CN103794838A - LTCC-based S-waveband high-performance micro band-pass balanced filter - Google Patents
LTCC-based S-waveband high-performance micro band-pass balanced filter Download PDFInfo
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- CN103794838A CN103794838A CN201310332307.7A CN201310332307A CN103794838A CN 103794838 A CN103794838 A CN 103794838A CN 201310332307 A CN201310332307 A CN 201310332307A CN 103794838 A CN103794838 A CN 103794838A
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Abstract
The invention relates to a low temperature co-fired ceramic (LTCC)-based S-waveband high-performance micro band-pass balanced filter comprising a 50-ohm impedance input interface being suitable for surface mounting, two 75-ohm impedance output interface being suitable for surface mounting, a matching stage containing strip lines and two built-in resistors, four parallel resonance stages realized by using strip lines, an input inductor and output inductors. The above-mentioned structure is realized based on the three-dimensional packaging integrated design by using the multi-layer LTCC process, so that the size is obviously reduced; and the frequency band is an S waveband. The provided filter with the technology has advantages of wide covered frequency band, small insertion loss value, low input-output standing-wave ration and low cost, high reliability and temperature stability, and good electric performance batch consistency and the like and is suitable for batch production. The filter is especially suitable for wireless communication hand-held and portable terminal products with all-frequency band radar, antenna, communication rocket-borne, onboard, missile-borne, and individual mobile communication interruption and the like and has the extensive application prospects in the high-speed data wireless communication in the future.
Description
Technical field
The invention belongs to microwave and millimeter wave technical field, relate to a kind of logical balance filter of the miniature band of hybrid LTCC that is applied to microwave and millimeter wave circuit, relate in particular to the logical balance filter of a kind of S-band high-performance micro band based on LTCC.
Background technology
Along with developing rapidly of wireless communication technology, system is also more and more higher for the requirement of circuit miniaturization, in order further to reduce the size of filter and the performance of raising filter, development in recent years a kind of LTCC(LTCC of getting up) technology, effectively solve conventional filter design and be difficult to meet miniaturization and this problem of high performance requirements.LTCC (LTCC) technology adopts sandwich construction, and passive device is embedded in ceramic material, obtains required modular assembly.LTCC technology all shows many merits at aspects such as cost, integration packaging, wiring live width and distance between centers of tracks, Low ESR metallization, design diversity and flexibility and high frequency performances, has become the mainstream technology of passive integration.
Balance filter is mainly used in the unlimited radio-frequency front-ends that receive product such as bluetooth earphone, 802.11b/g/n wireless local area module, Wi-Fi, GPS, FM broadcast, provide important function to comprise antenna (receiving and radiated electromagnetic wave), filter (band connection frequency is selected and suppressed interference), balancer (impedance and signal conversion) etc., balance filter can suppress the noise of ambient noise and the generation of inner active device efficiently, thereby there is superior electromagnetic compatibility characteristic, along with the develop rapidly of integrated circuit, can be more urgent to the demand of balancing device.
For balance filter, research obtains certain achievement both at home and abroad at present, guaranteeing due filtering characteristic, can effectively suppress common-mode noise simultaneously.Most of balance filters are by one but port filter and two barron structures are realized, but shortcoming is that area is huge, and three port match effects are poor.
Summary of the invention
The object of the present invention is to provide pass-band loss compared with low, simple in structure, volume is little, cost is low, use the logical balance filter of the S-band high-performance micro band based on LTCC comparatively easily.
The technical scheme that realizes the object of the invention is: a kind of S-band high-performance micro band based on LTCC leads to balance filter, comprise the 50 ohmage input ports that install on surface, input inductance, the first strip line, the second strip line, the 3rd strip line, the 4th strip line, the 5th strip line, the 6th strip line, the 7th strip line, the 8th strip line, the 9th strip line, the tenth strip line, the 11 strip line, the 12 strip line, Z-type interstage coupling strip line 1, Z-type interstage coupling strip line 2, resonance coupling connects strip line 1, resonance coupling connects strip line 2, plated-through hole 1, plated-through hole 2, plated-through hole 3, plated-through hole 4, plated-through hole 5, plated-through hole 6, built-in resistor 1, built-in resistor 2, the first outputting inductance, the second outputting inductance, coupling strip line, the first output port, the second output port.
