CN103035989B - Cavity filter crosswise coupled by double-layer coaxial cavity - Google Patents
Cavity filter crosswise coupled by double-layer coaxial cavity Download PDFInfo
- Publication number
- CN103035989B CN103035989B CN201210542331.9A CN201210542331A CN103035989B CN 103035989 B CN103035989 B CN 103035989B CN 201210542331 A CN201210542331 A CN 201210542331A CN 103035989 B CN103035989 B CN 103035989B
- Authority
- CN
- China
- Prior art keywords
- cavity
- coaxial
- coaxial cavity
- upper strata
- lower floor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a cavity filter crosswise coupled by a double-layer coaxial cavity. The cavity filter crosswise coupled by the double-layer coaxial cavity comprises a cavity shell 10. A hollow cavity in the cavity shell 10 is divided into an upper layer and a lower layer. A coupling wall 6 is arranged between the upper layer and the lower layer. Each layer is divided into a left single cavity, a middle single cavity and a right single cavity to form a left double-layer coaxial cavity, a middle double-layer coaxial cavity and a right double-layer coaxial cavity. The upper layer comprises a first upper layer coaxial cavity 21, a second upper layer coaxial cavity 22 and a third upper layer coaxial cavity 23. The lower layer comprises a first lower layer coaxial cavity 31, a second lower layer coaxial cavity 32 and a third lower layer coaxial cavity 33, wherein the first upper layer coaxial cavity 21 is provided with an input coaxial line port 1, and the third lower layer coaxial cavity 33 is provided with an output coaxial line port 2. The cavity filter crosswise coupled by the double-layer coaxial cavity is wide in frequency band, small in size, good in out-of-band rejection and high in power capacity. Main performance indexes can reach degrees that transmission band with 1 dB is from 1805 megahertzs to 1880 megahertzs, a low frequency end out-of-band rejection is >= 50 dB, a high frequency out-of-band rejection is >= 44 dB, and the requirements of sending the filter in an existing mobile communication base station are basically met.
Description
Technical field
The present invention is the cross-linked cavity body filter in a kind of double-layer coaxial chamber, and particularly a kind of double-layer coaxial chamber cross-couplings realizes the cavity body filter of wideband transmit and high out-of-side rejection, belongs to the renovation technique of the cross-linked cavity body filter in double-layer coaxial chamber.
Background technology
Because its electromagnetic wave shielding is good, in compact conformation, passband, Insertion Loss is low, volume is little and power capacity advantages of higher, is the first-selected kind of mobile communication base station emission filter for a long time always for metallic cavity filter.Adopt individual layer coaxial cavity cross-linked metallic cavity filter to have good Out-of-band rejection characteristic and be easy to the advantage such as tuning, but volume is large, structure is not compact constrains its application in some communication systems, and generally needs 7-8 coaxial cavity could realize the larger good Out-of-band rejection of 1dB bandwidth sum.The cavity body filter being elementary cell with the double-gap resonator that is coupled has good 1dB bandwidth potential, but there are some technology barriers owing to realizing cross-couplings between double gap chamber, so its Out-of-band rejection is difficult to the requirement reaching practical communication system.We are after further investigation, devise the cross-linked cavity body filter in a kind of double-layer coaxial chamber, the broadband of Coupling two-gap cavity filter and the advantage of cross-linked high out-of-side rejection are had concurrently, so less coaxial cavity unit can be adopted to realize the Out-of-band rejection of larger 1dB more than bandwidth sum 50dB, make to meet the Base Transmitter filter volume that Modern Mobile Communications Systems requires obviously to reduce, the compacter and various shapes of structure.
Summary of the invention
The object of the invention is to consider the problems referred to above and provide a kind of broadband, small size, Out-of-band rejection is good, and the cross-linked cavity body filter in double-layer coaxial chamber that power capacity is higher.The present invention is a kind of metallic cavity filter, can be used as the emission filter of mobile communication base station, also can be used for radar and other HIGH-POWERED MICROWAVES system.
