CN103413996A - 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
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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 the broadside coupled band pass filter of Ka wave band millimeter wave of a kind of filter, particularly 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, in system, be used for the frequency response of control signal, make useful signal frequency component almost undampedly by filter, and the transmission of blocking-up unwanted signal frequency component.In practical engineering application, by shorter and shorter, design fast and accurately the inexorable trend that high performance microwave filter will be engineering design and market competition from wave filter technology index given to the processed finished products required time.Along with scientific and technical development, the 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, make the design cycle of microwave, millimeter wave/RF active circuit constantly shorten, 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 art designs, size is little, performance good, reliability is high owing to having, low cost and other advantages is 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 aspects 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 is limited by the microwave printed board processing technology, and the coupling gap can not be done very littlely, so bandwidth can not be accomplished wider.The employing microstrip structure that suspends can increase bandwidth, but is unfavorable for Planar integration.Adopt the filter of sandwich construction 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 was less, its stopband suppressed poor, increases progression and can improve the stopband inhibition but can increase filter size undoubtedly.This paper has introduced the broadside coupled band pass filter of a kind of multilayer.It realizes coupling from the conventional combline filter by adopting the LTCC sandwich construction, by the resonant element in the pectinate line filter by traditional, vertically places again, has increased belt resistance inhibitor system in the situation that do not increase filter order.This filter is all imbedded in ltcc substrate, can save more surface source chip is installed, and has realized 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 that realizes 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 comprising the metallic walls of front and rear surfaces, upper and lower ground plate, in defect part, connect the ground plate of strip line, the input output strip line, middle three metal columns, input port, the output port that install on surface.
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) characteristics, adopt stereoscopic multi-layer strip line cavity resonator structure to produce the Space Coupling between resonant cavity; (2) resonant cavity is vertically placed from top to bottom, compares with common LTCC comb line filter, in identical progression situation, greatly reduces the device area occupied; (3) ground plane at resonant cavity microstrip line place has weakened the stiffness of coupling between resonant cavity, can in less vertical space, realize that bandwidth reduces, and in addition, can regulate the stiffness of coupling between resonant cavity by the vertical range changed between ground plane.
The 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 three-dimensional full-wave simulation performance curve of the broadside coupled band pass filter of the Ka wave band millimeter wave of LTCC of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
In conjunction with Fig. 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 that connects strip line in defect part, input port P1 with in be connected to ground plate 1 strip line L1 be connected, output port P2 with in be connected to ground plate 1 strip line L10 be connected, middle three metal column upper ends are connected with ground plate 1, lower end is connected with ground plate 4, ground plate 2 is passed in centre, 3, input port P1 mono-termination input signal, the other end meets strip line L1, output port P2 mono-termination output signal, the other end meets strip line L10, strip line L1 mono-termination ground plate 1, other end open circuit, side meets input port P1, strip line L10 mono-termination ground plate 10, other end open circuit, side meets output port P2, strip line L2 mono-termination ground plate 2, other end open circuit, L9 mono-termination ground plate 2, one end open circuits, strip line L3 mono-termination ground plate 3, one end open circuits, strip line L8 mono-termination ground plate 3, one end open circuits, strip line L4 mono-termination ground plate 4, one end open circuits, strip line L7 mono-termination ground plate 4, one end open circuits, strip line L5 mono-termination ground plate 5, one end open circuits, strip line L6 mono-termination ground plate 5, one end open circuits, adjacent strip line to connect the ground plate end opposite, three metal column upper ends and the ground plate 1 that place in centre position join, and lower end and ground plate 4 join, and ground plate 2, ground plate 3 are passed in centre.Wherein, common first resonant cavity that forms of the defective voids C1 between strip line L1 and ground plate 1, strip line L1; Common second resonant cavity that forms of defective voids C2 between strip line L2 and ground plate 2, strip line L2; Common the 3rd resonant cavity that forms of defective voids C3 between strip line L3 and ground plate 3, strip line L3; Common the 4th resonant cavity that forms of defective voids C4 between strip line L4 and ground plate 4, strip line L4; Common the 5th resonant cavity that forms of defective voids C5 between strip line L5 and ground plate 5, strip line L5; Common the 6th resonant cavity that forms of defective voids C6 between strip line L6 and ground plate 5, strip line L6; Common the 7th resonant cavity that forms of defective voids C7 between strip line L7 and ground plate 4, strip line L7; Common the 8th resonant cavity that forms of defective voids C8 between strip line L8 and ground plate 3, strip line L8; Common the 9th resonant cavity that forms of defective voids C9 between strip line L9 and ground plate 2, strip line L9; Common the tenth resonant cavity that forms of defective voids C10 between strip line L10 and ground plate 1, strip line L10; The first resonant cavity (L1, C1) forms coupled room (L12, C12) with the second resonant cavity (L2, C2); The second resonant cavity (L2, C2) forms coupled room (L23, C23) with the 3rd resonant cavity (L3, C3); The 3rd resonant cavity (L3, C3) forms coupled room (L34, C34) with the 4th resonant cavity (L4, C4); The 4th resonant cavity (L4, C4) forms coupled room (L45, C45) with the 5th resonant cavity (L5, C5); The 6th resonant cavity (L6, C6) forms coupled room (L67, C67) with the 7th resonant cavity (L7, C7); The 7th resonant cavity (L7, C7) forms coupled room (L78, C78) with the 8th resonant cavity (L8, C8); The 8th resonant cavity (L8, C8) forms coupled room (L89, C89) with the 9th resonant cavity (L9, C9); The 9th resonant cavity (L9, C9) forms coupled room (L(9,10), C(9,10 with the tenth resonant cavity (L10, C10))).
