CN103915666A - Micro-strip double-pass-band filter - Google Patents
Micro-strip double-pass-band filter Download PDFInfo
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- CN103915666A CN103915666A CN201410121216.3A CN201410121216A CN103915666A CN 103915666 A CN103915666 A CN 103915666A CN 201410121216 A CN201410121216 A CN 201410121216A CN 103915666 A CN103915666 A CN 103915666A
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Abstract
The invention discloses a micro-strip double-pass-band filter which is respectively applied to a broad-band system and a narrow-band system. The double-pass-band filter is formed on a dielectric substrate and comprises a first resonator, a second resonator, a third resonator, a fourth resonator, a first feeder line, a second feeder line, a first short circuit branch and a second short circuit branch. A three-order interdigital filter is formed by the first feeder line, the second feeder line, the first resonator, the second resonator and the third resonator and a broad-band pass band is generated. A dual-mode filter is formed by the first feeder line, the second feeder line, the first resonator, the third resonator and the fourth resonator and a narrow-band pass band is generated. Parameters of the two pass bands of the double-pass-band filter can be independently adjusted, the pass bands are high in frequency selectivity and isolation, the circuit structure is simple, and performance is good.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of micro-band double-passband filter.
Background technology
Along with the fast development of Modern wireless communication technology, the communication system that is simultaneously operated in two or more frequency ranges becomes an emphasis direction of current research, and wherein applying more is two pass-bands system.Filter element is as vital composition in communication system, and the research of double-passband filter also receives much concern, and microstrip structure is having very large advantage aspect miniaturization low cost, thereby micro-band double-passband filter in the industry cycle has research widely.
In the method for designing of numerous double-passband filters, there are two kinds to be widely adopted, a kind of is to adopt the single resonator with tunable frequency, as step electric impedance resonator (SIR) etc., the filter obtaining like this can be controlled the centre frequency of its each passband very easily, but its bandwidth is but difficult to independently regulate; Second method resonator combined method, combine according to certain mode by different resonators, make every group of resonator produce a passband, by regulating different resonator parameters to control centre frequency and the passband of its corresponding bandwidth, often complex structure of the filter obtaining like this, size is larger.
In existing technology, the problem such as double-passband filter generally exists passband parameter can not independent regulation, bandwidth is narrower and insertion loss is large.
Summary of the invention
Technical problem to be solved by this invention is the defect for background technology, provide a kind of simple in structure, frequency selectivity good, isolation between passband is higher, the micro-band double-passband filter with broadband passband.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of micro-band double-passband filter, comprises the first resonator, the second resonator, the 3rd resonator, the 4th resonator, the first feeder line, the second feeder line, the first short circuit minor matters and the second short circuit minor matters;
Described the first resonator, the second resonator and the 3rd resonator adopt parallel coupled line structure;
Described the first feeder line, the second feeder line, the first resonator, the second resonator and the 3rd resonator form three rank interdigital filters, produce broadband passband, and wherein the second resonator is positioned in the middle of the first resonator and the 3rd resonator, and terminal short circuit;
Described first feeder line one end is connected with the first resonator, and described second feeder line one end is connected with the 3rd resonator;
Described the first short circuit minor matters, the second short circuit minor matters are carried on the 4th resonator, form dual-mode resonator;
Described the first feeder line, the second feeder line, the first resonator, the 3rd resonator and the 4th resonator form dual mode filter, produce arrowband passband.
As the further prioritization scheme of a kind of micro-band double-passband filter of the present invention, also comprise the 3rd short circuit minor matters, the 4th short circuit minor matters, the 5th resonator and sixth resonator, described the 3rd short circuit minor matters load on the first feeder line, and with the 5th resonator coupling, described the 4th short circuit minor matters load on the second feeder line, and are coupled with sixth resonator.
As the further prioritization scheme of a kind of micro-band double-passband filter of the present invention, the described first to the 3rd resonator dimensions is equal, and length is 1/4th of broadband passband central frequency corresponding wavelength, described the first resonator and the 3rd resonator cross-couplings.
As the further prioritization scheme of a kind of micro-band double-passband filter of the present invention, described first feeder line one end is connected with the first resonator is vertical, described second feeder line one end is with the 3rd resonator is vertical is connected, described the 5th resonator adopts the L-type structure of reversion, and described sixth resonator adopts forward L-type structure.
As the further prioritization scheme of a kind of micro-band double-passband filter of the present invention, the impedance of described the first feeder line and the second feeder line is 50 ohm, and the first feeder line and the close place's formation of the second feeder line source-load coupling structure.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1. the parameter of two passbands can independently be controlled;
2. broadband passband has met the demand of Modern Communication System towards broadband development; Arrowband passband, can make it work in the systems such as wireless lan (wlan) by rational selection;
3. between the frequency selectivity of passband and passband, isolation is high, functional, and simple in structure, is easy to processing.
Accompanying drawing explanation
Fig. 1 is the micro-printed circuit board (PCB) tangent plane schematic diagram with double-passband filter of the present invention;
Fig. 2 is the micro-structural representation that is positioned at medium substrate upper strata with double-passband filter of the present invention;
Fig. 3 is the micro-structural representation with three rank interdigital filters in double-passband filter of the present invention;
Fig. 4 is the micro-structural representation with dual mode filter in double-passband filter of the present invention;
Fig. 5 is the micro-grounding through hole schematic diagram that is positioned at medium substrate lower floor with double-passband filter of the present invention;
Fig. 6 is the micro-scattering parameter simulate and test result with double-passband filter of the present invention;
Fig. 7 is micro-group delay emulation and the test result with double-passband filter of the present invention.
In figure: 1, the first feeder line; 2, the second feeder line; 3, the first resonator; 4, the second resonator; 5, the 3rd resonator; 6, the 4th resonator; 7, the first short circuit minor matters; 8, the second short circuit minor matters; 9, the 3rd short circuit minor matters; 10, the 5th resonator; 11, the 4th short circuit minor matters; 12, sixth resonator; 13, the first grounding through hole; 14, the second grounding through hole; 15, the 3rd grounding through hole; 16, the 4th grounding through hole; 17, the 5th grounding through hole; 18, the 6th grounding through hole; 19, the 7th grounding through hole; S1, medium substrate; S2, upper strata metal; S3, lower metal; P1, input port; P2, output port; S
11, port 2 port one while mating reflection coefficient; S
21, port 2 while mating port one to the forward transmission coefficient of port 2.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The invention discloses a kind of micro-band double-passband filter, comprise the first resonator, the second resonator, the 3rd resonator, the 4th resonator, the first feeder line, the second feeder line, the first short circuit minor matters and the second short circuit minor matters;
Described the first resonator, the second resonator and the 3rd resonator adopt parallel coupled line structure;
Described the first feeder line, the second feeder line, the first resonator, the second resonator and the 3rd resonator form three rank interdigital filters, produce broadband passband, and wherein the second resonator is positioned in the middle of the first resonator and the 3rd resonator, and terminal short circuit;
Described first feeder line one end is connected with the first resonator, and described second feeder line one end is connected with the 3rd resonator;
Described the first short circuit minor matters, the second short circuit minor matters are carried on the 4th resonator, form dual-mode resonator;
Described the first feeder line, the second feeder line, the first resonator, the 3rd resonator and the 4th resonator form dual mode filter, produce arrowband passband.
Micro-band double-passband filter disclosed by the invention can also comprise the 3rd short circuit minor matters, the 4th short circuit minor matters, the 5th resonator and sixth resonator, described the 3rd short circuit minor matters load on the first feeder line, and with the 5th resonator coupling, described the 4th short circuit minor matters load on the second feeder line, and are coupled with sixth resonator.
The described first to the 3rd resonator dimensions is equal, and length is 1/4th of broadband passband central frequency corresponding wavelength, described the first resonator and the 3rd resonator cross-couplings.
Described first feeder line one end is connected with the first resonator is vertical, and described second feeder line one end is with the 3rd resonator is vertical is connected, and described the 5th resonator adopts the L-type structure of reversion, and described sixth resonator adopts forward L-type structure.
The impedance of described the first feeder line and the second feeder line is 50 ohm, and the first feeder line and the close place's formation of the second feeder line source-load coupling structure.
Select centre frequency as 3.2GHz take broadband passband, relative bandwidth is 78% for example, and it is 5.8GHz that arrowband passband is selected centre frequency, and the WLAN frequency range that relative bandwidth is 6% is example explanation.
Fig. 1 is medium substrate of the present invention, and its relative dielectric constant is 2.2, and thickness is 0.508mm, and loss angle tangent is 0.0009.Can certainly select the dielectric-slab of other specifications.Be coated with respectively metal level S2 and lower metal layer S3 in the upper and lower surface of dielectric substrate S1, wherein double-passband filter of the present invention is formed at metal level S2, and lower metal layer S3 is as ground plane.
As shown in Figure 2, of the present inventionly micro-ly comprise the first feeder line 1, the second feeder line 2, the first port P1, the second port P2, the first resonator 3, the second resonator 4, the 3rd resonator 5, the 4th resonator 6, the first short circuit minor matters 7, the second short circuit minor matters 8, the 3rd short circuit minor matters 9, the 5th resonator 10, the 4th short circuit minor matters 11, sixth resonator 12 and be used to form the first to seven grounding through hole 13-19 of short-circuit structure with double-passband filter.The first feeder line 1, the second feeder line 2, the first resonator 3, the second resonator 4 and the 3rd resonator 5 as shown in Figure 3, forms three rank interdigital filters, produces broadband passband; The first to three resonator (3-5) size equates, is the quarter-wave resonance device (QWR) of terminal short circuit, and its length is 1/4th of the first passband central frequency corresponding wavelength; The terminal of the second resonator is connected with the first grounding through hole 13, forms short circuit; Short circuit one end of the first resonator 3 and the 3rd resonator 5 respectively with the first feeder line 1 and the second feeder line 2 mutually near vertical being connected of one end at place, the other end of the first feeder line 1 and the second feeder line 2 is respectively as the input/output end port (P1 and P2) of filter; The centre frequency of the first passband and bandwidth can regulate by length and the spacing of the first to three resonator (3-5).As shown in Figure 5, the first feeder line 1, the second feeder line 2, the first resonator 3, the 3rd resonator 5, the 4th resonator 6, the first short circuit minor matters 7 and the second short circuit minor matters 8, form dual mode filter, produces arrowband passband; The first resonator 3 and the 3rd resonator 5 provide close coupling as high impedance feeder line; The first short circuit minor matters 7 and the second short circuit minor matters 8 load on the 4th resonator 6, form the dual-mode resonator of symmetrical structure, can between two passbands, produce a transmission zero Tz4 according to its parity mode at the cancellation effect of main path; The first short circuit minor matters 7 and the second short circuit minor matters 8 sizes equate, realize short circuit respectively by the second grounding through hole 14 and the 3rd grounding through hole 15; The bandwidth of the second passband can be by the length control of the 4th resonator 6 and the first short circuit minor matters 7, and its bandwidth can be adjusted by the spacing of the first short circuit minor matters 7 and the second short circuit minor matters 8.As shown in Figure 2, the first filter and the second filter have common input/output end port (P1/P2) and feeder line, i.e. the first feeder line 1 and the second feeder line 2; Close place's formation source-load coupling structure of the first feeder line 1 and the second feeder line 2, the upper edge that produces a transmission zero Tz1 and the second passband in the lower edge of the first passband produces a transmission zero Tz7; Between the first resonator 3 and the 3rd resonator 5, there is cross-couplings, produce a transmission zero Tz6 in the upper edge of the second passband.The 3rd short circuit minor matters 9 load on the first feeder line 1, can produce a transmission zero Tz8 at the top edge of the second passband, have deepened stopband; The 5th resonator 10 adopts the L-type structure of reversion, is positioned at the 3rd short circuit minor matters side, and has coupling between the 3rd short circuit minor matters, produces transmission zero Tz3.The 4th short circuit minor matters 11 load on the second feeder line 2, can produce a transmission zero Tz2 in the lower edge of the first passband, improve the frequency selectivity of passband; Sixth resonator 12 adopts the L-type structure of forward, be positioned at the 4th short circuit minor matters 11 sides, and between the 4th short circuit minor matters 11, there is coupling, can between two passbands, produce a transmission zero Tz5, the isolation between frequency selectivity and the passband of raising passband; The 5th resonator 10 and sixth resonator 12 are the quarter-wave resonance device of terminal short circuit, its length be Wei transmission zero Tz3 and Tz5 corresponding wavelength 1/4th.The mutual loading effect of the first filter and the second filter can strengthen source-load coupling, improves the isolation between two passbands.
As shown in Figure 5, the micro-band double-passband filter of the present invention medium substrate lower floor, the first grounding through hole 13 is the short circuit termination of the second resonator 4; The second grounding through hole 14 is the short circuit termination of the first short circuit minor matters 7; The 3rd grounding through hole 15 is the short circuit termination of the second short circuit minor matters 8; The 4th grounding through hole 16 is the short circuit termination of the 3rd short circuit minor matters 9; The 5th grounding through hole 17 is the short circuit termination of the 5th resonator 10; The 6th grounding through hole 18 is the short circuit termination of the 4th short circuit minor matters 11; The 7th grounding through hole 19 is the short circuit termination of sixth resonator 12.
As shown in Figure 6, micro-scattering parameter emulation and the measured result with double-passband filter of the present invention, as can be seen from the figure emulation and measured result coincide well, and have good service behaviour.Broadband passband central frequency is 3.2GHz, and relative bandwidth is 78%; Narrow bandpass mid-band frequency is 5.8GHz, and relative bandwidth is 6%; The multiple transmission zeros that produce make two passbands all have the isolation between very high frequency selectivity and very high passband, and isolation is all greater than 30dB.
As shown in Figure 7, micro-group delay emulation and the test result with double-passband filter of the present invention, for broadband and ultra-wide band filter, group delay is the parameter that characterizes its delay character that signal is caused.As can be seen from the figure,, in the first passband, its group delay has very smooth performance.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make under the premise without departing from the principles of the invention some improvement, and these improve and also should be considered as protection scope of the present invention.
Claims (5)
1. a micro-band double-passband filter, is characterized in that, comprises the first resonator, the second resonator, the 3rd resonator, the 4th resonator, the first feeder line, the second feeder line, the first short circuit minor matters and the second short circuit minor matters;
Described the first resonator, the second resonator and the 3rd resonator adopt parallel coupled line structure;
Described the first feeder line, the second feeder line, the first resonator, the second resonator and the 3rd resonator form three rank interdigital filters, produce broadband passband, and wherein the second resonator is positioned in the middle of the first resonator and the 3rd resonator, and terminal short circuit;
Described first feeder line one end is connected with the first resonator, and described second feeder line one end is connected with the 3rd resonator;
Described the first short circuit minor matters, the second short circuit minor matters are carried on the 4th resonator, form dual-mode resonator;
Described the first feeder line, the second feeder line, the first resonator, the 3rd resonator and the 4th resonator form dual mode filter, produce arrowband passband.
2. micro-band double-passband filter according to claim 1, it is characterized in that, also comprise the 3rd short circuit minor matters, the 4th short circuit minor matters, the 5th resonator and sixth resonator, described the 3rd short circuit minor matters load on the first feeder line, and with the 5th resonator coupling, described the 4th short circuit minor matters load on the second feeder line, and are coupled with sixth resonator.
3. micro-band double-passband filter according to claim 1, is characterized in that, the described first to the 3rd resonator dimensions is equal, and length is 1/4th of broadband passband central frequency corresponding wavelength, described the first resonator and the 3rd resonator cross-couplings.