Technical scheme of the present invention is: the cross-linked cavity body filter in double-layer coaxial chamber of the present invention, include cavity shell, hollow cavity set by cavity shell is divided into two-layer up and down, coupled wall is provided with between two-layer up and down, single chamber, three, left, center, right is divided into again in every layer, surround double-layer coaxial chamber, left, center, right, wherein upper strata includes upper strata first coaxial cavity, upper strata second coaxial cavity, upper strata the 3rd coaxial cavity, lower floor includes lower floor first coaxial cavity, lower floor second coaxial cavity, lower floor the 3rd coaxial cavity, its at the middle and upper levels first coaxial cavity be provided with input coaxial line port, lower floor the 3rd coaxial cavity is provided with output coaxial cable port, by the first barrier partitions between upper strata first coaxial cavity and upper strata second coaxial cavity, lower floor second coaxial cavity, separated by second baffle between lower floor the 3rd coaxial cavity, coupled wall bottom the coaxial cavity of upper strata first is provided with some openings, wherein the opening on right side is provided with the swash plate reaching lower floor second coaxial cavity, upper strata first coaxial cavity realizes being coupled with the opening be provided with by coupled wall between lower floor first coaxial cavity, lower floor first coaxial cavity realizes being coupled by the opening below swash plate with between lower floor second coaxial cavity, upper strata first coaxial cavity realizes being coupled by the R-joining that swash plate is formed between this two chamber with lower floor second coaxial cavity, upper strata first coaxial cavity, cross-couplings is formed between lower floor first coaxial cavity and lower floor second coaxial cavity, a horizontal joint and a vertical window is opened between upper strata second coaxial cavity and upper strata the 3rd coaxial cavity, " ten " font separation frame is provided with by vertical window place within the coaxial cavity of upper strata the 3rd, realize being coupled by horizontal joint and vertical window between upper strata second coaxial cavity with upper strata the 3rd coaxial cavity, upper strata the 3rd coaxial cavity realizes being coupled with the some openings be provided with by coupled wall between lower floor the 3rd coaxial cavity, upper strata second coaxial cavity realizes being coupled by horizontal joint and vertical window with between lower floor the 3rd coaxial cavity, upper strata second coaxial cavity, cross-couplings is formed between upper strata the 3rd coaxial cavity and lower floor the 3rd coaxial cavity.
The structure of cavity body filter of the present invention owing to adopting double-layer coaxial chamber cross-couplings to realize high out-of-side rejection, double-layer coaxial cavity body filter is made up of about 6 coaxial single chambeies.Instant invention overcomes existing individual layer coaxial cavity volume large, structure is compactness issue not, has had the advantage of the broadband of Coupling two-gap cavity filter and the high out-of-side rejection of individual layer coaxial cavity cross-coupling concurrently.Realize larger 1dB bandwidth sum high out-of-side rejection with less cavity, provide a kind of high-power, bandwidth, volume are little, lightweight and metallic cavity filter that Out-of-band rejection is high; Make to meet the Base Transmitter filter volume that Modern Mobile Communications Systems requires obviously to reduce, the compacter and various shapes of structure.Compared with prior art, tool of the present invention has the following advantages:
1, compared with former Coupling two-gap cavity body, when increase by two single chambeies, by the cross-couplings between double-layer coaxial cavity, Out-of-band rejection is made to increase to 50dB, and 1dB bandwidth does not reduce, the requirement of row mobile communication base station emission filter substantially can be met.
2, compared with the individual layer coupling coaxial cavity filter of 1dB bandwidth sum Out-of-band rejection similar nature, less coaxial cavity unit is have employed in double-layer coaxial cavity filter, its volume obviously reduces, the compacter and various shapes of structure, and through-put power capacity also significantly improves.
3, between double-layer coaxial chamber, carrying out cross-couplings to realize the way of high out-of-side rejection is the inventive process used first both at home and abroad, and the development of the coupling coaxial cavity filter for later sandwich construction is provided theory and technology support by this.
The present invention is that a kind of design is ingenious, function admirable, the convenient and practical cross-linked cavity body filter in double-layer coaxial chamber.Its main performance index can reach: 1dB passband 1805MHz ~ 1880MHz, low frequency end Out-of-band rejection >=50dB, and front end Out-of-band rejection >=44dB, can meet the requirement of existing mobile communication base station emission filter substantially.
