CN105337005A - Planar three-mode broadband bandpass filter - Google Patents
Planar three-mode broadband bandpass filter Download PDFInfo
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- CN105337005A CN105337005A CN201510849297.3A CN201510849297A CN105337005A CN 105337005 A CN105337005 A CN 105337005A CN 201510849297 A CN201510849297 A CN 201510849297A CN 105337005 A CN105337005 A CN 105337005A
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Abstract
The invention discloses a planar three-mode broadband bandpass filter. The planar three-mode broadband bandpass filter comprises a bottom-layer metal floor, a middle-layer dielectric substrate and an upper-layer metallic circuit. The planar three-mode broadband bandpass filter is characterized in that the upper-layer metallic circuit comprises a first feed network, a ring three-mode resonator circuit and a second feed network. The ring three-mode resonator circuit comprises a tenth uniform transmission line, an eleventh uniform transmission line, a twelfth uniform transmission line, a thirteenth uniform transmission line, a fourteenth uniform transmission line, a fifteenth uniform transmission line and a sixteenth uniform transmission line, wherein the twelfth uniform transmission line, the thirteenth uniform transmission line, the fourteenth uniform transmission line and the fifteenth uniform transmission line form a rectangular ring, and the sixteenth uniform transmission line is connected with the twelfth uniform transmission line and located on the symmetry plane of a three-mode resonator. Three resonance modes are achieved within a passband frequency range, and the broadband filter has good reflection and transmission properties in the passband and further has high-passband selectivity.
Description
Technical field
The present invention relates to the radio-frequency filter field in radio communication, be specifically related to one and there is upper passband optionally plane three mould broadband band-pass filter.
Background technology
Along with the development of wireless communication technology, between the WLAN (wireless local area network) and home network of miniaturization, carry out the demand that high-speed data shares and transmit more and more important, this makes short-range broadband wireless communications become the important development direction of future wireless system development.Broadband connections is a kind of carrierfree communication, can transmit extremely lower powered signal, have transmission rate high on wider frequency spectrum, and antijamming capability is strong, and power is low, and system configuration simply waits many advantages.
The good characteristics had due to broadband connections and wide application prospect, the parts relevant with broadband connections and system development are developed rapidly, as one of Primary Component in wide-band communication system, broadband filter also obtains domestic and international industrial quarters and academia's extensive concern.Method for designing at present for broadband filter is mainly divided into two large classes: high pass, low pass filter cascade design and design based on multimode resonator.Wherein, by high pass filter and low pass filter cascade are designed broadband filter, after cascade, circuit size is bigger than normal, and the pass band insertion loss brought by cascade also can become large thereupon, is unfavorable for high integrated and low-loss demand in real system.The scholars such as 2005 years of jubilation thunders propose the three mould harmonic technologies based on step electric impedance resonator first and are applied in ultra-wide band filter design, and thereafter, the broadband filter method for designing based on multimode resonator is constantly proposed.A kind of multimode wide-band filter loading square resonant ring based on racemosus joint is disclosed in patent of invention CN103187601A, by loading minor matters control realization three Mould Breadth band resonance characteristics, broadband band-pass filter has good pass band transfer and reflection characteristic, but the selectivity of whole passband is very mild, be applied to easy in actual wide-band communication system and near by frequency signal generation interference; The patent No. is that the patent of invention of CN103855450A proposes a kind of microstrip broadband filter based on four mould toroidal cavity resonators; there are four modes of resonance in filter passband frequency range; loop configuration respectively introduces a transmission zero in the upper and lower both sides of passband; greatly improve the selectivity of passband; but return loss is only better than-8dB in the broadband filter passband realized; cause loss fluctuation in passband comparatively large, be unfavorable for the uniform flat transmission of broadband signal.
Summary of the invention
For solving deficiency of the prior art, the invention provides a kind of plane three mould broadband band-pass filter, solving three mould resonant transmission and filter upper passband selective problems in existing broadband filter implementation.
