CN201576729U - Interdigital microwave dual-band band-pass filter based on microstrip line structure - Google Patents
Interdigital microwave dual-band band-pass filter based on microstrip line structure Download PDFInfo
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- CN201576729U CN201576729U CN2010201013735U CN201020101373U CN201576729U CN 201576729 U CN201576729 U CN 201576729U CN 2010201013735 U CN2010201013735 U CN 2010201013735U CN 201020101373 U CN201020101373 U CN 201020101373U CN 201576729 U CN201576729 U CN 201576729U
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Abstract
The utility model discloses an interdigital microwave dual-band band-pass filter based on a microstrip line structure, which comprises a signal input terminal, a signal output terminal, a first uniform transmission line unit, a first interdigital coupling structure, a second interdigital coupling structure, a first interdigital capacitor unit, a first stub line unit, a second interdigital capacitor unit, a first compensated transmission line unit, a second compensated transmission line unit, a second uniform transmission line unit and a substrate, wherein the first uniform transmission line unit, the first interdigital coupling structure, the second interdigital coupling structure, the compensated transmission line units and the second uniform transmission line unit are arranged on the substrate. The signal input terminal is connected with the first interdigital capacitor unit through the first uniform transmission line unit; and the signal output terminal is connected with the second interdigital capacitor unit through the second uniform transmission line unit. The utility model has the advantages of high selectiveness for frequency, dual bands, simple structure, small size, small volume, light weight, material conservation, convenient manufacture, easy integration and the like.
Description
Technical field
The utility model relates to filter, relates in particular to a kind of interdigitated microwave double frequency band-pass filter based on microstrip line construction.
Background technology
Microwave filter plays a part in radio communication and signal processing and is important, and it has signal that filters frequency of utilization and the function that suppresses interference signal.Along with radio communication to the more development of high band, be operated in the effect that the microwave filter of high band seems more and more important in communication system, well behaved filter has extremely low insertion loss, excellent frequency selective characteristic, can make full use of frequency resource, the expanding system capacity, well the inhibition zone external signal interference, improve communication quality.Band pass filter is that the signal in the frequency band of being determined by upper side frequency and lower side frequency is passed through, and the critical function device that the signal beyond the frequency band is suppressed.Transmitting and receiving quality of signals is mainly determined by the characteristic of filter.Generally speaking, microwave filter must possess certain bandwidth and higher filter quality.
The normal form that adopts of microstrip bandpass filter has parallel coupled line type, dressing line style, interdigitated etc.Multi-form filter exists defective separately.For example parallel coupled line type microwave filter is because each parallel coupling saves cascade in one direction, so size is bigger.Dressing line style microwave filter need pass through hole ground connection, will introduce error like this under high frequency situations.Interdigitated microwave filter is only considered the coupled relation between adjacent two microstrip lines and has been ignored that all are little with the coupling between the humorous front, is a kind of approximate design of simplifying, and the properties of product of designing like this are relatively poor.In order effectively to utilize limited frequency spectrum resources, improve communication quality, development miniaturization, lightweight, high performance microwave filter become a urgent task.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of interdigitated microwave double frequency band-pass filter based on microstrip line construction is provided.
Interdigitated microwave double frequency band-pass filter based on microstrip line construction comprises signal input part, signal output part, the first uniform transmission line unit, the first interdigitated coupled structure, the second interdigitated coupled structure, the first interdigital capacitor unit, the first stub unit, the second interdigital capacitor unit, the first compensation transmission line unit, the second uniform transmission line unit, matrix and the second compensation transmission line unit; Be provided with the first uniform transmission line unit on the matrix successively, the first interdigitated coupled structure, compensation transmission line unit, the second interdigitated coupled structure, the second uniform transmission line unit, the first interdigitated coupled structure or the second interdigitated coupled structure include the first interdigital capacitor unit, the first stub unit, the second interdigital capacitor unit, the second compensation transmission line unit, the two ends of the first stub unit connect two second compensation transmission line unit, both sides are respectively equipped with the first interdigital capacitor unit and the second interdigital capacitor unit in the middle of the first stub unit, signal input part is connected with the first interdigital capacitor unit of the first interdigitated coupled structure by the first uniform transmission line unit, and signal output part is connected with the second interdigital capacitor unit of the second interdigitated coupled structure by the second uniform transmission line unit.
