CN103413996B - Ka-band millimeter wave broadside-coupled band-pass filter of LTCC - Google Patents
Ka-band millimeter wave broadside-coupled band-pass filter of LTCC Download PDFInfo
- Publication number
- CN103413996B CN103413996B CN201310332897.3A CN201310332897A CN103413996B CN 103413996 B CN103413996 B CN 103413996B CN 201310332897 A CN201310332897 A CN 201310332897A CN 103413996 B CN103413996 B CN 103413996B
- Authority
- CN
- China
- Prior art keywords
- resonant cavity
- strip line
- ground plate
- coupled
- jointly
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a Ka-band millimeter wave broadside-coupled band-pass filter of LTCC. The filter comprises a front metal wall, a rear metal wall, an upper earth plate, a lower earth plate, an input port, an output port, five layers of earth plates, ten strip lines and three middle metal posts, wherein the input port and the output port are formed in the surface of the filter, the earth plates are internally connected with the strip liens in fault portions, and the ten strip lines and the three middle metal posts are internally connected with the earth plates. The Ka-band millimeter wave broadside-coupled band-pass filter has the advantages of being small in transverse area, low in weight, high in reliability, low in large-scale production cost and the like. A millimeter wave frequency band is the main frequency band in technological development of current military electronics, and is widely used in corresponding systems with strict requirements for size, weight, performance and reliability such as radars, communication, precision guidance, and the electronic countermeasure and testing technology.
Description
Technical field
The present invention relates to a kind of filter, particularly the broadside coupled band pass filter of Ka wave band millimeter wave of a kind of LTCC.
Background technology
Microwave filter is the lossless two-port network of a class, be widely used in microwave communication, radar, electronic countermeasures and microwave measuring instrument, be used for the frequency response of control signal in systems in which, make useful signal frequency component almost undampedly by filter, and block the transmission of unwanted signal frequency component.In practical engineering application, from wave filter technology index given to processed finished products required time by shorter and shorter, design the inexorable trend that high performance microwave filter will be engineering design and market competition fast and accurately.Along with the development of science and technology, continuing to bring out of new material, new technology, as developing rapidly of semiconductor technology, various new RFIC and module emerge in an endless stream, the design cycle of microwave, millimeter wave/RF active circuit is constantly shortened, and circuit height is integrated, volume is more and more less.Therefore, design performance is high, volume is little, cost is low and shorten the filter lead time, is the inevitable requirement of market competition.Based on the filter of LTCC technology design, owing to having, size is little, performance good, reliability is high, low cost and other advantages and being paid close attention to widely.
Millimeter wave frequency band is the main frequency range of current Military Electronics technical development, is widely used in radar, communication, precise guidance, the aspect such as electronic countermeasures and measuring technology.In broadband and ultra-wideband channel transmitting-receiving subassembly, filter is as requisite part, and the quality of its performance will directly have influence on the performance of whole transmitting-receiving subassembly.Traditional end coupling filter limits by microwave printed board processing technology, and coupling gap can not be done very little, and therefore bandwidth can not be accomplished wider.Adopt suspension microstrip structure to increase bandwidth, but be unfavorable for Planar integration.Adopt the filter of sandwich construction then can well overcome the above problems.The LTCC technology of rising in recent years is a kind of effective means of design Multilayer filter.On the other hand, the resonant element of comb line filter is all half-wavelengths, and when progression is less, its stopband suppresses poor, increases progression and can improve stopband suppression but can increase filter size undoubtedly.Describe the broadside coupled band pass filter of a kind of multilayer herein.It is from conventional combline filters, by adopting LTCC sandwich construction to realize coupling, again by vertically being placed by the resonant element in traditional pectinate line filter, adds belt resistance inhibitor system when not increasing filter order.This filter is all imbedded in ltcc substrate, can save more surface and be provided with source chip, achieve the compact design of circuit size.
Summary of the invention
The object of the present invention is to provide the broadside coupled band pass filter of Ka wave band millimeter wave of the LTCC that a kind of area occupied is little, lightweight, reliability is high, temperature performance is stablized, cost is low.