In conjunction with Fig. 1, Fig. 2, the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC of the present invention, common first resonant cavity that forms of defective voids C1 between strip line L1 and ground plate 1, strip line L1, by the length of adjusting strip line L1, the resonance frequency that width can be adjusted resonant cavity (L1, C1); Common second resonant cavity that forms of defective voids C2 between strip line L2 and ground plate 2, strip line L2, by the length of adjusting strip line L2, the resonance frequency that width can be adjusted resonant cavity (L2, C2); Common the 3rd resonant cavity that forms of defective voids C3 between strip line L3 and ground plate 3, strip line L3, by the length of adjusting strip line L3, the resonance frequency that width can be adjusted resonant cavity (L3, C3); Common the 4th resonant cavity that forms of defective voids C4 between strip line L4 and ground plate 4, strip line L4, by the length of adjusting strip line L4, the resonance frequency that width can be adjusted resonant cavity (L4, C4); Common the 5th resonant cavity that forms of defective voids C5 between strip line L5 and ground plate 5, strip line L5, by the length of adjusting strip line L5, the resonance frequency that width can be adjusted resonant cavity (L5, C5); Common the 6th resonant cavity that forms of defective voids C6 between strip line L6 and ground plate 5, strip line L6, by the length of adjusting strip line L6, the resonance frequency that width can be adjusted resonant cavity (L6, C6); Common the 7th resonant cavity that forms of defective voids C7 between strip line L7 and ground plate 4, strip line L7, by the length of adjusting strip line L7, the resonance frequency that width can be adjusted resonant cavity (L7, C7); Common the 8th resonant cavity that forms of defective voids C8 between strip line L8 and ground plate 3, strip line L8, by the length of adjusting strip line L8, the resonance frequency that width can be adjusted resonant cavity (L8, C8); Common the 9th resonant cavity that forms of defective voids C9 between strip line L9 and ground plate 2, strip line L9, by the length of adjusting microstrip line L9, the resonance frequency that width can be adjusted resonant cavity (L9, C9); Common first resonant cavity that forms of defective voids C10 between strip line L10 and ground plate 1, strip line L10, by the length of adjusting strip line L10, the resonance frequency that width can be adjusted resonant cavity (L10, C10).
In conjunction with Fig. 1 and Fig. 2, the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC of the present invention, comprise 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) coupling, resonant cavity (L2, C2), resonant cavity (L3, C3) by coupled room (L23, C23) coupling, resonant cavity (L3, C3), resonant cavity (L4, C4) by coupled room (L34, C34) coupling, resonant cavity (L4, C4), resonant cavity (L5, C5) by coupled room (L45, C45) coupling, resonant cavity (L6, C1), resonant cavity (L7, C7) by coupled room (L67, C67) coupling, resonant cavity (L7, C7), resonant cavity (L8, C8) by coupled room (L78, C78) coupling, resonant cavity (L8, C8), resonant cavity (L9, C9) by coupled room (L89, C89) coupling, resonant cavity (L9, C9), resonant cavity (L10, C10) by coupled room (L(9, 10), C(9, 10)) coupling.