Compared with prior art, its remarkable advantage is in the present invention: (1) is simple in structure; (2) volume size is little, reliability is strong; (3) device electrical performance is good, and insertion loss is little; (4) in technique, be easy to realize, relatively with common waveguide balance filter, owing to adopting LTCC technology that processing and manufacturing difficulty of the present invention is reduced greatly; (5) production cost reduces; (6) have matching stage, make the general balance filter of this balance filter Performance Ratio superior a lot.
Accompanying drawing explanation
Fig. 1 is the structure chart that the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC.
Fig. 2 is the structure vertical view that the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC.
Fig. 3 is the structure side view that the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC.
Fig. 4 is the amplitude-versus-frequency curve that the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC.
Fig. 5 is the phase characteristic curve that the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC.
embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail.
In conjunction with Fig. 1, Fig. 2, Fig. 3, the S-band high-performance micro band that the present invention is based on LTCC leads to balance filter, comprises the 50 ohmage input port P1 that install on surface, input inductance L in, the first strip line T1, the second strip line T2, the 3rd strip line T3, the 4th strip line T4, the 5th strip line T5, the 6th strip line T6, the 7th strip line T7, the 8th strip line T8, the 9th strip line T9, the tenth strip line T10, the 11 strip line T11, the 12 strip line T12, Z-type interstage coupling strip line 1(O1), Z-type interstage coupling strip line 2(O2), resonance coupling connects strip line 1(L1), resonance coupling connects strip line 2(L2), plated-through hole 1(V1), plated-through hole 2(V2), plated-through hole 3(V3), plated-through hole 4(V4), plated-through hole 5(V5), plated-through hole 6(V6), built-in resistor 1(R1), built-in resistor 2(R2), the first outputting inductance Lout1, the second outputting inductance Lout2, coupling strip line Tlin, the first output port P2, the second output port P3.
In conjunction with Fig. 1, Fig. 2, Fig. 3, the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC, comprise that the first strip line T1, the second strip line T2 and the 3rd strip line T3 form parallel resonance level 1; The 4th strip line T4, the 5th strip line T5 and the 6th strip line T6 form parallel resonance level 2; The 7th strip line T7, the 8th strip line T8 and the 9th strip line T9 form parallel resonance level 3; The tenth strip line T10, the 11 strip line T11 and the 12 strip line T12 form parallel resonance level 4.Resonance coupling connects strip line 1(L1), resonance coupling connects strip line 2(L2), plated-through hole 1(V1), plated-through hole 2(V2), plated-through hole 3(V3), plated-through hole 4(V4), plated-through hole 5(V5), plated-through hole 6(V6), built-in resistor 1(R1), built-in resistor 2(R2), coupling strip line (Tlin) formed match circuit.In parallel resonance level 1, the first strip line T1, the second strip line T2 and the 3rd strip line T3 are one end ground connection, make a terminal shortcircuit, and wherein the earth terminal of the first strip line T1 and the 3rd strip line T3 is contrary with the earth terminal of the second strip line T2; In parallel resonance level 2, the 4th strip line T4, the 5th strip line T5 and the 6th strip line T6 are one end ground connection, make a terminal shortcircuit, and wherein the earth terminal of the 4th strip line T4 and the 6th strip line T6 is contrary with the earth terminal of the 5th strip line T5; In parallel resonance level 3, the 7th strip line T7, the 8th strip line T8 and the 9th strip line T9 are one end ground connection, make a terminal shortcircuit, and wherein the earth terminal of the 7th strip line T7 and the 9th strip line T9 is contrary with the earth terminal of the 8th strip line T8; In parallel resonance level 4, the tenth strip line T10, the 11 strip line T11 and the 12 strip line T12 are one end ground connection, make a terminal shortcircuit, and wherein the earth terminal of the tenth strip line T10 and the 12 strip line T12 is contrary with the earth terminal of the 11 strip line T11; The earth terminal of the first strip line T1, the 3rd strip line T3, the 4th strip line T4, the 6th strip line T6, the 7th strip line T7, the 8th strip line T8, the tenth strip line T10, the 12 strip line T12 is same earth terminal, and the earth terminal of the second strip line T2, the 5th strip line T5, the 8th strip line T8, the 11 strip line T11 is same earth terminal.Z-type interstage coupling strip line 1(O1) and Z-type interstage coupling strip line 2(O2) be respectively ground connection of two ends.