In order to realize above-mentioned target, the present invention adopts following technical scheme: a kind of plane three mould broadband band-pass filter, comprise underlying metal floor, interlayer substrate and upper strata metallic circuit, it is characterized in that: upper strata metallic circuit comprises the first feeding network, annular three mould resonator circuits and the second feeding network; Described first feeding network is made up of uniform transmission line four, uniform transmission line six and uniform transmission line seven, one end of described uniform transmission line four is connected with external circuit, the other end is connected with uniform transmission line seven with uniform transmission line six, and uniform transmission line six is parallel with uniform transmission line seven;
Described second feeding network is made up of uniform transmission line five, uniform transmission line eight and uniform transmission line nine, one end of uniform transmission line five is connected with external circuit, the other end is connected with uniform transmission line nine with uniform transmission line eight, and transmission line eight is parallel with uniform transmission line nine;
Described annular three mould resonator circuits comprise uniform transmission line ten, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16; Described uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 form straight-flanked ring, and described uniform transmission line 16 is connected with uniform transmission line 12 and is positioned on the plane of symmetry of three mould resonators; Described uniform transmission line ten is connected with one end of uniform transmission line 12, and between uniform transmission line six and uniform transmission line seven; Described uniform transmission line 11 is connected with the other end of uniform transmission line 12, and between uniform transmission line eight and uniform transmission line nine;
Uniform transmission line ten, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 are identical with the length of uniform transmission line 16, and the length of uniform transmission line 12 and uniform transmission line 15 is less than 0.5 times of length of uniform transmission line 16;
Aforesaid a kind of plane three mould broadband band-pass filter, is characterized in that: the plane of symmetry of described three mould resonators is vertical with uniform transmission line 12 and is positioned at the plane in the middle of uniform transmission line 12.
Aforesaid a kind of plane three mould broadband band-pass filter, is characterized in that: described uniform transmission line ten, uniform transmission line six and uniform transmission line seven three are parallel to each other, forms the couple feed network of the first input/output end port together with uniform transmission line four; Described first input/output end port is positioned at the junction of uniform transmission line four and external circuit.
Aforesaid a kind of plane three mould broadband band-pass filter, is characterized in that: described uniform transmission line 11, uniform transmission line eight and uniform transmission line nine three are parallel to each other, plays the couple feed network of formation second input/output end port May Day with uniform transmission line; Described second input/output end port is positioned at the junction of uniform transmission line five and external circuit.
The beneficial effect that the present invention reaches:
1, structure is simple, compact dimensions, and the present invention is made up of couple feed network and three mould resonators, and resonator structure is simple, and circuit size is little;
2, mode of resonance is easy to control, and the present invention adopts minor matters to load three mould resonators and realizes broadband filter design, can have three modes of resonance, have better transmission and reflection characteristic in passband in the passband frequency range of broadband.
3, upper passband selectivity characteristic, annular three mould resonator in the present invention, its annular dual path structure can produce a transmission zero in the downside of passband, the open circuit minor matters that the plane of symmetry loads can introduce a transmission zero in the upside of passband, two passband selectivity greatly improving broadband filter zero point.
4, easy of integration, the broadband filter in the present invention adopts planar circuit structure, easily integrated.
5, low cost, the broadband filter structure designed by this invention is only made up of the additional upper and lower double layer of metal face of single-layer medium plate, therefore can adopt traditional PCB processing technology, board cost and processing cost low.
Accompanying drawing explanation
Fig. 1 is the structural representation of broadband filter of the present invention;
Fig. 2 is the upper-layer micro-strip structure schematic diagram of broadband filter of the present invention;
Fig. 3 is the frequency response curve schematic diagram of three mould resonators when weak coupling encourages of broadband filter embodiment 1 of the present invention;
Fig. 4 is the frequency response curve schematic diagram of the embodiment of the present invention 1 broadband filter.
Fig. 5 is the frequency response curve schematic diagram of three mould resonators when weak coupling encourages of broadband filter embodiment 2 of the present invention;
Fig. 6 is the frequency response curve schematic diagram of the embodiment of the present invention 2 broadband filter.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, plane three mould broadband band-pass filter of the present invention, comprises underlying metal floor 1, interlayer substrate 2 and upper strata metallic circuit 3;
Upper strata metallic circuit 3 comprises the first feeding network, annular three mould resonator circuits and the second feeding network; Described first feeding network is made up of uniform transmission line 44, uniform transmission line 66 and uniform transmission line 77, and one end of uniform transmission line 44 is connected with external circuit, and the other end is connected with uniform transmission line 77 with uniform transmission line 66; Described second feeding network is made up of uniform transmission line 55, uniform transmission line 88 and uniform transmission line 99, and one end of uniform transmission line 55 is connected with external circuit, and the other end is connected with uniform transmission line 99 with uniform transmission line 88; Annular three mould resonator circuits are made up of uniform transmission line 10, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16.
Uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 form straight-flanked ring, and uniform transmission line 16 is connected with uniform transmission line 12 and is positioned on the plane of symmetry of three mould resonators; Uniform transmission line 10 is connected with uniform transmission line 12 one end, and between uniform transmission line 66 and uniform transmission line 77; Described uniform transmission line 11 is connected with the other end of uniform transmission line 12, and between uniform transmission line 88 and uniform transmission line 99.