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) be coupled to resonant cavity (L2, C2), arrive resonant cavity (L2, C2) microwave signal is by coupled room (L23, C23) be coupled to resonant cavity (L3, C3), arrive resonant cavity (L3, C3) microwave signal is by coupled room (L34, C34) be coupled to resonant cavity (L4, C4), arrive resonant cavity (L4, C4) microwave signal is by coupled room (L45, C45) be coupled to resonant cavity (L5, 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) be coupled to resonant cavity (L7, C7), arrive resonant cavity (L7, C7) microwave signal is by coupled room (L78, C78) be coupled to resonant cavity (L8, C8), arrive resonant cavity (L8, C8) microwave signal is by coupled room (L89, C89) be coupled to resonant cavity (L9, C9), arrive resonant cavity (L9, C9) microwave signal is by coupled room (L(9, 10), C(9, 10)) be coupled to resonant cavity (L10, C10).In the situation that keep width constant, can change the resonance frequency of each resonant cavity by the length that changes strip line L1, L2, L3, L4, L5, L6, L7, L8, L9, L10.When the vertical range between five layers of ground plane of maintenance is constant, the size that changes the lap area between neighbouring strip line can be regulated the stiffness of coupling between resonant cavity, for example: the size that changes the lap area between strip line L1, L2 can change the stiffness of coupling between resonant cavity (L1, C1) and resonant cavity (L2, C2).In addition, in the situation that keep the 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 only is 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 that comprises front and rear surfaces, upper and lower ground plate, five layers of ground plate that connects strip line in defect part, input output port with in be connected to ground plate strip line be connected, three metal columns in centre, input port (P1) is that the tap, the output port that with strip line L1, are connected are the taps be connected with strip line L10; Input port (P1) termination input signal, another termination input tape shape line (L1), output port P2 mono-termination output signal, the other end meets strip line L10; Strip line L1 mono-termination ground plate 1, other end open circuit, side meets I/O mouth P1; Strip line L10 mono-termination ground plate 10, other end open circuit, side meets output port P2; Strip line L2 mono-termination ground plate 2, other end open circuit; L9 mono-termination ground plate 2, one end open circuits; Strip line L3 mono-termination ground plate 3, one end open circuits; Strip line L8 mono-termination ground plate 3, one end open circuits; Strip line L4 mono-termination ground plate 4, one end open circuits; Strip line L7 mono-termination ground plate 4, one end open circuits; Strip line L5 mono-termination ground plate 5, one end open circuits; Strip line L6 mono-termination ground plate 5, one end open circuits; The earth terminal position opposite of adjacent strip line; Three metal column upper ends and the ground plate 1 that place in centre position join, and lower end and ground plate 4 join, and ground plate 2, ground plate 3 are passed in centre; Wherein, common first resonant cavity that forms of the defective voids C1 between strip line L1 and ground plate 1, strip line L1; Common second resonant cavity that forms of defective voids C2 between strip line L2 and ground plate 2, strip line L2; Common the 3rd resonant cavity that forms of defective voids C3 between strip line L3 and ground plate 3, strip line L3; Common the 4th resonant cavity that forms of defective voids C4 between strip line L4 and ground plate 4, strip line L4; Common the 5th resonant cavity that forms of defective voids C5 between strip line L5 and ground plate 5, strip line L5; Common the 6th resonant cavity that forms of defective voids C6 between strip line L6 and ground plate 5, strip line L6; Common the 7th resonant cavity that forms of defective voids C7 between strip line L7 and ground plate 4, strip line L7; Common the 8th resonant cavity that forms of defective voids C8 between strip line L8 and ground plate 3, strip line L8; Common the 9th resonant cavity that forms of defective voids C9 between strip line L9 and ground plate 2, strip line L9; Common the tenth resonant cavity that forms of defective voids C10 between strip line L10 and ground plate 1, strip line L10; The first resonant cavity (L1, C1) forms coupled room (L12, C12) with the second resonant cavity (L2, C2); The second resonant cavity (L2, C2) forms coupled room (L23, C23) with the 3rd resonant cavity (L3, C3); The 3rd resonant cavity (L3, C3) forms coupled room (L34, C34) with the 4th resonant cavity (L4, C4); The 4th resonant cavity (L4, C4) forms coupled room (L45, C45) with the 5th resonant cavity (L5, C5); The 6th resonant cavity (L6, C6) forms coupled room (L67, C67) with the 7th resonant cavity (L7, C7); The 7th resonant cavity (L7, C7) forms coupled room (L78, C78) with the 8th resonant cavity (L8, C8); The 8th resonant cavity (L8, C8) forms coupled room (L89, C89) with the 9th resonant cavity (L9, C9); The 9th resonant cavity (L9, C9) forms coupled room (L(9,10), C(9,10 with the tenth resonant cavity (L10, C10))).