The ratio that the described first interdigital capacitor unit and the second interdigital capacitor unit refer to is 1: 1, and the spacing that refers to is 0.1～0.4mm.The described first uniform transmission line unit and the second uniform transmission line unit all are the transmission lines of 50 Ω.Described signal input part outer signal source, the pumping signal that adds is by the first uniform transmission line unit, the first interdigitated coupled structure, the first compensation transmission line unit, the second interdigitated coupled structure and the second uniform transmission line unit,, realize signal is carried out filtering after signal output part arrives external circuit.Described matrix is the low-k material.
The utlity model has frequency high selectivity, double frequency-band, simple in structure, size is little, volume is little, in light weight, economical with materials, be convenient to make and be easy to advantages such as integrated.
Description of drawings
Fig. 1 is based on the interdigitated microwave double frequency band-pass filter structural representation of microstrip line construction;
Fig. 2 is based on the interdigitated microwave double frequency band-pass filter performance curve of microstrip line construction.
Embodiment
As shown in Figure 1, interdigitated microwave double frequency band-pass filter based on microstrip line construction comprises signal input part 1, signal output part 2, the first uniform transmission line unit, 3, the first interdigitated coupled structures 4, the second interdigitated coupled structure 5, the first interdigital capacitor unit 6, the first stub unit 7, the second interdigital capacitor unit 8, the first compensation transmission line unit 9, the second uniform transmission line unit 10, matrix 11 and the second compensation transmission line unit 12; Be provided with the first uniform transmission line unit 3 on the matrix 11 successively, the first interdigitated coupled structure (4), compensation transmission line unit 9, the second interdigitated coupled structure 5, the second uniform transmission line unit 10, the first interdigitated coupled structure 4 or the second interdigitated coupled structure 5 include the first interdigital capacitor unit 6, the first stub unit 7, the second interdigital capacitor unit 8, the second compensation transmission line unit 12, the two ends of the first stub unit 7 connect two second compensation transmission line unit 12, both sides are respectively equipped with the first interdigital capacitor unit 6 and the second interdigital capacitor unit 8 in the middle of the first stub unit 7, signal input part 1 is connected with the first interdigital capacitor unit 6 of the first interdigitated coupled structure 4 by the first uniform transmission line unit 3, and signal output part 2 is connected with the second interdigital capacitor unit 8 of the second interdigitated coupled structure 5 by the second uniform transmission line unit 10.
The ratio that the described first interdigital capacitor unit 6 and the second interdigital capacitor unit 8 refer to is 1: 1, and the spacing that refers to is 0.1～0.4mm.The described first uniform transmission line unit 3 and the second uniform transmission line unit 10 all are the transmission lines of 50 Ω.Described signal input part 1 outer signal source, the pumping signal that adds is by the first uniform transmission line unit 3, the first interdigitated coupled structure 4, the first compensation transmission line unit 9, the second interdigitated coupled structure 5 and the second uniform transmission line unit 10,, realize signal is carried out filtering after signal output part 2 arrives external circuits.Described matrix 11 is the low-k material.
Embodiment 1
Interdigitated microwave double frequency band-pass filter based on microstrip line construction:
The selection dielectric constant is 2.65 polytetrafluoroethylmaterial material making matrix, and thickness is 1mm.The length of the first uniform transmission line unit and the second uniform transmission line unit is 9.2mm, and width is 3.5mm, and the first interdigital capacitor unit 6 and the second interdigital capacitor unit 8 refer to be four, and the spacing that refers to is 0.2mm.The first uniform transmission line unit and the second uniform transmission line unit all are the transmission lines of 50 Ω.The left and right sides, the first stub unit has four to refer to intersect with the first uniform transmission line unit and the second uniform transmission line unit respectively, the length of the second compensation transmission line unit is 2.3mm, width is 0.3mm, and the length of the first compensation transmission line unit is 7.5mm, and width is 3.5mm.The overall dimensions of interdigitated microwave double frequency band-pass filter is 56 * 18mm
2Based on the interdigitated microwave double frequency band-pass filter performance curve of microstrip line construction as shown in Figure 2, be double frequency band-pass filter based on the interdigitated microwave double frequency band-pass filter of microstrip line construction, the 3dB working frequency range is at 6.75～7.35GHz and 12.15～13.8GHz.In 6.75～7.35GHz passband, the maximum attenuation of S21 is 0.1dB.In 12.15～13.8GHz passband, maximum attenuation S21 is 0.21dB.
