CN206134897U - Bi -pass area microstrip filter - Google Patents
Bi -pass area microstrip filter Download PDFInfo
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- CN206134897U CN206134897U CN201620357766.XU CN201620357766U CN206134897U CN 206134897 U CN206134897 U CN 206134897U CN 201620357766 U CN201620357766 U CN 201620357766U CN 206134897 U CN206134897 U CN 206134897U
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- transmission line
- filter
- microstrip filter
- metallic wiring
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Abstract
The utility model provides a minor matters loading type bi -pass area microstrip filter is provided with left and right symmetrical patterns's metallic wiring on metal surface, this metallic wiring is provided with left and right symmetrical patterns's metallic wiring, and this metallic wiring includes " one " type inputoutput port of left and right symmetry, still include " pi " type multi -mode transmission line of left and right symmetry and " one " type transmission line of source end and load end coupling. The utility model provides a traditional bi -pass area microstrip filter's bulky, stopband rejection is poor and the loss is big shortcoming.
Description
Technical field
This utility model is related to a kind of low-loss micro-strip filter of compact conformation, specifically a kind of minor matters loaded type
Double-band-pass microstrip filter.
Background technology
With the development of wireless communication technology, traditional single frequency band communication system is increasingly difficult to meet the need of radio communication
Ask.The double frequency and Multi-Frequency Signaling System for being capable of compatible existing various communications band resources is the important development side of radio communication from now on
To.Application as the double-passband filter in double-frequency communication system can be more and more extensive.Traditional microstrip type dual-passband filtering
Device is formed in parallel by the single-pass band microstrip filter of two passages.The distinct disadvantage of the structure is that volume is big, has serious leading to
Road interference problem.
Multi-mode filter is one of the technological approaches for realizing double-passband filter.In a cavity, there may be several
Resonant frequency is equal or the pattern that is sufficiently close to, by adjusting filter construction the resonant frequency of each mode of resonance is existed
At different band connection frequencies, double-passband filter just can be realized.At present, it is humorous using a kind of micro-strip multimode in microstrip filter
Shake unit, by adding perturbed structure on the plane of symmetry, realizes double-passband filter.And multi-mode filter all unavoidably needs
Plus perturbation technique and the coupled structure of perturbation, the difficulty of processing technique is increased.
The content of the invention
The purpose of this utility model is to provide a kind of minor matters loaded type Double-band-pass microstrip filter, with compact conformation,
The characteristics of stopband inhibition is good and consumes energy little.
This utility model includes the metal surface of wave filter and the dielectric layer of metal back layer and centre, the technology for being adopted
Scheme is：The metallic circuit of left and right symmetrical pattern is provided with metal surface, the metallic circuit includes left and right symmetrical
" one " type transmission line that " π " type multimode resonance line and source and load end are coupled；Also including the source of two ends " one " type
With load end transmission line and input/output port.
The beneficial effects of the utility model are：Compared with existing double-passband filter, wave filter of the present utility model
Structure is the mixed structure of multimode line and normal transmission line.Due to the setting using such a population structure, formed
Resonant element constitute a resonant element with multiple modes of resonance, when using, by corresponding construction parameter, such as load
Length of transmission line and position, the adjustment of input source and load end coupled transfer distance between centers of tracks etc., it is possible to achieve the filtering of dual-passband
Device characteristic.Compared with prior art, with compact dimensions, the distinguishing feature that return loss is low, harmonic suppression effect is good.
Description of the drawings
With reference to the accompanying drawings and examples the utility model is described in further detail.
Fig. 1 is this utility model structural representation.
Fig. 2 is this utility model frequency characteristic schematic diagram.
In figure：1st, metal surface, 2, dielectric layer, 3, metal back layer, 4, input/output port, 5, coupled transmission line, 6, source
End and load end coupled transmission line, 7, multimode resonance line, 8, loaded transmission line.
Specific embodiment
Fig. 1, shown in 2：The wave filter combined by the dielectric layer 2 of metal surface 1 and metal back layer 3 and centre,
The metallic circuit of left and right symmetrical pattern is provided with metal surface 1, the metallic circuit includes left and right symmetrical " π " type multimode
Resonance line 7 and source and " one " the type transmission line 6 of load end coupling；Also pass including the source and load end of two ends " one " type
Defeated line 5.
Shown in Fig. 2：It is shown that wave filter design of Simulation and the S parameter of measurement in figure.Find out from S11 curves, passband
Return loss reach more than 20dB, illustrate that wave filter realizes good matching properties in passband.Find out from S21 curves,
There are two passbands.Stopband suppression level between passband reaches more than 30dB, and can be clearly observed in stopband has 3 to have
Limit transmission zero.
In being embodied as, by design and adjust the loaded transmission line 8 on multimode line 7 position and length controlling
The resonant frequency of two passbands of wave filter processed；Energy coupling is adjusted by controlling coupled transmission line 5 with the spacing of multimode line 7
Power；By controlling the length of source and load end coupled transmission line 6 and with the spacing of coupled transmission line 5 adjusting transmission zero
Position, the frequency characteristic being finally reached shown in Fig. 2.
Claims (1)
1. a kind of metal surface of Double-band-pass microstrip filter, including wave filter（1）And metal back layer（3）And the medium of centre
Layer（2）, it is characterised in that：In metal surface（1）On be provided with the metallic circuit of left and right symmetrical pattern, the metallic circuit includes
Left and right symmetrical " π " type multimode resonance line（7）, the input/output port of setting（4）With the source of two ends " one " type and
Load end transmission line（5）And source and " one " type transmission line of load end coupling（6）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620357766.XU CN206134897U (en) | 2016-04-26 | 2016-04-26 | Bi -pass area microstrip filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620357766.XU CN206134897U (en) | 2016-04-26 | 2016-04-26 | Bi -pass area microstrip filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206134897U true CN206134897U (en) | 2017-04-26 |
Family
ID=58560463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620357766.XU Expired - Fee Related CN206134897U (en) | 2016-04-26 | 2016-04-26 | Bi -pass area microstrip filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206134897U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713409A (en) * | 2019-01-30 | 2019-05-03 | 华南理工大学 | A kind of three band Planer filters based on multimode resonator |
-
2016
- 2016-04-26 CN CN201620357766.XU patent/CN206134897U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713409A (en) * | 2019-01-30 | 2019-05-03 | 华南理工大学 | A kind of three band Planer filters based on multimode resonator |
| CN109713409B (en) * | 2019-01-30 | 2023-11-03 | 华南理工大学 | Three-frequency-band plane filter based on multimode resonator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20180426 |