavity is higher than the heights of the first solid inner conductor and the second solid inner conductor.
In the small four-cavity dual-bandwidth filter, inverted branches of the inverted L-shaped input feeder line and the inverted L-shaped output feeder line are arranged between a first solid inner conductor and a second solid inner conductor, the lengths of the inverted branches influence the separation of a TE+ mode and a TE-mode, so that the K value of a high-frequency passband is controlled, and gaps between the inverted branches and the first solid inner conductor and between the inverted branches and the second solid inner conductor influence the Q values of the TE+ mode and the TE-mode; the height-influencing TM of the inverted L-shaped input feed line and the inverted L-shaped output feed line 01 Mode and TM 11 The Q value of the modulus; the inverted L-shaped input feed line and the inverted L-shaped output feed lineThere is a source load coupling between the lines, the amount of coupling being determined by the gap between the inverted branches, the coupling creating and controlling the transmission zero.
In the small four-cavity dual-band wideband filter of the present invention, the gap between the first solid inner conductor and the second solid inner conductor is controlled by TM 01 Mode and TM 11 The separation of the modes thereby controls the K value of the low frequency passband.
In the small four-cavity dual-bandwidth filter, the inverted L-shaped input feeder line is connected with a signal line of the SMA radio frequency connection input port through welding; the inverted L-shaped output feeder line is connected with the signal line of the SMA radio frequency connection output port through welding.
In the small four-cavity dual-bandwidth filter, the SMA radio frequency connection input port and the SMA radio frequency connection output port are orthogonally fixed on the outer wall of the cylindrical metal cavity through four peripheral screws.
In the small four-cavity dual-bandwidth filter, the first solid inner conductor and the second solid inner conductor are vertically connected with the lower round bottom surface of the cylindrical metal cavity through welding.
In the small four-cavity dual-band broadband filter, the dual-band broadband characteristics of small size and high power capacity are realized, the transmission zero points are arranged on two sides of the passband to bring higher passband selectivity, and in addition, the filter has the characteristics of low dispersion, simple design and processing and the like, can meet the design requirements of a small dual-band broadband communication system, and can be applied to microwave electronic systems such as mobile communication, radars, satellites and the like.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a frequency response diagram of a small planar broadband dual-frequency filter implemented by a method of loading a short-circuit step impedance resonator with an open stub in the prior art;
fig. 2 is a 3D view of a small four-cavity dual-bandwidth filter structure according to the present invention;
FIG. 3 is a top view of a dual-band wideband filter structure with a small four-cavity structure according to the present invention;
FIG. 4 is a side view of a dual-band wideband filter structure with a small four-cavity structure according to the present invention;
FIG. 5a is a TM 01 A mode magnetic field map;
FIG. 5b is a TM 11 A mode magnetic field map;
FIG. 5c is a TE-mode electric field diagram;
FIG. 5d is a TE+ mode electric field diagram;
FIG. 6 is a graph showing the variation of the insertion loss of the filter according to the present invention as the height h1 of the solid inner conductor varies;
FIG. 7 is a graph showing the variation of the transmission response of the filter according to the present invention as the feed height h2 varies;
FIG. 8 is a graph showing the transmission response of the filter according to the present invention as the distance L1 between the L-shaped feed line and the center of the circle varies;
fig. 9 is a diagram of transmission response simulation results of a filter according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention will be further described with reference to specific embodiments, it being understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
In order to realize the cavity dual-band broadband filter, the invention provides a four-cavity dual-band broadband filter realized by adopting an inverted L-shaped feeder line and double solid inner conductors in a cylindrical metal cavity by adopting a four-mode resonance technology, and the specific design principle is as follows:
1. four-mode implementation principle.