Claims (5)
1. interdigitated microwave double frequency band-pass filter based on microstrip line construction, it is characterized in that comprising signal input part (1), signal output part (2), the first uniform transmission line unit (3), the first interdigitated coupled structure (4), the second interdigitated coupled structure (5), the first interdigital capacitor unit (6), the first stub unit (7), the second interdigital capacitor unit (8), the first compensation transmission line unit (9), the second uniform transmission line unit (10), matrix (11) and the second compensation transmission line unit (12); Be provided with the first uniform transmission line unit (3) on the matrix (11) successively, the first interdigitated coupled structure (4), compensation transmission line unit (9), the second interdigitated coupled structure (5), the second uniform transmission line unit (10), the first interdigitated coupled structure (4) or the second interdigitated coupled structure (5) include the first interdigital capacitor unit (6), the first stub unit (7), the second interdigital capacitor unit (8), the second compensation transmission line unit (12), the two ends of the first stub unit (7) connect two second compensation transmission line unit (12), both sides are respectively equipped with the first interdigital capacitor unit (6) and the second interdigital capacitor unit (8) in the middle of the first stub unit (7), signal input part (1) is connected with the first interdigital capacitor unit (6) of the first interdigitated coupled structure (4) by the first uniform transmission line unit (3), and signal output part (2) is connected with the second interdigital capacitor unit (8) of the second interdigitated coupled structure (5) by the second uniform transmission line unit (10).
2. a kind of interdigitated microwave double frequency band-pass filter according to claim 1 based on microstrip line construction, it is characterized in that the ratio that the described first interdigital capacitor unit (6) and the second interdigital capacitor unit (8) refer to is 1: 1, the spacing that refers to is 0.1～0.4mm.
3. a kind of interdigitated microwave double frequency band-pass filter based on microstrip line construction according to claim 1 is characterized in that the described first uniform transmission line unit (3) and the second uniform transmission line unit (10) all are the transmission lines of 50 Ω.
4. a kind of interdigitated microwave double frequency band-pass filter according to claim 1 based on microstrip line construction, it is characterized in that described signal input part (1) outer signal source, the pumping signal that adds is by the first uniform transmission line unit (3), the first interdigitated coupled structure (4), first compensation transmission line unit (9), the second interdigitated coupled structure (5) and the second uniform transmission line unit (10),, realize signal is carried out filtering after signal output part (2) arrives external circuit.
5. a kind of interdigitated microwave double frequency band-pass filter based on microstrip line construction according to claim 1 is characterized in that described matrix (11) is the low-k material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201013735U CN201576729U (en) | 2010-01-22 | 2010-01-22 | Interdigital microwave dual-band band-pass filter based on microstrip line structure |
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| CN2010201013735U CN201576729U (en) | 2010-01-22 | 2010-01-22 | Interdigital microwave dual-band band-pass filter based on microstrip line structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881972A (en) * | 2012-07-04 | 2013-01-16 | 上海大学 | Miniaturized UWB filter based on interdigital capacitor |
| CN106549201A (en) * | 2016-10-09 | 2017-03-29 | 清华大学 | A kind of wave filter being made up of the H type micro-strip resonantors with slotting finger tip mouth |
| CN107632193A (en) * | 2017-09-28 | 2018-01-26 | 东南大学 | A kind of microwave power detector based on metamaterial structure |
| CN108428980A (en) * | 2018-03-26 | 2018-08-21 | 南京邮电大学 | A kind of new structural broadband vertical interdigital capacitor |
| CN112952320A (en) * | 2021-01-29 | 2021-06-11 | 重庆两江卫星移动通信有限公司 | Tubular filter of reference total parameter |
-
2010
- 2010-01-22 CN CN2010201013735U patent/CN201576729U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881972A (en) * | 2012-07-04 | 2013-01-16 | 上海大学 | Miniaturized UWB filter based on interdigital capacitor |
| CN106549201A (en) * | 2016-10-09 | 2017-03-29 | 清华大学 | A kind of wave filter being made up of the H type micro-strip resonantors with slotting finger tip mouth |
| CN106549201B (en) * | 2016-10-09 | 2019-07-02 | 清华大学 | A kind of filter by having the H-type micro-strip resonantor for inserting finger tip mouth to form |
| CN107632193A (en) * | 2017-09-28 | 2018-01-26 | 东南大学 | A kind of microwave power detector based on metamaterial structure |
| CN108428980A (en) * | 2018-03-26 | 2018-08-21 | 南京邮电大学 | A kind of new structural broadband vertical interdigital capacitor |
| CN112952320A (en) * | 2021-01-29 | 2021-06-11 | 重庆两江卫星移动通信有限公司 | Tubular filter of reference total parameter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100908 Termination date: 20110122 |