Accompanying drawing explanation
Fig. 1 is the agent structure schematic diagram of double-layer coaxial cavity cross-coupled filter of the present invention.
Fig. 2 is the side cutaway view of double-layer coaxial cavity cross-coupled filter of the present invention.
Fig. 3 is the vertical view of double-layer coaxial cavity cross-coupled filter of the present invention.
Fig. 4 is the filtering characteristic Electromagnetic Simulation curve frequencies of double-layer coaxial cavity cross-coupled filter of the present invention and the schematic diagram of Out-of-band rejection.
Fig. 5 is the amplitude schematic diagram of the filtering characteristic Electromagnetic Simulation curve of double-layer coaxial cavity body filter of the present invention.
Embodiment
Embodiment:
Structural representation of the present invention is as Fig. 1, 2, shown in 3, the cross-linked cavity body filter in double-layer coaxial chamber of the present invention, include cavity shell 10, hollow cavity set by cavity shell 10 is divided into two-layer up and down, coupled wall 6 is provided with between two-layer up and down, single chamber, three, left, center, right is divided into again in every layer, surround double-layer coaxial chamber, left, center, right, wherein upper strata includes upper strata first coaxial cavity 21, upper strata second coaxial cavity 22, upper strata the 3rd coaxial cavity 23, lower floor includes lower floor first coaxial cavity 31, lower floor second coaxial cavity 32, lower floor the 3rd coaxial cavity 33, its at the middle and upper levels first coaxial cavity 21 be provided with input coaxial line port one, lower floor the 3rd coaxial cavity 33 is provided with output coaxial cable port 2, it is separated by the first baffle plate 4 between the first coaxial cavity 21 and upper strata second coaxial cavity 22 at the middle and upper levels, lower floor second coaxial cavity 32, separated by second baffle 7 between lower floor the 3rd coaxial cavity 33, coupled wall 6 bottom upper strata first coaxial cavity 21 is provided with some openings, wherein the opening on right side is provided with the swash plate 11 reaching lower floor second coaxial cavity 32, the opening be provided with by coupled wall 6 between upper strata first coaxial cavity 21 with lower floor first coaxial cavity 31 realizes being coupled, realize being coupled by the opening below swash plate 11 between lower floor first coaxial cavity 31 with lower floor second coaxial cavity 32, the R-joining that upper strata first coaxial cavity 21 is formed by swash plate 11 with lower floor second coaxial cavity 32 between this two chamber realizes being coupled, upper strata first coaxial cavity 21, cross-couplings is formed between lower floor first coaxial cavity 31 and lower floor second coaxial cavity 32, a horizontal joint 51 and a vertical window 52 is opened between upper strata second coaxial cavity 22 and upper strata the 3rd coaxial cavity 23, " ten " font separation frame 5 is provided with by vertical window 52 place in upper strata the 3rd coaxial cavity 23, realize being coupled by horizontal joint 51 and vertical window 52 between upper strata second coaxial cavity 22 with upper strata the 3rd coaxial cavity 23, upper strata the 3rd coaxial cavity 23 realizes being coupled with the some openings be provided with by coupled wall 6 between lower floor the 3rd coaxial cavity 33, upper strata second coaxial cavity 22 realizes being coupled by horizontal joint 51 and vertical window 52 with between lower floor the 3rd coaxial cavity 33, upper strata second coaxial cavity 22, cross-couplings is formed between upper strata the 3rd coaxial cavity 23 and lower floor the 3rd coaxial cavity 33.Two coaxial line port ones for I/O have been separately positioned on first, upper strata coaxial cavity and lower floor the 3rd coaxial cavity, reach the object of the fundamental resonance frequencies making full use of six single chambeies.In the present embodiment, cross-couplings is realized by " ten " font separation frame 5 between upper strata second coaxial cavity 22 and upper strata the 3rd coaxial cavity 23, this cross-coupled manner can not only the Out-of-band rejection of boostfiltering device greatly, can not have influence on again the transmission bandwidth of double-layer coaxial chamber 1dB.