In conjunction with Fig. 1, Fig. 2, Fig. 3, the present invention is based on the logical balance filter of S-band high-performance micro band of LTCC, comprise plated-through hole 1(V1) two ends are connected strip line 1(L1 with resonance coupling respectively) be connected with the first outputting inductance (Lout1); Plated-through hole 2(V2) two ends respectively with coupling strip line (Tlin) be connected with the first outputting inductance (Lout1); Plated-through hole 3(V3) two ends all with coupling strip line (Tlin) be connected, play connection function; Plated-through hole 4(V4) two ends, two ends all with coupling strip line (Tlin) be connected, play connection function; Plated-through hole 5(V5) two ends respectively with coupling strip line (Tlin) be connected with the second outputting inductance (Lout2); Plated-through hole 6(V6) two ends are connected respectively strip line 2(L2 with resonance coupling) be connected with the second outputting inductance (Lout2).
The operation principle of the logical balance filter of S-band high-performance micro band that the present invention is based on LTCC is as follows: the broadband microwave signal of input arrives the first parallel resonance level through input port P1 by input inductance L in, in described broadband microwave signal, near microwave signal the first parallel resonance level resonance enters in the first parallel resonance level T1, T2, T3, a near microwave signal part all the other non-first parallel resonance level resonance is by T1, T2, T3 ground connection, realize first order filtering, another part, by the mode of coupling, enters the second parallel resonance level.Near microwave signal the second parallel resonance level enters in the second parallel resonance level T4, T5, T6, a near microwave signal part all the other non-second parallel resonance levels is by T4, T5, T6 ground connection, realize second level filtering, another part, by the mode of coupling, enters the 3rd parallel resonance level.Near microwave signal the 3rd parallel resonance level enters in the 3rd parallel resonance level T7, T8, T9, a near microwave signal part all the other non-the 3rd parallel resonance levels is by T7, T8, T9 ground connection, realize the 3rd utmost point filtering, another part, by the mode of coupling, enters the 4th parallel resonance level.Near microwave signal the 4th parallel resonance level enters in the 4th parallel resonance level T10, T11, T12, a near microwave signal part all the other non-the 4th parallel resonance levels is by T10, T11, T12 ground connection, realize the 4th utmost point filtering, another part is mated and is connected strip line 1(L1 by resonance respectively) be connected strip line 2(L2 with resonance coupling) microwave signal is input in match circuit.
In conjunction with Fig. 1, Fig. 2, Fig. 3, the present invention is based in the match circuit of the logical balance filter of S-band high-performance micro band of LTCC, by built-in resistor 1(R1), built-in resistor 2(R2), coupling strip line (Tlin) formed match circuit, by regulating built-in resistor 1(R1) and the size of built-in resistor 2 (R2), can effectively improve the performance of balance filter, standing-wave ratio is reduced, realize the impedance matching of three ports.This technology goes for various frequencies.Complete after coupling, microwave signal arrives output port P2 and output port P3 by outputting inductance 1 (Lout1) and outputting inductance 2 (Lout2) respectively again.
The size that the present invention is based on the high restraining band pass filter of E wave band of LTCC is only 4.2mm × 2.5mm × 1.5mm.Its performance can find out from Fig. 4 and Fig. 5, and pass band width is 3.8GHz ~ 4.2GHz, and in band, minimum insertion loss is 5.9dB, and return loss is better than 14dB.In passband, phase difference is greater than 175 °, can be good at the requirement of balance output.