The structure diagram of the four-cavity dual-bandwidth filter provided by the invention is shown in figures 2-4. Figure 5 is a graph of the electromagnetic field distribution of the three resonant modes,wherein FIG. 5a is, FIG. 5b is, FIG. 5c is and FIG. 5d is a schematic diagram showing the TM in the metal cavity, respectively 01 Mode magnetic field pattern, TM 11 Mode magnetic field pattern, TE-mode electric field pattern and TE+ mode electric field pattern, A-A' represent symmetry planes, wherein TM 01 Mode and TM 11 The mode is two modes excited in the metal cavity by the height h1 of the two solid inner conductors and the interval between the two solid inner conductors, and the TE+ mode and the TE-mode are a pair of degenerate modes which determine the resonant frequency by the cavity radius. As shown in FIG. 6, as the height h1 of the solid inner conductor increases, the thickness of the solid inner conductor is increased by TM 01 Mode and TM 11 The first passband frequency of the mode component is shifted to low frequencies while the second passband is nearly unchanged. At the same time, the pair of degenerate modes is controlled by the length of the L-shaped feeder line, the pair of TE degenerate modes is separated and the external Q values of the four modes can be influenced by the feed height h2 by controlling the height of the L-shaped feeder line, the variation diagram of the feed height h2 is shown in fig. 7, and the external Q values of the four modes in the two pass bands are influenced. Finally, the distance L1 between the L-shaped feeder and the center of the circle has a larger influence on the Q value of the TE degenerate mode and a smaller influence on the Q values of the two TM modes, and the variation diagram is shown in fig. 8, wherein the first passband is basically unchanged in band and the second passband is greatly changed in band according to the variation of L1.
2. Dual-frequency broadband implementation principle
TM 01 Mode and TM 11 The mode is used to achieve a low frequency passband, the center frequency of which is determined by the length of the solid inner conductors, and the coupling coefficient K value is determined by the spacing of the two solid inner conductors. The TE+ mode and the TE-mode are used for realizing a high-frequency passband, the center frequency of the high-frequency passband is determined by the radius of the cavity, the K value is determined by the length of the L-shaped feeder line, and the bandwidths of the two passband are realized by increasing the K value of the passband. The transmission zero between the low frequency pass band and the high frequency pass band is created by source load coupling.
The invention aims to overcome the defects of the prior art, and provides a four-mode resonance technology, which has the advantages of compact structure, small volume, low cost, high Q value and high power capacity, and adopts an inverted L-shaped feeder line and double solid inner conductors to load a cavity to realize a four-mode cavity double-frequency broadband filter. The filter can meet the design requirements of small size, high power capacity, double frequency broadband and high selectivity, and can be applied to microwave electronic systems such as base stations, radars, remote sensing and the like in mobile communication. In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the cylindrical metal cavity adopts an inverted L-shaped feeder line and a double solid inner conductor to load so as to realize the four-cavity double-frequency broadband filter.
For clarity of description of the present invention, fig. 2-4 are three-dimensional, top and side views, respectively, of the present invention, a compact four-cavity dual-band wideband filter comprising: the cylindrical metal cavity 1, the SMA radio frequency connection input port 2, the SMA radio frequency connection output port 3, the inverted L-shaped input feeder line 4, the inverted L-shaped output feeder line 5, the first solid inner conductor 6 and the second solid inner conductor 7.
The cavity 1 is a hollow cylindrical cavity, the height of the cavity is larger than that of the solid inner conductors 6 and 7, the diameter of the cavity determines the resonant frequency of a pair of TE degenerate modes (TE+ mode and TE-mode), the SMA radio frequency connection input port 2 and the output port 3 are orthogonally fixed on the outer wall of the cavity with a certain height through 4 peripheral screws, and the height is controlled TM 01 Mode and TM 11 The Q value of the modulus; the first solid inner conductor 6 and the second solid inner conductor 7 are solid cylinders, the bottoms of the solid inner conductors are fixed at the center of the round bottom surface of the cavity by welding, and the height of the solid inner conductors determines TM 01 Mode and TM 11 Is a resonant frequency of (a).
Further, the front ends of the inverted L-shaped input feeder 4 and the inverted L-shaped output feeder 5 are inverted branches, the inverted branches are placed between the first solid inner conductor 6 and the second solid inner conductor 7, the lengths of the inverted branches influence the separation of the te+ mode and the TE-mode, so that the K value of a high-frequency passband is controlled, and the gaps between the inverted branches and the solid inner conductors influence the Q values of the te+ mode and the TE-mode. There is a source load coupling between the inverted L-shaped input feed line 4 and the inverted L-shaped output feed line 5, the amount of coupling being determined by the gap between its inverted branches, which coupling creates and controls the transmission zero.
Further, a gap control TM between the first 6 and second 7 solid inner conductors 01 Mode and TM 11 The separation of the modes thereby controls the K value of the low frequency passband.
The cylindrical cavity of the filter realized according to the above embodiment has a height of 24mm, a diameter of 28mm and a height of 18.2mm for both solid inner conductors. The filter is made of metal, in this embodiment metallic aluminum, and silver plated on the surface to reduce losses. The simulation result of the small four-cavity dual-band wideband filter is shown in fig. 9. The filter has a low pass band center frequency of 2.4GHz, a pass band bandwidth of 500MHz (FBW of 20.8%), a high pass band center frequency of 4GHz, and a pass band bandwidth of 1500MHz (FBW of 37.5%). The positions of the 3 transmission zeros are 1.9GHz,3GHz and 7.8GHz respectively.
The four-cavity dual-bandwidth filter provided by the embodiment of the invention has two wider broadband passband characteristics, higher passband selectivity and smaller size, can meet the design requirements of a small dual-bandwidth communication system, can be applied to microwave electronic systems such as mobile communication, radar, remote sensing and the like, and is worthy of popularization. The invention includes, but is not limited to, the embodiments given above, and it is within the contemplation of the invention for a person skilled in the art to make various modifications and substitutions, such as changing the coupling position of the feed line, changing the cylindrical cavity to other shapes, machining or plating with other metals, without departing from the principles of the invention, which modifications and substitutions are also within the scope of the invention.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. A small four-cavity dual-bandwidth filter, comprising: the cylindrical metal cavity is provided with an SMA radio frequency connection input port, an SMA radio frequency connection output port, an inverted L-shaped input feeder line, an inverted L-shaped output feeder line, a first solid inner conductor and a second solid inner conductor; the small four-cavity dual-bandwidth filter is symmetrical about a symmetrical plane A-A';
the inverted L-shaped input feeder line is connected with the signal line of the SMA radio frequency connection input port; the inverted L-shaped output feeder line is connected with the signal line of the SMA radio frequency connection output port, and the SMA radio frequency connection input port and the output port are orthogonally fixed on the outer wall of the cylindrical metal cavity; the first solid inner conductor and the second solid inner conductor are cylinders with equal height, equal diameter and much larger height than the diameter and are vertically connected with the lower round bottom surface of the cylindrical metal cavity, and the heights of the first solid inner conductor and the second solid inner conductor determine TM 01 Mode and TM 11 Resonant frequency of mode, TM 01 Mode and TM 11 The mode is used for realizing a low-frequency passband; the diameter of the cylindrical metal cavity influences the resonant frequencies of a TE+ mode and a TE-mode, the TE+ mode and the TE-mode are used for realizing a high-frequency passband, and the height of the cylindrical metal cavity is higher than that of the first solid inner conductor and the second solid inner conductor; the inverted dendrites of the inverted L-shaped input feeder and the inverted L-shaped output feeder are arranged between a first solid inner conductor and a second solid inner conductor, the length of the inverted dendrites influences the separation of a TE+ mode and a TE-mode, so that the K value of a high-frequency passband is controlled, and the gaps between the inverted dendrites and the first solid inner conductor and the second solid inner conductor mainly influence the Q values of the TE+ mode and the TE-mode; the height-influencing TM of the inverted L-shaped input feed line and the inverted L-shaped output feed line 01 Mode and TM 11 The Q value of the modulus; source load coupling exists between the inverted L-shaped input feeder line and the inverted L-shaped output feeder line, the coupling quantity is determined by the gap between the inverted branches, and the coupling generates and controls a transmission zero point; and the K value is the coupling coefficient of the small four-cavity dual-frequency broadband filter.
2. The miniature four-cavity dual-band wideband filter of claim 1, wherein a gap between said first and second solid inner conductors is controlled by TM 01 Mode and TM 11 The separation of the modes thereby controls the K value of the low frequency passband.
3. The small four-cavity dual-bandwidth filter according to claim 2, wherein the inverted L-shaped input feed line is connected to the signal line of the SMA radio frequency connection input port by welding; the inverted L-shaped output feeder line is connected with the signal line of the SMA radio frequency connection output port through welding.
4. The small four-cavity dual-bandwidth filter of claim 2, wherein the SMA rf connection input port and output port are orthogonally affixed to the outer wall of the cylindrical metal cavity by four screws on the periphery.
5. A compact four-cavity dual-bandwidth filter as recited in claim 3, characterised in that said first solid inner conductor and said second solid inner conductor are vertically connected to a lower circular bottom surface of said cylindrical metal cavity by welding.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792771A (en) * | 1986-02-21 | 1988-12-20 | Com Dev Ltd. | Quadruple mode filter |
| KR20050064724A (en) * | 2003-12-24 | 2005-06-29 | 한국전자통신연구원 | Microstrip cross coupled bandpass filters with asymmetric frequency characteristics |
| KR20120129248A (en) * | 2011-05-19 | 2012-11-28 | 주식회사 에이스테크놀로지 | Multi mode filter for realizing wideband using capacitive coupling and inductive coupling |
| CN103296358A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Resonance cavity and tuning method of resonance cavity |
| CN104091985A (en) * | 2014-06-19 | 2014-10-08 | 华南理工大学 | Broadband filter with single-cavity four-mode cavity resonator |
| CN104934669A (en) * | 2015-06-15 | 2015-09-23 | 华南理工大学 | Double-frequency helical cavity filter with controllable bandwidth |
| CN109742493A (en) * | 2019-01-21 | 2019-05-10 | 淮阴工学院 | A kind of difference double-passband filter based on four mould dielectric resonators |
-
2019
- 2019-05-23 CN CN201910433262.XA patent/CN110112521B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792771A (en) * | 1986-02-21 | 1988-12-20 | Com Dev Ltd. | Quadruple mode filter |
| KR20050064724A (en) * | 2003-12-24 | 2005-06-29 | 한국전자통신연구원 | Microstrip cross coupled bandpass filters with asymmetric frequency characteristics |
| KR20120129248A (en) * | 2011-05-19 | 2012-11-28 | 주식회사 에이스테크놀로지 | Multi mode filter for realizing wideband using capacitive coupling and inductive coupling |
| CN103296358A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Resonance cavity and tuning method of resonance cavity |
| CN104091985A (en) * | 2014-06-19 | 2014-10-08 | 华南理工大学 | Broadband filter with single-cavity four-mode cavity resonator |
| CN104934669A (en) * | 2015-06-15 | 2015-09-23 | 华南理工大学 | Double-frequency helical cavity filter with controllable bandwidth |
| CN109742493A (en) * | 2019-01-21 | 2019-05-10 | 淮阴工学院 | A kind of difference double-passband filter based on four mould dielectric resonators |
Non-Patent Citations (3)
| Title |
|---|
| Multi-mode wideband bandpass filters using waveguide cavities (invited);Sai-Wai Wong et.al;《2015 Asia-Pacific Microwave Conference (APMC)》;全文 * |
| 介质多模滤波器研究;黄庆涛;《中国优秀硕士学位论文全文数据库信息科技辑》(第第2期期);全文 * |
| 基于新型四模谐振器的双通带带通滤波器设计;孙久会;张德伟;王树兴;吕大龙;;强激光与粒子束(第05期);全文 * |
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