In such scheme, and the face that be positioned at uniform transmission line ten two 12 in the middle of vertical with uniform transmission line 12 is the plane of symmetry of three mould resonators, is also the plane of symmetry of upper strata metallic circuit.
Uniform transmission line 10 is positioned at the centre of uniform transmission line 66 and uniform transmission line 77, and three is parallel to each other, and forms the couple feed network of the first input/output end port together with uniform transmission line 44; Uniform transmission line 11 is positioned at the centre of uniform transmission line 88 and uniform transmission line 99, and three is parallel to each other, forms the couple feed network of the second input/output end port together with uniform transmission line 55; First input/output end port is positioned at uniform transmission line 44 and external circuit junction, second input/output end port is positioned at uniform transmission line 55 and external circuit junction, the couple feed network of the first input/output end port and the couple feed network of the second input/output end port symmetrical about the plane of symmetry of three mould resonators;
In annular three mould resonator circuit composition structure, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16 looping dual path circuit, this circuit can produce a transmission zero in the downside of passband, the open circuit minor matters that the plane of symmetry of three mould resonators loads can introduce a transmission zero in the upside of passband, greatly improve the passband selectivity of three Mould Breadth band filters two zero points.
Three modes of resonance of annular three mould resonator circuits can pass through uniform transmission line 10, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16 control, wherein, uniform transmission line 10, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 is identical with the length of uniform transmission line 16, the length of uniform transmission line 12 and uniform transmission line 15 is less than 0.5 times of length of uniform transmission line 16, three modes of resonance are made to be evenly distributed in passband design frequency range, can ensure that three designed Mould Breadth band filters have good pass band transfer and reflection characteristic.
The medium substrate that the broadband filter of the present embodiment adopts is RogersRT/duroid4003, and thickness is 0.508mm, and metal covering is Copper Foil, and copper thickness is 0.02mm.
Embodiment one: uniform transmission line ten, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 are identical with the length of uniform transmission line 16, the length of uniform transmission line 12 and uniform transmission line 15 equals 0.1 times of length of uniform transmission line 16;
Fig. 3 is the transmission coefficient responses of three mould resonators under weak coupling excitation, three mode of resonance approaches uniformity distributions, and respectively has a transmission zero on the downside of first pattern He on the upside of the 3rd pattern.
Fig. 4 is the frequency response curve schematic diagram of broadband filter, i.e. transmission coefficient amplitude | S
21| and reflectance magnitude | S
11| frequency response results.The centre frequency of broadband filter design is WLAN5.2GHz, 3dB relative bandwidth is 35%, and in band, return loss is better than-15dB, and insertion loss is minimum is 0.3dB, and have three reflection zeros in passband, whole passband has excellent transmission and reflection characteristic.In addition, respectively there is a transmission zero at 4.0GHz and 6.6GHz place, make three invented Mould Breadth band filters have good passband selectivity.
Embodiment two, uniform transmission line ten, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 are identical with the length of uniform transmission line 16, and the length of uniform transmission line 12 and uniform transmission line 15 equals 0.5 times of length of uniform transmission line 16;
Fig. 5 is the transmission coefficient responses of three mould resonators under weak coupling excitation, three mode of resonance approaches uniformity distributions, and there is a transmission zero on the downside of first pattern, but in this embodiment, zero point on the upside of 3rd pattern buries in oblivion, and this is because circular path two paths of signals under this path superposes the effect causing disappear zero point.
Fig. 6 is the frequency response curve schematic diagram of broadband filter, i.e. transmission coefficient amplitude | S
21| and reflectance magnitude | S
11| frequency response results.The centre frequency of broadband filter design is WLAN5.2GHz, 3dB relative bandwidth is 46%, and in band, return loss is better than-9dB, and insertion loss is minimum is 0.8dB.There is a transmission zero at 3.9GHz place, improve the upper edge selectivity of filter passband.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (4)
1. a plane three mould broadband band-pass filter, comprises underlying metal floor, interlayer substrate and upper strata metallic circuit, it is characterized in that: upper strata metallic circuit comprises the first feeding network, annular three mould resonator circuits and the second feeding network; Described first feeding network is made up of uniform transmission line four, uniform transmission line six and uniform transmission line seven, one end of described uniform transmission line four is connected with external circuit, the other end is connected with uniform transmission line seven with uniform transmission line six, and uniform transmission line six is parallel with uniform transmission line seven;
Described second feeding network is made up of uniform transmission line five, uniform transmission line eight and uniform transmission line nine, one end of uniform transmission line five is connected with external circuit, the other end is connected with uniform transmission line nine with uniform transmission line eight, and transmission line eight is parallel with uniform transmission line nine;
Described annular three mould resonator circuits comprise uniform transmission line ten, uniform transmission line 11, uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 and uniform transmission line 16; Described uniform transmission line 12, uniform transmission line 13, uniform transmission line 14, uniform transmission line 15 form straight-flanked ring, and described uniform transmission line 16 is connected with uniform transmission line 12 and is positioned on the plane of symmetry of three mould resonators; Described uniform transmission line ten is connected with one end of uniform transmission line 12, and between uniform transmission line six and uniform transmission line seven; Described uniform transmission line 11 is connected with the other end of uniform transmission line 12, and between uniform transmission line eight and uniform transmission line nine;
Uniform transmission line ten, uniform transmission line 11, uniform transmission line 13, uniform transmission line 14 are identical with the length of uniform transmission line 16, and the length of uniform transmission line 12 and uniform transmission line 15 is less than 0.5 times of length of uniform transmission line 16.