In the present embodiment, the opening below above-mentioned swash plate 11 is rectangular aperture, realizes being coupled between lower floor first coaxial cavity 31 with lower floor second coaxial cavity 32 by the rectangular aperture below swash plate 11.
In the present embodiment, horizontal joint 51 and vertical window 52 are offered in the right side of above-mentioned upper strata second coaxial cavity 22, are provided with " ten " font separation frame 5 in upper strata the 3rd coaxial cavity 23 by vertical window 52 place.
In the present embodiment, above-mentioned coupled wall 6, first baffle plate 4, second baffle 7 are metallic plate, and separation frame 5 is metal frame.
The surrounding of above-mentioned coupled wall 6 has ten horizontal coupling slots 8 and three vertical coupled grooves 9 of the coupling realized between upper and lower two single chambeies.Be symmetrical arranged or be symmetrical set before and after above-mentioned ten horizontal coupling slots 8, three vertical coupled grooves 9 are arranged on the chamber wall between adjacent coaxial chamber and are arranged on the chamber wall of the coaxial cavity in the rightmost side.
The arrangement position of the cylindrical conductor 3 be provided with in above-mentioned upper and lower two-layer coaxial cavity staggers, so that upper and lower two-layer coaxial cavity realizes cross-couplings better.
The output coaxial cable port 2 that the input coaxial line port one that first, above-mentioned upper strata coaxial cavity 21 is provided with and lower floor the 3rd coaxial cavity 33 are provided with is the structures adopting coaxial inner conductor to be connected with conical conductor, input the capacitive coupling in coaxial line port one and first, upper strata coaxial cavity 21, output coaxial cable port 2 and the capacitive coupling in lower floor the 3rd coaxial cavity 33.
The upper surface of above-mentioned cavity shell 10 and lower surface are provided with convenient tuning perforate in kind.In the present embodiment, the upper surface of above-mentioned cavity shell 10 and lower surface are respectively equipped with four convenient tuning perforates in kind.
Double-layer coaxial chamber of the present invention cross-couplings realizes the cavity body filter of wideband transmit and high out-of-side rejection, by continuing to optimize cavity body structure and each coupling aperture, transmit frequency band 1805 ~ the 1880MHz of widely used communication system GSM-1800 can be worked in, also substantially meet the Out-of-band rejection required by communication system.
Claims (10)
1. the cross-linked cavity body filter in double-layer coaxial chamber, it is characterized in that including cavity shell, hollow cavity set by cavity shell is divided into two-layer up and down, coupled wall is provided with between two-layer up and down, single chamber, three, left, center, right is divided into again in every layer, surround double-layer coaxial chamber, left, center, right, wherein upper strata includes upper strata first coaxial cavity, upper strata second coaxial cavity, upper strata the 3rd coaxial cavity, lower floor includes lower floor first coaxial cavity, lower floor second coaxial cavity, lower floor the 3rd coaxial cavity, its at the middle and upper levels first coaxial cavity be provided with input coaxial line port, lower floor the 3rd coaxial cavity is provided with output coaxial cable port, by the first barrier partitions between upper strata first coaxial cavity and upper strata second coaxial cavity, lower floor second coaxial cavity, separated by second baffle between lower floor the 3rd coaxial cavity, coupled wall bottom the coaxial cavity of upper strata first is provided with some openings, wherein the opening on right side is provided with the swash plate reaching lower floor second coaxial cavity, upper strata first coaxial cavity realizes being coupled with the opening be provided with by coupled wall between lower floor first coaxial cavity, lower floor first coaxial cavity realizes being coupled by the opening below swash plate with between lower floor second coaxial cavity, upper strata first coaxial cavity realizes being coupled by the R-joining that swash plate is formed between this two chamber with lower floor second coaxial cavity, upper strata first coaxial cavity, cross-couplings is formed between lower floor first coaxial cavity and lower floor second coaxial cavity, a horizontal joint and a vertical window is opened between upper strata second coaxial cavity and upper strata the 3rd coaxial cavity, " ten " font separation frame is provided with by vertical window place in the coaxial cavity of upper strata the 3rd, realize being coupled by horizontal joint and vertical window between upper strata second coaxial cavity with upper strata the 3rd coaxial cavity, upper strata the 3rd coaxial cavity realizes being coupled with the some openings be provided with by coupled wall between lower floor the 3rd coaxial cavity, upper strata second coaxial cavity realizes being coupled by horizontal joint and vertical window with between lower floor the 3rd coaxial cavity, upper strata second coaxial cavity, cross-couplings is formed between upper strata the 3rd coaxial cavity and lower floor the 3rd coaxial cavity.
2. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 1, is characterized in that the opening below above-mentioned swash plate is rectangular aperture, and lower floor first coaxial cavity realizes being coupled by the rectangular aperture below swash plate with between lower floor second coaxial cavity.
3. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 1, is characterized in that horizontal joint and vertical window are offered in the right side of above-mentioned upper strata second coaxial cavity, is provided with " ten " font separation frame in the coaxial cavity of upper strata the 3rd by vertical window place.
4. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 1, it is characterized in that above-mentioned coupled wall, the first baffle plate, second baffle are metallic plate, separation frame is metal frame.
5. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 1, is characterized in that the surrounding of above-mentioned coupled wall has ten horizontal coupling slots and three vertical coupled grooves of the coupling realized between upper and lower two single chambeies.
6. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 5, it is characterized in that being symmetrical arranged or being symmetrical set before and after above-mentioned ten horizontal coupling slots, three vertical coupled grooves are separately positioned on the chamber wall between adjacent coaxial chamber and are arranged on the chamber wall of the coaxial cavity in the rightmost side.
7. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 1, is characterized in that the arrangement position of the cylindrical conductor be provided with in above-mentioned upper and lower two-layer coaxial cavity staggers.
8. the cross-linked cavity body filter in double-layer coaxial chamber according to any one of claim 1 to 7, it is characterized in that the output coaxial cable port that input coaxial line port that first, above-mentioned upper strata coaxial cavity is provided with and lower floor the 3rd coaxial cavity are provided with is the structure adopting coaxial inner conductor to be connected with conical conductor, capacitive coupling in input coaxial line port and first, upper strata coaxial cavity, the capacitive coupling in output coaxial cable port and lower floor the 3rd coaxial cavity.
9. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 8, is characterized in that the upper surface of above-mentioned cavity shell and lower surface are provided with convenient tuning perforate in kind.
10. the cross-linked cavity body filter in double-layer coaxial chamber according to claim 9, is characterized in that the upper surface of above-mentioned cavity shell and lower surface being respectively equipped with four convenient tuning perforates in kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210542331.9A CN103035989B (en) | 2012-12-14 | 2012-12-14 | Cavity filter crosswise coupled by double-layer coaxial cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210542331.9A CN103035989B (en) | 2012-12-14 | 2012-12-14 | Cavity filter crosswise coupled by double-layer coaxial cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103035989A CN103035989A (en) | 2013-04-10 |
| CN103035989B true CN103035989B (en) | 2015-04-15 |
Family
ID=48022634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210542331.9A Active CN103035989B (en) | 2012-12-14 | 2012-12-14 | Cavity filter crosswise coupled by double-layer coaxial cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103035989B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684514B (en) * | 2016-11-16 | 2019-05-28 | 南通大学 | A kind of double coaxial cavity bandpass filters of difference |
| WO2021022471A1 (en) | 2019-08-06 | 2021-02-11 | 罗森伯格技术（昆山）有限公司 | Cross-coupled filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5781085A (en) * | 1996-11-27 | 1998-07-14 | L-3 Communications Narda Microwave West | Polarity reversal network |