4. micro-band double-passband filter according to claim 2, it is characterized in that, described first feeder line one end is connected with the first resonator is vertical, described second feeder line one end is with the 3rd resonator is vertical is connected, described the 5th resonator adopts the L-type structure of reversion, and described sixth resonator adopts forward L-type structure.
5. micro-band double-passband filter according to claim 1, is characterized in that, the impedance of described the first feeder line and the second feeder line is 50 ohm, and the first feeder line and the close place's formation of the second feeder line source-load coupling structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410121216.3A CN103915666A (en) | 2014-03-28 | 2014-03-28 | Micro-strip double-pass-band filter |
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| CN201410121216.3A CN103915666A (en) | 2014-03-28 | 2014-03-28 | Micro-strip double-pass-band filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201450A (en) * | 2014-07-04 | 2014-12-10 | 电子科技大学 | Micro-strip ultra wideband band-pass filter having wave trapping characteristic |
| CN104466319A (en) * | 2014-12-15 | 2015-03-25 | 中国科学院微电子研究所 | Dual-mode filter with hairpin-like step impedance resonator loaded open-circuit lines |
| WO2016077952A1 (en) * | 2014-11-17 | 2016-05-26 | 华为技术有限公司 | Optical line terminal, optical network unit, and passive optical network system |
| CN106129557A (en) * | 2016-08-31 | 2016-11-16 | 中国电子科技集团公司第三十六研究所 | A kind of cross-coupling band pass filter |
| CN108336458A (en) * | 2018-02-12 | 2018-07-27 | 香港凡谷發展有限公司 | A kind of multimodal fusion dielectric structure applied in filter |
| US11228077B2 (en) | 2019-06-17 | 2022-01-18 | Carrier Corporation | Microstrip DC block |
| 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 |
| CN114824701A (en) * | 2022-04-20 | 2022-07-29 | 中国电子科技集团公司第三十六研究所 | Double-frequency filter |
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| 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 |
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| CN203760606U (en) * | 2014-03-28 | 2014-08-06 | 南京航空航天大学 | Microstrip dual-passband filter |
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| CN102361112A (en) * | 2011-10-21 | 2012-02-22 | 南京航空航天大学 | Dual-band microwave filter |
| 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 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201450A (en) * | 2014-07-04 | 2014-12-10 | 电子科技大学 | Micro-strip ultra wideband band-pass filter having wave trapping characteristic |
| WO2016077952A1 (en) * | 2014-11-17 | 2016-05-26 | 华为技术有限公司 | Optical line terminal, optical network unit, and passive optical network system |
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| CN106165327B (en) * | 2014-11-17 | 2018-07-13 | 华为技术有限公司 | A kind of optical line terminal, optical network unit and passive optical network |
| CN104466319A (en) * | 2014-12-15 | 2015-03-25 | 中国科学院微电子研究所 | Dual-mode filter with hairpin-like step impedance resonator loaded open-circuit lines |
| CN106129557A (en) * | 2016-08-31 | 2016-11-16 | 中国电子科技集团公司第三十六研究所 | A kind of cross-coupling band pass filter |
| CN106129557B (en) * | 2016-08-31 | 2019-02-22 | 中国电子科技集团公司第三十六研究所 | A kind of cross-coupling band pass filter |
| CN108336458A (en) * | 2018-02-12 | 2018-07-27 | 香港凡谷發展有限公司 | A kind of multimodal fusion dielectric structure applied in filter |
| US11228077B2 (en) | 2019-06-17 | 2022-01-18 | Carrier Corporation | Microstrip DC block |
| 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 |
| CN114824701A (en) * | 2022-04-20 | 2022-07-29 | 中国电子科技集团公司第三十六研究所 | Double-frequency filter |
| CN114824701B (en) * | 2022-04-20 | 2024-01-19 | 中国电子科技集团公司第三十六研究所 | Dual-frequency filter |
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Application publication date: 20140709 |