CN103474731A - Branch knot loading compact type microstrip filter - Google Patents
Branch knot loading compact type microstrip filter Download PDFInfo
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- CN103474731A CN103474731A CN 201310399277 CN201310399277A CN103474731A CN 103474731 A CN103474731 A CN 103474731A CN 201310399277 CN201310399277 CN 201310399277 CN 201310399277 A CN201310399277 A CN 201310399277A CN 103474731 A CN103474731 A CN 103474731A
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Abstract
The invention provides a branch knot loading compact type microstrip filter. Metal circuits with left-right symmetrical patterns are arranged on a metal surface layer. The metal circuits comprise bent input-output ports which are left-right symmetrical and arranged in a Z shape, source end and load loading transmission lines and input-output couplers which are inwardsafter bending. The source end and the loading transmission lines are connected in a bending mode. The branch knot loading compact type microstrip filter further comprises a T-shaped opening circuit loading upper transmission line, a T-shaped opening circuit loading lower transmission line and left-right-parallel even transmission line resonance units of a downward bent structure. The T-shaped opening circuit loading upper transmission line and the T-shaped opening circuit loading lower transmission line are located at a middle position and of a cross-shaped crossing structure and arranged vertically. The branch knot loading compact type microstrip filter solves the problem that a traditional microstrip filter is large in size, low in stop band restrain level and high in loss.
Description
Technical field
The present invention relates to a kind of low-loss micro-strip filter of compact conformation, a kind of minor matters load the compact microstrip filter specifically.
Background technology
In microwave integrated circuit, micro-band is most widely used transmission line, and it structurally is convenient to external microwave solid-state device.The microband paste resonator is widely used for designing filter.Common microstrip filter structure is even parallel lines coupled structure.The distinct disadvantage of this structure be volume large, serious frequency multiplication harmonic wave interference problem arranged.
Through pertinent literature is retrieved and is found, 2003, proposed to load with open circuited transmission line the method for uniform transmission line resonant cavity in Compact Microstrip Bandpass Filter With Two Transmission Zeros Using a Stub Tapped Half Wavelength Line Resonator mono-literary composition that the people such as L.Zhu deliver on IEEE Microwave and Wireless Components Letters periodical, realized the outer limited transmission zero of band of filter, strengthened the inhibition of filter, but open circuit loaded line volume is large, be unfavorable for that filter miniaturization and device are integrated.
Summary of the invention
The object of the present invention is to provide a kind of minor matters to load the compact microstrip filter, resonant cavity and loading minor matters transmission line combination are integrated, when realizing filter function, can control flexibly the outer limited transmission zero location of band and harmonic wave inhibition level, in the situation that stopband inhibition level is remained unchanged, the filter volume reduces greatly.
The present invention includes metal surface and metal back layer and the middle dielectric layer of filter, the technical scheme adopted is: be provided with the metallic circuit of left and right symmetrical pattern on metal surface, this metallic circuit comprises that left and right symmetry " Z " type arranges source and the load loaded transmission line that the input/output port after bending is connected with bending and the input and output that bend in backward are coupled; The uniform transmission line resonant element of transmission line and the parallel downward bending structure in left and right under the "T"-shaped open circuit setting up and down of the criss-cross construction in the middle of also comprising loads upper transmission line and "T"-shaped open circuit loads.
The invention has the beneficial effects as follows: with existing filter, compare, the resonant element that the structure of filter of the present invention forms is a resonant element with 3 modes of resonance, can be by adjusting corresponding the structural parameters for example electrical length, resonance frequency and the outer limited transmission zero location of band that T-shaped open circuit loaded transmission line length is adjusted resonator structure of input and output coupling.Further, the present invention has the advantages such as return loss is lower, the harmonic wave inhibition is better.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is structural representation of the present invention.
Fig. 2 is frequency characteristics schematic diagram of the present invention.
In figure: 1, metal surface, 2, dielectric layer, 3, metal back layer, 4, input/output port, 5, source and load loaded transmission line, 6, the input and output coupling, 7, "T"-shaped open circuit loads upper transmission line, and 8, "T"-shaped open circuit loads lower transmission line, 9, the uniform transmission line resonant element.
Embodiment
Shown in Fig. 1,2: the filter combined by metal surface 1 and metal back layer 3 and middle valency matter layer 2, be provided with the metallic circuit of left and right symmetrical pattern on metal surface 1, this metallic circuit comprises that left and right symmetry " Z " type arranges source and the load loaded transmission line 5 that the input/output port 4 after bending is connected with bending and the input and output that bend in backward are coupled 6; The uniform transmission line resonant element 9 of transmission line 8 and the parallel downward bending structure in left and right under the "T"-shaped open circuit setting up and down of the criss-cross construction in the middle of also comprising loads upper transmission line 7 and "T"-shaped open circuit loads.
Shown in Fig. 2: what in figure, show is the S parameter of filter design of Simulation.Find out from the S11 curve, more than the return loss of passband reaches 20dB, illustrate that in passband, filter has been realized good matching properties.Find out from the S21 curve, more than stopband inhibition level reaches 20dB, and can observe significantly in stopband 2 limited transmission zeros are arranged.
In concrete enforcement, control the resonance frequency of filter by the length of uniform transmission line 9 in the middle of design and adjusting; Adjust the power of Energy Coupling by the spacing 6 of control source and load loading minor matters 5 and uniform transmission line 9; Load the position of length and the outer limited transmission zero of length adjustment band that "T"-shaped open circuit loads lower transmission line 8 of upper transmission line 7 by regulating "T"-shaped open circuit, improve the noise inhibiting ability of filter, finally reach the frequency characteristics shown in Fig. 2.
Claims (1)
1. minor matters load the compact microstrip filter, the metal surface (1) and metal back layer (3) and the middle dielectric layer (2) that comprise filter, it is characterized in that: be provided with the metallic circuit of left and right symmetrical pattern on metal surface (1), this metallic circuit comprises that left and right symmetry " Z " type arranges source and the load loaded transmission line (5) that the input/output port (4) after bending is connected with bending and bends input and output in backward be coupled (6); The uniform transmission line resonant element (9) of transmission line (8) and the parallel downward bending structure in left and right under the "T"-shaped open circuit setting up and down of the criss-cross construction in the middle of also comprising loads upper transmission line (7) and "T"-shaped open circuit loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310399277 CN103474731A (en) | 2013-09-05 | 2013-09-05 | Branch knot loading compact type microstrip filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310399277 CN103474731A (en) | 2013-09-05 | 2013-09-05 | Branch knot loading compact type microstrip filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103474731A true CN103474731A (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201310399277 Pending CN103474731A (en) | 2013-09-05 | 2013-09-05 | Branch knot loading compact type microstrip filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700911A (en) * | 2013-12-31 | 2014-04-02 | 上海海事大学 | Novel T-shaped dual-mode micro-strip band-pass filter |
| CN104020364A (en) * | 2014-04-04 | 2014-09-03 | 湖北文理学院 | Magnetic-field detector of common-mode current noise |
| CN105161799A (en) * | 2015-08-25 | 2015-12-16 | 电子科技大学 | Microwave adjustable filter |
| CN105514544A (en) * | 2016-01-19 | 2016-04-20 | 厦门大学 | Plane compact spiral three-mode filter |
| CN105742769A (en) * | 2016-02-25 | 2016-07-06 | 南京邮电大学 | Harmonic suppression adjustable planar dual-mode T-shaped bandpass filter |
| CN106785261A (en) * | 2017-01-09 | 2017-05-31 | 华东交通大学 | A kind of adjustable bandpass filter of arrowband trap |
| CN104241749B (en) * | 2014-09-16 | 2017-11-07 | 电子科技大学 | A kind of controllable microstrip filter of transmission zero |
| CN110444841A (en) * | 2019-08-15 | 2019-11-12 | 重庆邮电大学 | A kind of wideband microstrip bandpass filter based on racemosus section load resonator |
-
2013
- 2013-09-05 CN CN 201310399277 patent/CN103474731A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700911B (en) * | 2013-12-31 | 2015-09-09 | 上海海事大学 | A kind of novel T-shaped dual-mode microstrip band-pass filter |
| CN103700911A (en) * | 2013-12-31 | 2014-04-02 | 上海海事大学 | Novel T-shaped dual-mode micro-strip band-pass filter |
| CN104020364B (en) * | 2014-04-04 | 2016-08-17 | 湖北文理学院 | Common mode current noise field detecting device |
| CN104020364A (en) * | 2014-04-04 | 2014-09-03 | 湖北文理学院 | Magnetic-field detector of common-mode current noise |
| CN104241749B (en) * | 2014-09-16 | 2017-11-07 | 电子科技大学 | A kind of controllable microstrip filter of transmission zero |
| CN105161799A (en) * | 2015-08-25 | 2015-12-16 | 电子科技大学 | Microwave adjustable filter |
| CN105161799B (en) * | 2015-08-25 | 2019-04-09 | 电子科技大学 | Microwave tunable filter |
| CN105514544A (en) * | 2016-01-19 | 2016-04-20 | 厦门大学 | Plane compact spiral three-mode filter |
| CN105514544B (en) * | 2016-01-19 | 2019-04-26 | 厦门大学 | Compact three mode filter of screw type of plane |
| CN105742769A (en) * | 2016-02-25 | 2016-07-06 | 南京邮电大学 | Harmonic suppression adjustable planar dual-mode T-shaped bandpass filter |
| CN105742769B (en) * | 2016-02-25 | 2018-03-09 | 南京邮电大学 | The adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint |
| CN106785261A (en) * | 2017-01-09 | 2017-05-31 | 华东交通大学 | A kind of adjustable bandpass filter of arrowband trap |
| CN106785261B (en) * | 2017-01-09 | 2019-08-09 | 华东交通大学 | A kind of adjustable bandpass filter of narrowband trap |
| CN110444841A (en) * | 2019-08-15 | 2019-11-12 | 重庆邮电大学 | A kind of wideband microstrip bandpass filter based on racemosus section load resonator |
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Application publication date: 20131225 |
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| WD01 | Invention patent application deemed withdrawn after publication |