| US20020180559A1 (en) * | 2001-05-31 | 2002-12-05 | Sei-Joo Jang | Dielectric resonator loaded metal cavity filter |
| CN101185193A (en) * | 2005-05-30 | 2008-05-21 | 松下电器产业株式会社 | Microwave filter including an end-wall coupled coaxial resonator |
| CN101626101A (en) * | 2009-08-11 | 2010-01-13 | 京信通信系统（中国）有限公司 | Cavity medium filter and out-band rejection method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5812036A (en) * | 1995-04-28 | 1998-09-22 | Qualcomm Incorporated | Dielectric filter having intrinsic inter-resonator coupling |
| EP1715544B1 (en) * | 2005-04-20 | 2008-08-13 | Matsushita Electric Industrial Co., Ltd. | Block filter |
| US7777598B2 (en) * | 2008-04-14 | 2010-08-17 | Radio Frequency Systems, Inc. | Dielectric combine cavity filter having ceramic resonator rods suspended by polymer wedge mounting structures |
| US7764146B2 (en) * | 2008-06-13 | 2010-07-27 | Com Dev International Ltd. | Cavity microwave filter assembly with lossy networks |
| CN101521303B (en) * | 2009-04-09 | 2012-11-07 | 成都赛纳赛德科技有限公司 | Folded waveguide filter |
-
2012
- 2012-12-14 CN CN201210542331.9A patent/CN103035989B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5781085A (en) * | 1996-11-27 | 1998-07-14 | L-3 Communications Narda Microwave West | Polarity reversal network |
| US20020180559A1 (en) * | 2001-05-31 | 2002-12-05 | Sei-Joo Jang | Dielectric resonator loaded metal cavity filter |
| CN101185193A (en) * | 2005-05-30 | 2008-05-21 | 松下电器产业株式会社 | Microwave filter including an end-wall coupled coaxial resonator |
| CN101626101A (en) * | 2009-08-11 | 2010-01-13 | 京信通信系统（中国）有限公司 | Cavity medium filter and out-band rejection method |
Non-Patent Citations (1)
| Title |
|---|
| 以耦合双间隙为基本单元的多腔体滤波器的研究;赵培伟;《中国优秀硕士学位论文全文数据库信息科技辑》;20120915(第9期);第44-49页第4.1节及附图4-2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103035989A (en) | 2013-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10873119B2 (en) | Filter and wireless network device | |
| CN210182538U (en) | Duplexer and communication equipment | |
| CN102709630B (en) | Filter of satellite communication earth station receiver | |
| CN103682535B (en) | Coaxial cavity dual-band filter based on Stepped Impedance structure | |
| CN103035989B (en) | Cavity filter crosswise coupled by double-layer coaxial cavity | |
| CN210778910U (en) | Filter coupling unit and filter | |
| CN208352501U (en) | A kind of highly selective miniaturized duplexer | |
| CN103647123B (en) | Half mode substrate integration waveguide horizontal symmetrical filter | |
| CN109390644B (en) | Double-cavity four-mode dielectric waveguide filter | |
| CN104241797A (en) | Resonant cavity for coaxial resonant diplexer, and coaxial resonant diplexer thereof | |
| CN203644914U (en) | Coaxial cavity dual-band filter based on step impedance structure | |
| CN108011162B (en) | Dielectric filter with hybrid coupling structure | |
| CN111509344B (en) | OMT duplexer based on high-isolation cross-junction coupler | |
| CN210430050U (en) | Coaxial cavity duplexer | |
| CN211320273U (en) | Dielectric waveguide filter capable of realizing single out-of-band transmission zero | |
| CN203326078U (en) | Resonant cavity applied to coaxial resonant duplexer and coaxial resonant duplexer | |
| CN202888369U (en) | GSM&DCS/TDA&TDF&TDE multifrequency combiner | |
| CN202871953U (en) | Three-frequency combiner | |
| CN107749508B (en) | Single ridge waveguide low pass filter and waveguide duplexer | |
| CN106785252A (en) | New resistance filter apparatus | |
| CN203406397U (en) | Coupling structure of coaxial cavity filter | |
| CN101098035B (en) | Waveguide antenna aperture metal bar coupled structure | |
| CN204577550U (en) | A kind of tunable high power Waveguide bandstop filter | |
| CN210093219U (en) | Multi-frequency band signal combiner | |
| CN203644909U (en) | Whole-cavity-type quadriplexer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |