CN103490127A - Three-pass-band filter - Google Patents
Three-pass-band filter Download PDFInfo
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- CN103490127A CN103490127A CN201310428908.8A CN201310428908A CN103490127A CN 103490127 A CN103490127 A CN 103490127A CN 201310428908 A CN201310428908 A CN 201310428908A CN 103490127 A CN103490127 A CN 103490127A
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Abstract
The invention discloses a three-pass-band filter which is applied to the field of communication. The three-pass-band filter comprises a medium substrate provided with grounding through holes, a main circuit located on the upper surface of the medium substrate and a metal grounding layer located on the lower surface of the medium substrate. The main circuit is formed by the concatenation of two quarter-wave stepped impedance resonators which are distributed in axial symmetry, the two quarter-wave stepped impedance resonators are connected through the grounding through holes, the two quarter-wave stepped impedance resonators are respectively connected with an input/output feeder line, each quarter-wave stepped impedance resonator comprises three transmission lines connected end to end, and an open circuit transmission line is loaded on the middle section of each transmission line located in the middle. The three-pass-band filter has the advantages that central frequency and bandwidth are easy to control, the selectivity of the frequency is high, separating strength among pass-bands is high, and the size is small.
Description
Technical field
The invention belongs to technical field of micro communication, be specifically related to a kind of compact type three-passband filter of planar microstrip structure.
Background technology
Along with the fast development of multiband, multi-standard wireless communication system, to high selectivity and the higher requirement of miniaturization proposition of multi-band bandpass filter frequency.
Realize the screening of three band signals, traditional method is to adopt three single-pass band filters to realize respectively the screening to each passband signal, the characteristics simple possible of this method, but underintegration, can't meet radio communication small size, light-weighted demand for development.Therefore designing a kind of " high selectivity, miniaturization " three-passband filter that can effective integration is when previous important topic.
The implementation of three-passband filter has a variety of, at present more common structure and corresponding characteristics thereof are as follows: (1) realizes the three-passband filter structure by two groups or three groups of resonator parallel connections, adopt public input/output port, every group of resonator produces a passband or two passbands, and the deficiency of this filter construction is that its complexity, volume are large; (2) realize three-passband filter by introduce transmission zero in single-pass band or double-passband filter, but this filter exist equally baroque problem and design difficulty larger.
Summary of the invention
The object of the invention is to overcome the problems referred to above of the prior art, provide a kind of simple in structure, be convenient to processing and frequency selectivity is good, isolation is high planar microstrip compact type three-passband filter.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of planar microstrip compact type three-passband filter, comprise the dielectric substrate that is provided with grounding through hole, be positioned at the main line and the metal stratum that is positioned at the dielectric substrate lower surface of dielectric substrate upper surface, described main line is formed by two quarter-wave step electric impedance resonator cascades that distribute axisymmetricly, two quarter-wave step electric impedance resonators connect by grounding through hole, connect respectively the I/O feeder line on two quarter-wave step electric impedance resonators, it is characterized in that: each step electric impedance resonator comprises three end to end transmission lines, be loaded with open circuited transmission line on the interlude of the transmission line in the middle of being positioned at.
Further, described open circuited transmission line is helix structure.
Further, be positioned at end in described step electric impedance resonator and the transmission line that is not connected with grounding through hole is helix structure.
Further, described I/O feeder line is the microstrip line that characteristic impedance is 50 ohm.
Further, described I/O feeder line is tap structure.
The beneficial effect of the planar microstrip compact type three-passband filter that compared with prior art, the present invention proposes is as follows:
At first, planar microstrip compact type three-passband filter of the present invention loads respectively open circuited transmission line by two quarter-wave step electric impedance resonators at cascade and realizes, after definite quarter-wave step electric impedance resonator, length and loading position by the controlled loading open-circuit line can control effectively to centre frequency and the bandwidth of passband;
Secondly, in planar microstrip compact type three-passband filter of the present invention, form electromagnetic coupled between the transmission line of two step electric impedance resonators, grounding through hole is to pass through magnetic coupling between two step electric impedance resonators, facts have proved, this structure can produce six transmission zeros near the both sides of filter passband, makes filter have higher frequency selective characteristic and isolation;
Again, planar microstrip compact type three-passband filter of the present invention is planar structure, the circuit structure compactness, be helix structure by the part transmission line design by open circuited transmission line and step electric impedance resonator, further improved space availability ratio, reduced circuit size;
Finally, planar microstrip compact type three-passband filter of the present invention is simple in structure, is easy to processing.
The accompanying drawing explanation
The structural representation that Fig. 1 is planar microstrip compact type three-passband filter of the present invention;
The frequency response curve that Fig. 2 is the planar microstrip compact type three-passband filter in embodiment.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the planar microstrip compact type three-passband filter in the present embodiment comprises the dielectric substrate 1 that is provided with grounding through hole 11, is positioned at the main line of dielectric substrate 1 upper surface and is positioned at the metal stratum 3 of dielectric substrate lower surface.Main line is formed by two quarter-wave step electric impedance resonator 21,21 ＇ cascades that distribute axisymmetricly, and two step electric impedance resonators 21 are connected and are grounded by grounding through hole 11 with 21 ＇.Step electric impedance resonator 21 comprises three end to end transmission lines 211,212 and 213; Step electric impedance resonator 21 ＇ comprise three end to end transmission line 211 ＇, 212 ＇ and 213 ＇, wherein, form electromagnetic coupled between transmission line 212 and 212 ＇ and between 213 and 213 ＇, grounding through hole 11 provides magnetic coupling, can effectively control filter bandwidht by the electromagnetic coupled intensity of adjusting between step electric impedance resonator 21 and 21 ＇, can effectively control the filter band by electric coupling and magnetic coupling ratio in the adjustment electromagnetic coupled simultaneously and transmit zero point outward.Be positioned on the interlude of the transmission line 212 of step electric impedance resonator 21,21 in the middle of ＇ and 212 ＇ and be loaded with open circuited transmission line 4 and 4 ＇, can effectively the higher order resonances mould of quarter-wave step electric impedance resonator 21 or 21 ＇ be moved to the low frequency end by loading open circuited transmission line 4,4.The step electric impedance resonator 21 of two cascades forms the three-passband filter of the present embodiment together with open circuited transmission line 4,4 ＇ with 21 ＇, this three-passband filter can be realized the screening of three different frequency range signals, makes same radio-frequency front-end can support the work of a plurality of communication standards of different frequency.
In order further to improve space availability ratio, to reduce circuit size, and then reduce filter size, open circuited transmission line 4,4 ＇ and transmission line 213,213 ＇ here all adopt helix structure.
Connect respectively I/O feeder line 5,5 ＇ on two quarter-wave step electric impedance resonator 21,21 ＇, I/O feeder line 5,5 ＇ in the present embodiment all adopt tap structure, and are the microstrip line that characteristic impedance is 50 ohm.
Figure 2 shows that the frequency response curve of the planar microstrip compact type three-passband filter in the present embodiment, the curve S in figure
11for the characteristic curve of signal port reflection, curve S
21for the transfer curve of signal, as seen from the figure, the centre frequency of the first passband is 1.92GHz, its three dB bandwidth is 6.4%, meets the requirement of gsm system, and insertion loss is 0.9dB, return loss is greater than 17.5dB, and this passband produces two transmission zero Tz at 1.66GHz and 2.65GHz place
1, Tz
2; The centre frequency of the second passband is 3.50GHz, and its three dB bandwidth is 4.0%, meets the requirement of WIMAX system, and insertion loss is 1.8dB, and return loss is greater than 15.5dB, and this passband produces two transmission zero Tz at 3.07GHz and 3.96GHz place
3, Tz
4; The centre frequency of the 3rd passband is 5.75GHz, and its three dB bandwidth is 2.4%, meets the requirement of WLAN (5.7GHz) system, and insertion loss is 1.9dB, and return loss is greater than 19.5dB, and this passband produces two transmission zero Tz at 5.40GHz and 6.17GHz place
5, Tz
6.Transmission zero Tz
1, Tz
2, Tz
3, Tz
4, Tz
5, Tz
6improved greatly the frequency selectivity of filter, simultaneously transmission zero Tz
2and Tz
3improved the isolation between the first passband and the second passband, transmission zero Tz
4and Tz
5improved the isolation of the second passband and threeway interband.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (5)
1. a three-passband filter, comprise the dielectric substrate that is provided with grounding through hole, be positioned at the main line and the metal stratum that is positioned at the dielectric substrate lower surface of dielectric substrate upper surface, described main line is formed by two quarter-wave step electric impedance resonator cascades that distribute axisymmetricly, two quarter-wave step electric impedance resonators connect by grounding through hole, connect respectively the I/O feeder line on two quarter-wave step electric impedance resonators, it is characterized in that: each step electric impedance resonator comprises three end to end transmission lines, be loaded with open circuited transmission line on the interlude of the transmission line in the middle of being positioned at.