2. a kind of plane three mould broadband band-pass filter according to claim 1, is characterized in that: the plane of symmetry of described three mould resonators is vertical with uniform transmission line 12 and is positioned at the plane in the middle of uniform transmission line 12.
3. a kind of plane three mould broadband band-pass filter according to claim 1, it is characterized in that: described uniform transmission line ten, uniform transmission line six and uniform transmission line seven three are parallel to each other, form the couple feed network of the first input/output end port together with uniform transmission line four; Described first input/output end port is positioned at the junction of uniform transmission line four and external circuit.
4. a kind of plane three mould broadband band-pass filter according to claim 1, it is characterized in that: described uniform transmission line 11, uniform transmission line eight and uniform transmission line nine three are parallel to each other, play the couple feed network of formation second input/output end port May Day with uniform transmission line; Described second input/output end port is positioned at the junction of uniform transmission line five and external circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510849297.3A CN105337005B (en) | 2015-11-27 | 2015-11-27 | A kind of three mould broadband band-pass filter of plane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510849297.3A CN105337005B (en) | 2015-11-27 | 2015-11-27 | A kind of three mould broadband band-pass filter of plane |
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| Publication Number | Publication Date |
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| CN105337005A true CN105337005A (en) | 2016-02-17 |
| CN105337005B CN105337005B (en) | 2018-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134616A (en) * | 2017-06-22 | 2017-09-05 | 南京信息工程大学 | A kind of mode filter of micro-strip five |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005295316A (en) * | 2004-04-01 | 2005-10-20 | Rikogaku Shinkokai | Ring filter and wide band band pass filter using the same |
| CN203871450U (en) * | 2014-05-20 | 2014-10-08 | 中国科学院微电子研究所 | Ultra wide band band-pass filter having trapped wave point |
| CN205282619U (en) * | 2015-11-27 | 2016-06-01 | 南京信息工程大学 | Three mould broadband band -pass filter on plane |
-
2015
- 2015-11-27 CN CN201510849297.3A patent/CN105337005B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005295316A (en) * | 2004-04-01 | 2005-10-20 | Rikogaku Shinkokai | Ring filter and wide band band pass filter using the same |
| CN203871450U (en) * | 2014-05-20 | 2014-10-08 | 中国科学院微电子研究所 | Ultra wide band band-pass filter having trapped wave point |
| CN205282619U (en) * | 2015-11-27 | 2016-06-01 | 南京信息工程大学 | Three mould broadband band -pass filter on plane |
Non-Patent Citations (1)
| Title |
|---|
| CONG TANG等: ""Wideband Bandpass Filter Using Open Stub Loaded Square Ring"", 《WIRELESS SYMPOSIUM（IWS）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134616A (en) * | 2017-06-22 | 2017-09-05 | 南京信息工程大学 | A kind of mode filter of micro-strip five |
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| CN105337005B (en) | 2018-05-29 |
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Address after: 210019 No. 219 Ningliu Road, Jiangbei New District, Nanjing City, Jiangsu Province Patentee after: NANJING University OF INFORMATION SCIENCE & TECHNOLOGY Address before: The Olympic Avenue in Jianye District of Nanjing city of Jiangsu Province, No. 69 210019 Patentee before: NANJING University OF INFORMATION SCIENCE & TECHNOLOGY |
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Effective date of registration: 20211115 Address after: 225200 Zhanggang Industrial Park, economic development zone, Jiangdu District, Yangzhou City, Jiangsu Province Patentee after: Yangzhou Spack Industrial Co., Ltd Address before: No. 219, ningliu Road, Jiangbei new district, Nanjing, Jiangsu 210019 Patentee before: Nanjing University of Information Engineering |