Claims (4)
1. the logical balance filter of the S-band high-performance micro band based on LTCC, is characterized in that: comprise the 50 ohmage input ports (P1) that install on surface, input inductance (Lin), the first strip line (T1), the second strip line (T2), the 3rd strip line (T3), the 4th strip line (T4), the 5th strip line (T5), the 6th strip line (T6), the 7th strip line (T7), the 8th strip line (T8), the 9th strip line (T9), the tenth strip line (T10), the 11 strip line (T11), the 12 strip line (T12), Z-type interstage coupling strip line 1(O1), Z-type interstage coupling strip line 2(O2), resonance coupling connects strip line 1(L1), resonance coupling connects strip line 2(L2), plated-through hole 1(V1), plated-through hole 2(V2), plated-through hole 3(V3), plated-through hole 4(V4), plated-through hole 5(V5), plated-through hole 6(V6), built-in resistor 1(R1), built-in resistor 2(R2), the first outputting inductance (Lout1), the second outputting inductance (Lout2), coupling strip line (Tlin), the first output port (P2), the second output port (P3).
2. the logical balance filter of the S-band high-performance micro band based on LTCC according to claim 1, is characterized in that: the first strip line (T1), the second strip line (T2) and the 3rd strip line (T3) form parallel resonance level 1; The 4th strip line (T4), the 5th strip line (T5) and the 6th strip line (T6) form parallel resonance level 2; The 7th strip line (T7), the 8th strip line (T8) and the 9th strip line (T9) form parallel resonance level 3; The tenth strip line (T10), the 11 strip line (T11) and the 12 strip line (T12) form parallel resonance level 4; Resonance coupling connects strip line 1(L1), resonance coupling connects strip line 2(L2), plated-through hole 1(V1), plated-through hole 2(V2), plated-through hole 3(V3), plated-through hole 4(V4), plated-through hole 5(V5), plated-through hole 6(V6), built-in resistor 1(R1), built-in resistor 2(R2), coupling strip line (Tlin) formed match circuit.
3. the logical balance filter of the S-band high-performance micro band based on LTCC according to claim 1, it is characterized in that: in parallel resonance level 1, the first strip line (T1), the second strip line (T2) and the 3rd strip line (T3) are one end ground connection, make a terminal shortcircuit, wherein the earth terminal of the first strip line (T1) and the 3rd strip line (T3) is contrary with the earth terminal of the second strip line (T2); In parallel resonance level 2, the 4th strip line (T4), the 5th strip line (T5) and the 6th strip line (T6) are one end ground connection, make a terminal shortcircuit, wherein the earth terminal of the 4th strip line (T4) and the 6th strip line (T6) is contrary with the earth terminal of the 5th strip line (T5); In parallel resonance level 3, the 7th strip line (T7), the 8th strip line (T8) and the 9th strip line (T9) are one end ground connection, make a terminal shortcircuit, wherein the earth terminal of the 7th strip line (T7) and the 9th strip line (T9) is contrary with the earth terminal of the 8th strip line (T8); In parallel resonance level 4, the tenth strip line (T10), the 11 strip line (T11) and the 12 strip line (T12) are one end ground connection, make a terminal shortcircuit, wherein the earth terminal of the tenth strip line (T10) and the 12 strip line (T12) is contrary with the earth terminal of the 11 strip line (T11); The earth terminal of the first strip line (T1), the 3rd strip line (T3), the 4th strip line (T4), the 6th strip line (T6), the 7th strip line (T7), the 8th strip line (T8), the tenth strip line (T10), the 12 strip line (T12) is same earth terminal, and the earth terminal of the second strip line (T2), the 5th strip line (T5), the 8th strip line (T8), the 11 strip line (T11) is same earth terminal; Z-type interstage coupling strip line 1(O1) and Z-type interstage coupling strip line 2(O2) be respectively ground connection of two ends.