2. three-passband filter according to claim 1, it is characterized in that: described open circuited transmission line is helical structure.
3. three-passband filter according to claim 1 is characterized in that: be positioned at end in described step electric impedance resonator and the transmission line that is not connected with grounding through hole is helical structure.
4. three-passband filter according to claim 1, it is characterized in that: described I/O feeder line is the microstrip line that characteristic impedance is 50 ohm.
5. according to the described three-passband filter of claim 1 or 4, it is characterized in that: described I/O feeder line is tap structure.
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| CN201310428908.8A CN103490127B (en) | 2013-09-18 | 2013-09-18 | Three-passband filter |
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| CN201310428908.8A CN103490127B (en) | 2013-09-18 | 2013-09-18 | Three-passband filter |
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| CN103490127B CN103490127B (en) | 2015-08-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317589A (en) * | 2017-06-16 | 2017-11-03 | 京信通信系统（中国）有限公司 | Micro-strip combiner and its radio circuit |
| CN114639930A (en) * | 2022-02-25 | 2022-06-17 | 中国电子科技集团公司第十研究所 | Dual-passband filter with isolated high passband |
Citations (3)
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|---|---|---|---|---|
| CN1529923A (en) * | 2001-06-13 | 2004-09-15 | Resonator and filter comprising same | |
| US20090243760A1 (en) * | 2008-03-25 | 2009-10-01 | Min-Shun Hsu | Second-Order Band-Pass Filter and Wireless Apparatus Using the Same |
| CN102509823A (en) * | 2011-10-26 | 2012-06-20 | 京信通信系统（中国）有限公司 | Double-passband micro-strip filter |
-
2013
- 2013-09-18 CN CN201310428908.8A patent/CN103490127B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529923A (en) * | 2001-06-13 | 2004-09-15 | Resonator and filter comprising same | |
| US20090243760A1 (en) * | 2008-03-25 | 2009-10-01 | Min-Shun Hsu | Second-Order Band-Pass Filter and Wireless Apparatus Using the Same |
| CN102509823A (en) * | 2011-10-26 | 2012-06-20 | 京信通信系统（中国）有限公司 | Double-passband micro-strip filter |
Non-Patent Citations (7)
| Title |
|---|
| CHIH-MING TSAI等: "Transmission-Line Filters With Capacitively Loaded Coupled Lines", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》, vol. 51, no. 5, 29 April 2003 (2003-04-29) * |
| CHING-HER LEE等: "Design of a New Tri-Band Microstrip BPF Using Combined Quarter-Wavelength SIRs", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》, vol. 16, no. 11, 30 October 2006 (2006-10-30) * |
| FEI CHENG等: "A Wide-Stopped Microstrip Bandpass Filter Using Mixed Electric and Magnetic Coupled Resonators", 《CROSS STRAIT QUAD-REGIONAL RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE (CSQRWC), 2013 》, 25 July 2013 (2013-07-25) * |
| M.T. DOAN等: "Tri-band bandpass filter using square ring short stub loaded resonators", 《ELECTRONICS LETTERS》, vol. 48, no. 2, 19 January 2012 (2012-01-19), pages 1 - 2 * |
| WEI-YU CHEN等: "A New Tri-Band Bandpass Filter Based on Stub-Loaded Step-Impedance Resonator", 《MICROWAVE AND WIRELESS COMPONENTS LETTERS, IEEE》, 19 March 2012 (2012-03-19) * |
| X.LUO等: "Dual-band bandpass filter using embedded spiral resonator and broadside-coupled meander slot-line", 《ELECTRONICS LETTERS》, vol. 46, no. 6, 5 August 2010 (2010-08-05) * |
| XIAO OUYANG等: "Compact Quasi-Elliptic Filter Using Mixed EM Coupling /4 Stepped-Impedance Resonators", 《MICROWAVE AND MILLMETER WAVE TECHNOLOGY(ICMMT)》, vol. 4, 8 May 2012 (2012-05-08), XP032452111, DOI: doi:10.1109/ICMMT.2012.6230258 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317589A (en) * | 2017-06-16 | 2017-11-03 | 京信通信系统（中国）有限公司 | Micro-strip combiner and its radio circuit |
| CN114639930A (en) * | 2022-02-25 | 2022-06-17 | 中国电子科技集团公司第十研究所 | Dual-passband filter with isolated high passband |
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| CN103490127B (en) | 2015-08-26 |
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