The technical scheme realizing the object of the invention is: the broadside coupled band pass filter of Ka wave band millimeter wave of a kind of LTCC, it is characterized in that the metallic walls comprising front and rear surfaces, upper and lower ground plate, the ground plate of strip line is connect in defect part, input export strip line, middle three metal columns, input port, output port that surface is installed.
The present invention compared with prior art, its remarkable advantage is: the broadside coupled band pass filter of Ka wave band millimeter wave of (1) LTCC, utilize multilayer LTCC technique (LTCC) feature, adopt the Space Coupling between stereoscopic multi-layer strip line cavity resonator structure generation resonant cavity; (2) resonant cavity is vertically placed from top to bottom, compared with common LTCC comb line filter, in identical progression situation, greatly reduces device area occupied; (3) ground plane at resonant cavity microstrip line place reduces the stiffness of coupling between resonant cavity, can realize bandwidth and reduce in less vertical space, in addition, can regulate the stiffness of coupling between resonant cavity by the vertical range changed between ground plane.
Accompanying drawing explanation
Fig. 1 is profile and the internal structure schematic diagram of the broadside coupled band-pass filter device of Ka wave band millimeter wave of LTCC of the present invention.
Fig. 2 is the Ka wave band millimeter wave broadside coupled band pass filter three-dimensional full-wave simulation performance curve of LTCC of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Composition graphs 1, Fig. 2, the present invention is the broadside coupled band pass filter of Ka wave band millimeter wave of a kind of LTCC, this filter comprises the metallic walls of front and rear surfaces, upper and lower ground plate, five layers of ground plate connecing strip line in defect part, input port P1 is connected with the interior strip line L1 being connected to ground plate 1, output port P2 is connected with the interior strip line L10 being connected to ground plate 1, middle three metal column upper ends are connected with ground plate 1, lower end is connected with ground plate 4, middle through ground plate 2, 3, input port P1 mono-termination input signal, the other end meets strip line L1, output port P2 mono-termination outputs signal, the other end meets strip line L10, strip line L1 mono-termination ground plate 1, the other end is opened a way, and side meets input port P1, strip line L10 mono-termination ground plate 10, the other end is opened a way, and side meets output port P2, strip line L2 mono-termination ground plate 2, the other end is opened a way, L9 mono-termination ground plate 2, open a way in one end, strip line L3 mono-termination ground plate 3, open a way in one end, strip line L8 mono-termination ground plate 3, open a way in one end, strip line L4 mono-termination ground plate 4, open a way in one end, strip line L7 mono-termination ground plate 4, open a way in one end, strip line L5 mono-termination ground plate 5, open a way in one end, strip line L6 mono-termination ground plate 5, open a way in one end, neighboring second loops to connect ground plate end contrary, three metal column upper ends that centre position is placed connect with ground plate 1, and lower end connects with ground plate 4, middle through ground plate 2, ground plate 3.Wherein, the defective voids C1 between strip line L1 and ground plate 1, strip line L1 form the first resonant cavity jointly; Defective voids C2 between strip line L2 and ground plate 2, strip line L2 form the second resonant cavity jointly; Defective voids C3 between strip line L3 and ground plate 3, strip line L3 form the 3rd resonant cavity jointly; Defective voids C4 between strip line L4 and ground plate 4, strip line L4 form the 4th resonant cavity jointly; Defective voids C5 between strip line L5 and ground plate 5, strip line L5 form the 5th resonant cavity jointly; Defective voids C6 between strip line L6 and ground plate 5, strip line L6 form the 6th resonant cavity jointly; Defective voids C7 between strip line L7 and ground plate 4, strip line L7 form the 7th resonant cavity jointly; Defective voids C8 between strip line L8 and ground plate 3, strip line L8 form the 8th resonant cavity jointly; Defective voids C9 between strip line L9 and ground plate 2, strip line L9 form the 9th resonant cavity jointly; Defective voids C10 between strip line L10 and ground plate 1, strip line L10 form the tenth resonant cavity jointly; First resonant cavity (L1, C1) and the second resonant cavity (L2, C2) form coupled room (L12, C12); Second resonant cavity (L2, C2) and the 3rd resonant cavity (L3, C3) form coupled room (L23, C23); 3rd resonant cavity (L3, C3) and the 4th resonant cavity (L4, C4) form coupled room (L34, C34); 4th resonant cavity (L4, C4) and the 5th resonant cavity (L5, C5) form coupled room (L45, C45); 6th resonant cavity (L6, C6) and the 7th resonant cavity (L7, C7) form coupled room (L67, C67); 7th resonant cavity (L7, C7) and the 8th resonant cavity (L8, C8) form coupled room (L78, C78); 8th resonant cavity (L8, C8) and the 9th resonant cavity (L9, C9) form coupled room (L89, C89); 9th resonant cavity (L9, C9) and the tenth resonant cavity (L10, C10) form coupled room (L(9,10), C(9,10)).
Composition graphs 1, Fig. 2, the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC of the present invention, defective voids C1 between strip line L1 and ground plate 1, strip line L1 form the first resonant cavity jointly, the resonance frequency of resonant cavity (L1, C1) can be adjusted by the length of adjustment strip line L1, width; Defective voids C2 between strip line L2 and ground plate 2, strip line L2 form the second resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L2, C2) by the length of adjustment strip line L2, width; Defective voids C3 between strip line L3 and ground plate 3, strip line L3 form the 3rd resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L3, C3) by the length of adjustment strip line L3, width; Defective voids C4 between strip line L4 and ground plate 4, strip line L4 form the 4th resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L4, C4) by the length of adjustment strip line L4, width; Defective voids C5 between strip line L5 and ground plate 5, strip line L5 form the 5th resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L5, C5) by the length of adjustment strip line L5, width; Defective voids C6 between strip line L6 and ground plate 5, strip line L6 form the 6th resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L6, C6) by the length of adjustment strip line L6, width; Defective voids C7 between strip line L7 and ground plate 4, strip line L7 form the 7th resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L7, C7) by the length of adjustment strip line L7, width; Defective voids C8 between strip line L8 and ground plate 3, strip line L8 form the 8th resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L8, C8) by the length of adjustment strip line L8, width; Defective voids C9 between strip line L9 and ground plate 2, strip line L9 form the 9th resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L9, C9) by the length of adjustment microstrip line L9, width; Defective voids C10 between strip line L10 and ground plate 1, strip line L10 form the first resonant cavity jointly, can be adjusted the resonance frequency of resonant cavity (L10, C10) by the length of adjustment strip line L10, width.
Composition graphs 1 and Fig. 2, the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC of the present invention, comprises ten resonant cavity (L1, C1), (L2, C2), (L3, C3), (L4, C4), (L5, C5), (L6, C6), (L7, C7), (L8, C8), (L9, C9), (L10, C10).Resonant cavity (L1, C1), resonant cavity (L2, C2) by coupled room (L12, C12) be coupled, resonant cavity (L2, C2), resonant cavity (L3, C3) by coupled room (L23, C23) be coupled, resonant cavity (L3, C3), resonant cavity (L4, C4) by coupled room (L34, C34) be coupled, resonant cavity (L4, C4), resonant cavity (L5, C5) by coupled room (L45, C45) be coupled, resonant cavity (L6, C1), resonant cavity (L7, C7) by coupled room (L67, C67) be coupled, resonant cavity (L7, C7), resonant cavity (L8, C8) by coupled room (L78, C78) be coupled, resonant cavity (L8, C8), resonant cavity (L9, C9) by coupled room (L89, C89) be coupled, resonant cavity (L9, C9), resonant cavity (L10, C10) by coupled room (L(9, 10), C(9, 10)) be coupled.
The broadside coupled band pass filter of Ka wave band millimeter wave of LTCC of the present invention, its operation principle is summarized as follows: the microwave signal of input arrives resonant cavity (L1 through input port P1, C1), arrive resonant cavity (L1, C1) microwave signal is by coupled room (L12, C12) resonant cavity (L2 is coupled to, C2), arrive resonant cavity (L2, C2) microwave signal is by coupled room (L23, C23) resonant cavity (L3 is coupled to, C3), arrive resonant cavity (L3, C3) microwave signal is by coupled room (L34, C34) resonant cavity (L4 is coupled to, C4), arrive resonant cavity (L4, C4) microwave signal is by coupled room (L45, C45) resonant cavity (L5 is coupled to, C5), arrive resonant cavity (L5, C5) microwave signal is transferred to resonant cavity (L6 by strip line L13, C6), arrive resonant cavity (L6, C6) microwave signal is by coupled room (L67, C67) resonant cavity (L7 is coupled to, C7), arrive resonant cavity (L7, C7) microwave signal is by coupled room (L78, C78) resonant cavity (L8 is coupled to, C8), arrive resonant cavity (L8, C8) microwave signal is by coupled room (L89, C89) resonant cavity (L9 is coupled to, C9), arrive resonant cavity (L9, C9) microwave signal is by coupled room (L(9, 10), C(9, 10) resonant cavity (L10) is coupled to, C10).When keeping width constant, the resonance frequency of each resonant cavity can be changed by the length changing strip line L1, L2, L3, L4, L5, L6, L7, L8, L9, L10.When vertical range between maintenance five layers of ground plane is constant, the size changing the lap area between neighbouring strip line can regulate the stiffness of coupling between resonant cavity, such as: the size of the lap area between change strip line L1, L2 can change the stiffness of coupling between resonant cavity (L1, C1) and resonant cavity (L2, C2).In addition, when keeping strip line relative position constant, the vertical range changed between resonant cavity also can change the stiffness of coupling between resonant element.
The size that the present invention is based on the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC is only 1.5mm × 1.5mm × 1.1mm, its performance can be as can be seen from Figure 2, pass band width is 31GHz ~ 34GHz, in passband, minimum insertion loss is 3.5dB, return loss is better than 12dB, lower sideband suppresses to be better than 50dB, and upper sideband suppresses to be better than 40dB.
Claims (3)
1. the broadside coupled band pass filter of Ka wave band millimeter wave of a LTCC, it is characterized in that: the metallic walls comprising front and rear surfaces, upper and lower ground plate, five layers connect the ground plate of strip line, the Shu Ru output port be connected with the interior strip line being connected to ground plate, middle three metal columns in defect part, and input port (P1) is the tap, the output port P2 that are connected with strip line L1 is the tap be connected with strip line L10; Input port (P1) one termination input signal, another termination input tape shape line (L1), output port P2 mono-termination outputs signal, and the other end meets strip line L10; Strip line L1 mono-termination ground plate 1, the other end is opened a way, and side meets input port P1; Strip line L10 mono-termination ground plate 10, the other end is opened a way, and side meets output port P2; Strip line L2 mono-termination ground plate 2, the other end is opened a way; Strip line L9 mono-termination ground plate 2, open a way in one end; Strip line L3 mono-termination ground plate 3, open a way in one end; Strip line L8 mono-termination ground plate 3, open a way in one end; Strip line L4 mono-termination ground plate 4, open a way in one end; Strip line L7 mono-termination ground plate 4, open a way in one end; Strip line L5 mono-termination ground plate 5, open a way in one end; Strip line L6 mono-termination ground plate 5, open a way in one end; The earth terminal position of neighboring second loops is contrary; Middle three metal column upper ends connect with ground plate 1, and lower end connects with ground plate 4, middle through ground plate 2, ground plate 3; Wherein, the defective voids C1 between strip line L1 and ground plate 1, strip line L1 form the first resonant cavity jointly; Defective voids C2 between strip line L2 and ground plate 2, strip line L2 form the second resonant cavity jointly; Defective voids C3 between strip line L3 and ground plate 3, strip line L3 form the 3rd resonant cavity jointly; Defective voids C4 between strip line L4 and ground plate 4, strip line L4 form the 4th resonant cavity jointly; Defective voids C5 between strip line L5 and ground plate 5, strip line L5 form the 5th resonant cavity jointly; Defective voids C6 between strip line L6 and ground plate 5, strip line L6 form the 6th resonant cavity jointly; Defective voids C7 between strip line L7 and ground plate 4, strip line L7 form the 7th resonant cavity jointly; Defective voids C8 between strip line L8 and ground plate 3, strip line L8 form the 8th resonant cavity jointly; Defective voids C9 between strip line L9 and ground plate 2, strip line L9 form the 9th resonant cavity jointly; Defective voids C10 between strip line L10 and ground plate 1, strip line L10 form the tenth resonant cavity jointly; First resonant cavity and the second resonant cavity form the first coupled room; Second resonant cavity and the 3rd resonant cavity form the second coupled room; 3rd resonant cavity and the 4th resonant cavity form the 3rd coupled room; 4th resonant cavity and the 5th resonant cavity form the 4th coupled room; 6th resonant cavity and the 7th resonant cavity form the 7th coupled room; 7th resonant cavity and the 8th resonant cavity form the 8th coupled room; 8th resonant cavity and the 9th resonant cavity form the 9th coupled room; 9th resonant cavity and the tenth resonant cavity form the tenth coupled room.
2. the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC according to claim 1, is characterized in that: the first coupled room by the first resonant cavity and the second resonant cavity by broadside coupled generation; Second coupled room by the second resonant cavity and the 3rd resonant cavity by broadside coupled generation; 3rd coupled room by the 3rd resonant cavity and the 4th resonant cavity by broadside coupled generation; 4th coupled room by the 4th resonant cavity and the 5th resonant cavity by broadside coupled generation; 7th coupled room by the 6th resonant cavity and the 7th resonant cavity by broadside coupled generation; 8th coupled room by the 7th resonant cavity and the 8th resonant cavity by broadside coupled generation; 9th coupled room by the 8th resonant cavity and the 9th resonant cavity by broadside coupled generation; Tenth coupled room by the 9th resonant cavity and the tenth resonant cavity by broadside coupled generation; 5th resonant cavity is directly connected with the 6th resonant cavity by microstrip line L13.
3. the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC according to claim 1, it is characterized in that: the defective voids C1 between strip line L1 and ground plate 1, strip line L1 form the first resonant cavity jointly, the resonance frequency of the first resonant cavity can be adjusted by the length of adjustment strip line L1; Defective voids C2 between strip line L2 and ground plate 2, strip line L2 form the second resonant cavity jointly, can be adjusted the resonance frequency of the second resonant cavity by the length of adjustment strip line L2; Defective voids C3 between strip line L3 and ground plate 3, strip line L3 form the 3rd resonant cavity jointly, can be adjusted the resonance frequency of the 3rd resonant cavity by the length of adjustment strip line L3; Defective voids C4 between strip line L4 and ground plate 4, strip line L4 form the 4th resonant cavity jointly, can be adjusted the resonance frequency of the 4th resonant cavity by the length of adjustment strip line L4; Defective voids C5 between strip line L5 and ground plate 5, strip line L5 form the 5th resonant cavity jointly, can be adjusted the resonance frequency of the 5th resonant cavity by the length of adjustment strip line L5; Defective voids C6 between strip line L6 and ground plate 5, strip line L6 form the 6th resonant cavity jointly, can be adjusted the resonance frequency of the 6th resonant cavity by the length of adjustment strip line L6; Defective voids C7 between strip line L7 and ground plate 4, strip line L7 form the 7th resonant cavity jointly, can be adjusted the resonance frequency of the 7th resonant cavity by the length of adjustment strip line L7; Defective voids C8 between strip line L8 and ground plate 3, strip line L8 form the 8th resonant cavity jointly, can be adjusted the resonance frequency of the 8th resonant cavity by the length of adjustment strip line L8; Defective voids C9 between strip line L9 and ground plate 2, strip line L9 form the 9th resonant cavity jointly, can be adjusted the resonance frequency of the 9th resonant cavity by the length of adjustment strip line L9; Defective voids C10 between strip line L10 and ground plate 1, strip line L10 form the tenth resonant cavity jointly, can be adjusted the resonance frequency of the tenth resonant cavity by the length of adjustment strip line L10; Middle three metal columns play the effect of the coupling between the resonant cavity of isolation left and right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310332897.3A CN103413996B (en) | 2013-08-01 | 2013-08-01 | Ka-band millimeter wave broadside-coupled band-pass filter of LTCC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310332897.3A CN103413996B (en) | 2013-08-01 | 2013-08-01 | Ka-band millimeter wave broadside-coupled band-pass filter of LTCC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103413996A CN103413996A (en) | 2013-11-27 |
| CN103413996B true CN103413996B (en) | 2015-07-01 |
Family
ID=49606992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310332897.3A Expired - Fee Related CN103413996B (en) | 2013-08-01 | 2013-08-01 | Ka-band millimeter wave broadside-coupled band-pass filter of LTCC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103413996B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956984A (en) * | 2014-04-08 | 2014-07-30 | 南京理工大学 | Multilayer structure body with filtering performance |
| JP6784184B2 (en) * | 2017-02-03 | 2020-11-11 | Tdk株式会社 | Bandpass filter |
| CN108461881B (en) * | 2018-03-20 | 2020-03-27 | 中国电子科技集团公司第二十九研究所 | LTCC substrate microwave signal transmission structure and manufacturing method thereof |
| CN110635201B (en) * | 2019-08-26 | 2021-09-21 | 中国电子科技集团公司第十三研究所 | Comb filter |
| CN112164846B (en) * | 2020-09-10 | 2022-04-29 | 武汉凡谷电子技术股份有限公司 | Millimeter wave band-pass filter |
-
2013
- 2013-08-01 CN CN201310332897.3A patent/CN103413996B/en not_active Expired - Fee Related
Non-Patent Citations (3)
| Title |
|---|
| LTCC 宽边耦合交指型超宽带滤波器设计;惠力等;《信息与电子工程》;20111031;第9卷(第5期);第582-585页 * |
| Miniaturized LTCC Wideband Bandpass Filter using Lumped-element Shunt LC Resonators;Yong-Sheng Dai 等;《IEEE》;20121231;全文 * |
| 小型化多层带线谐振腔缺陷地结构LTCC宽带带通滤波器;张祥军等;《微波学报》;20081031;第24卷(第5期);第58-61页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103413996A (en) | 2013-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103413996B (en) | Ka-band millimeter wave broadside-coupled band-pass filter of LTCC | |
| KR101442220B1 (en) | Multilayer-type dielectric waveguide filter including notch pole | |
| CN103187603A (en) | Wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on magnetoelectric coupling counteraction technology | |
| CN103413997B (en) | Vertical interdigital LTCC band pass filter | |
| CN104934663A (en) | Broadband high-selectivity balanced band-pass filter based on multimode resonators | |
| CN110098454B (en) | Single-body double-path balanced filter and radio frequency front-end circuit | |
| CN103986438A (en) | Laminated plate type filter | |
| CN102610880B (en) | Plane miniaturization communication band-pass filter with broadband external inhibition characteristic | |
| CN104953212A (en) | UHF (ultra high frequency) band type miniature microwave filter bank | |
| CN103236572A (en) | Compact microwave distributed double-mold band-pass filter | |
| US20080117004A1 (en) | High-frequency filter having electromagnetically-coupled branch lines | |
| CN103972619A (en) | UHF wave band high-performance band-pass filter | |
| CN105489980A (en) | High-isolation low-pass and band-pass triplexer | |
| CN110611144B (en) | Miniaturized broadband forward wave directional coupler unit circuit | |
| CN108767377A (en) | A kind of commutator load phase shifter | |
| US20200389145A1 (en) | Filter module | |
| CN102136615A (en) | LTCC-based miniaturized X-wave band band-pass filter | |
| CN105048027A (en) | L-band miniature double-microwave balance power dividing filter | |
| CN102637930A (en) | Substrate-insertion type rectangular waveguide band elimination filter | |
| CN108777342B (en) | Filter and method for generating resonance mode and equivalent capacitance | |
| CN202564510U (en) | Low loss radiofrequency plane integration band-pass filter | |
| CN104966875A (en) | Microwave millimeter wave active balance filtering power divider | |
| CN105244573A (en) | Dual-mode high-performance balance band-pass filter based on E-shaped resonators | |
| CN104967423A (en) | UHF waveband miniature duplexer | |
| CN104967424A (en) | UHF and SHF waveband miniature duplexer |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20200801 |