4. the logical balance filter of the S-band high-performance micro band based on LTCC according to claim 1, is characterized in that: plated-through hole 1(V1) two ends are connected strip line 1(L1 with resonance coupling respectively) be connected with the first outputting inductance (Lout1); Plated-through hole 2(V2) two ends respectively with coupling strip line (Tlin) be connected with the first outputting inductance (Lout1); Plated-through hole 3(V3) two ends all with coupling strip line (Tlin) be connected, play connection function; Plated-through hole 4(V4) two ends all with coupling strip line (Tlin) be connected, play connection function; Plated-through hole 5(V5) two ends respectively with coupling strip line (Tlin) be connected with the second outputting inductance (Lout2); Plated-through hole 6(V6) two ends are connected respectively strip line 2(L2 with resonance coupling) be connected with the second outputting inductance (Lout2).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078729A (en) * | 2014-07-16 | 2014-10-01 | 南京理工大学 | Miniature microwave millimeter wave external load I/Q variable phase inversion orthogonal filter |
| CN104091989A (en) * | 2014-07-16 | 2014-10-08 | 南京理工大学 | Minitype microwave millimeter wave self-load I/Q orthogonal filter |
| CN104332681A (en) * | 2014-09-12 | 2015-02-04 | 南京理工大学 | Novel three-dimensional multilayer single-zero-point dual-mode filter |
| CN105789788A (en) * | 2016-04-19 | 2016-07-20 | 戴永胜 | Novel multi-through hole composite resonance type band pass filter |
| CN107611534A (en) * | 2017-08-22 | 2018-01-19 | 南京理工大学 | A kind of new micro-strip cross-couplings triplexer |
| CN110380163A (en) * | 2019-04-24 | 2019-10-25 | 南京理工大学 | LTCC bimodulus ultra-wide band filter based on defect ground structure |
| CN113271514A (en) * | 2021-05-19 | 2021-08-17 | 猫牙(深圳)信息科技有限公司 | Novel miniaturized bluetooth headset based on LTCC technique |
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| CN102610884A (en) * | 2012-03-22 | 2012-07-25 | 南京理工大学常熟研究院有限公司 | Low temperature co-fired ceramic ultra-wideband micro filter |
| CN102820502A (en) * | 2012-08-07 | 2012-12-12 | 南通大学 | Balanced dual-pass band filter |
| CN103117427A (en) * | 2013-02-05 | 2013-05-22 | 江苏万邦微电子有限公司 | Wideband mini low temperature co-fired ceramic balance filter |
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Patent Citations (4)
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| US7825746B2 (en) * | 2005-06-03 | 2010-11-02 | The Chinese University Of Hong Kong | Integrated balanced-filters |
| CN102610884A (en) * | 2012-03-22 | 2012-07-25 | 南京理工大学常熟研究院有限公司 | Low temperature co-fired ceramic ultra-wideband micro filter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078729A (en) * | 2014-07-16 | 2014-10-01 | 南京理工大学 | Miniature microwave millimeter wave external load I/Q variable phase inversion orthogonal filter |
| CN104091989A (en) * | 2014-07-16 | 2014-10-08 | 南京理工大学 | Minitype microwave millimeter wave self-load I/Q orthogonal filter |
| CN104078729B (en) * | 2014-07-16 | 2016-07-06 | 南京理工大学 | The outer variable paraphase orthogonal filter of load I/Q of miniature microwave and millimeter wave |
| CN104332681A (en) * | 2014-09-12 | 2015-02-04 | 南京理工大学 | Novel three-dimensional multilayer single-zero-point dual-mode filter |
| CN104332681B (en) * | 2014-09-12 | 2017-05-10 | 南京理工大学 | Novel three-dimensional multilayer single-zero-point dual-mode filter |
| CN105789788A (en) * | 2016-04-19 | 2016-07-20 | 戴永胜 | Novel multi-through hole composite resonance type band pass filter |
| CN107611534A (en) * | 2017-08-22 | 2018-01-19 | 南京理工大学 | A kind of new micro-strip cross-couplings triplexer |
| CN110380163A (en) * | 2019-04-24 | 2019-10-25 | 南京理工大学 | LTCC bimodulus ultra-wide band filter based on defect ground structure |
| CN113271514A (en) * | 2021-05-19 | 2021-08-17 | 猫牙(深圳)信息科技有限公司 | Novel miniaturized bluetooth headset based on LTCC technique |
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