2. the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC according to claim 1 is characterized in that: coupled room (L12, C12) by resonant cavity (L1, C1) with resonant cavity (L2, C2) by broadside coupled generation; Coupled room (L23, C23) by resonant cavity (L2, C2) and resonant cavity (L3, C3) by broadside coupled generation; Coupled room (L34, C34) by resonant cavity (L3, C3) and resonant cavity (L4, C4) by broadside coupled generation; Coupled room (L45, C45) by resonant cavity (L4, C4) and resonant cavity (L5, C5) by broadside coupled generation; Coupled room (L67, C67) by resonant cavity (L6, C6) and resonant cavity (L7, C7) by broadside coupled generation; Coupled room (L78, C78) by resonant cavity (L7, C7) and resonant cavity (L8, C8) by broadside coupled generation; Coupled room (L89, C89) by resonant cavity (L8, C8) and resonant cavity (L9, C9) by broadside coupled generation; Coupled room (L(9,10), C(9,10)) by resonant cavity (L9, C9) with resonant cavity (L10, C10) by broadside coupled generation; Resonant cavity (L5, C5) directly is connected by microstrip line L13 and resonant cavity (L6, C6).
3. the broadside coupled band pass filter of Ka wave band millimeter wave of LTCC according to claim 1, it is characterized in that: common first resonant cavity that forms of the defective voids C1 between strip line L1 and ground plate 1, strip line L1, by the length of adjusting strip line L1, can adjust the resonance frequency of resonant cavity (L1, C1); Defective voids C2 between strip line L2 and ground plate 2, strip line L2 form the second resonant cavity jointly, by the length of adjusting strip line L2, can adjust the resonance frequency of resonant cavity (L2, C2); Defective voids C3 between strip line L3 and ground plate 3, strip line L3 form the 3rd resonant cavity jointly, by the length of adjusting strip line L3, can adjust the resonance frequency of resonant cavity (L3, C3); Defective voids C4 between strip line L4 and ground plate 4, strip line L4 form the 4th resonant cavity jointly, by the length of adjusting strip line L4, can adjust the resonance frequency of resonant cavity (L4, C4); Defective voids C5 between strip line L5 and ground plate 5, strip line L5 form the 5th resonant cavity jointly, by the length of adjusting strip line L5, can adjust the resonance frequency of resonant cavity (L5, C5); Defective voids C6 between strip line L6 and ground plate 5, strip line L6 form the 6th resonant cavity jointly, by the length of adjusting strip line L6, can adjust the resonance frequency of resonant cavity (L6, C6); Defective voids C7 between strip line L7 and ground plate 4, strip line L7 form the 7th resonant cavity jointly, by the length of adjusting strip line L7, can adjust the resonance frequency of resonant cavity (L7, C7); Defective voids C8 between strip line L8 and ground plate 3, strip line L8 form the 8th resonant cavity jointly, by the length of adjusting strip line L8, can adjust the resonance frequency of resonant cavity (L8, C8); Defective voids C9 between strip line L9 and ground plate 2, strip line L9 form the 9th resonant cavity jointly, by the length of adjusting microstrip line L9, can adjust the resonance frequency of resonant cavity (L9, C9); Defective voids C10 between strip line L10 and ground plate 1, strip line L10 form the first resonant cavity jointly, by the length of adjusting strip line L10, can adjust the resonance frequency of resonant cavity (L10, C10); Middle three metal columns placing play the effect of the coupling between the resonant cavity of isolation left and right.
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Cited By (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 |
| CN108428974A (en) * | 2017-02-03 | 2018-08-21 | Tdk株式会社 | Bandpass filter |
| CN108461881A (en) * | 2018-03-20 | 2018-08-28 | 中国电子科技集团公司第二十九研究所 | A kind of transmission structure and its manufacturing method of ltcc substrate microwave signal |
| CN110635201A (en) * | 2019-08-26 | 2019-12-31 | 中国电子科技集团公司第十三研究所 | Comb filter |
| CN112164846A (en) * | 2020-09-10 | 2021-01-01 | 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 |
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| YONG-SHENG DAI 等: "Miniaturized LTCC Wideband Bandpass Filter using Lumped-element Shunt LC Resonators", 《IEEE》 * |
| 张祥军等: "小型化多层带线谐振腔缺陷地结构LTCC宽带带通滤波器", 《微波学报》 * |
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Cited By (7)
| 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 |
| CN108428974A (en) * | 2017-02-03 | 2018-08-21 | Tdk株式会社 | Bandpass filter |
| CN108461881A (en) * | 2018-03-20 | 2018-08-28 | 中国电子科技集团公司第二十九研究所 | A kind of transmission structure and its manufacturing method of ltcc substrate microwave signal |
| 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 |
| CN110635201A (en) * | 2019-08-26 | 2019-12-31 | 中国电子科技集团公司第十三研究所 | Comb filter |
| 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 |
| CN112164846A (en) * | 2020-09-10 | 2021-01-01 | 武汉凡谷电子技术股份有限公司 | Millimeter wave band-pass filter |
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Granted publication date: 20150701 Termination date: 20200801 |