CN104733817A - Stacked cascaded two cavity substrate integrated waveguide dual mode bandpass filter - Google Patents
Stacked cascaded two cavity substrate integrated waveguide dual mode bandpass filter Download PDFInfo
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Abstract
A stacked cascaded two cavity substrate integrated waveguide dual mode bandpass filter comprises two substrate integrated waveguide resonant cavities arranged up and down through stacked cascaded, a belt-type line connecting the two resonant cavities, a microstrip line serving as input and output of the filter and a coupling probe. The filter has the advantages that size is small, manufacture and machining are facilitated, performances are excellent, and the requirements on a radio frequency filter by a modern wireless communication system are met.
Description
Technical field
The present invention relates to microwave technical field, belong to a kind of passive component of extensive use in microwave circuit.Stacked cascade two chamber substrate integration wave-guide bimodule band-pass filter
Background technology
Filter is a kind of passive component be widely used in microwave and radio circuit, and its index quality directly affects the performance of whole system.The requirement of Modern Communication System to microwave and radio-frequency filter miniaturization is more and more higher, substrate integration wave-guide (Substrate Integrated waveguide, because superior performance has again simultaneously, size is little is easy to integrated advantage to the filter of SIW) structure, receives the extensive attention of domestic and international researcher in recent years.Dual mode filter due to a chamber dual-purpose, therefore have obviously advantage dimensionally, adopt substrate integration wave-guide design dual mode filter can be described as the advantage combining both.The level of substrate integration wave-guide dual mode filter is associated with two kinds of modes, and one is that two resonant cavitys are placed at grade, and this mode is technically relatively simple, but to be planar dimension too large for shortcoming, loses the advantage in original size.Another kind be stacked on top of one another place, the advantage in this mode size clearly, but technically acquires a certain degree of difficulty, at present there are no can technical scheme realize.
Summary of the invention
The problem to be solved in the present invention is: be not more than the prerequisite of the planar dimension of single cavity at planar dimension under, how to realize two the resonant cavity stacked on top of one another placements of substrate integration wave-guide dual mode filter and carries out cascade.
Technical scheme of the present invention is: stacked cascade two chamber substrate integration wave-guide bimodule band-pass filter, adopt the multilayer circuit structure of dual mode filter cascade, described band pass filter comprises the resonant cavity of two substrate integration wave-guides, strip line, microstrip line and coupling probe, described resonant cavity stacked on top of one another is placed, the input and output of resonant cavity are probe coupling structure, probe adopts metallic vias, cascade structure is connected to form by probe and strip line between adjacent resonators, the input and output of described band pass filter adopt microstrip line, microstrip line is connected with the coupling probe of the head and the tail input and output of described cascade structure, form the input/output structure of described band pass filter.
Described strip line is between adjacent resonators, utilize the up and down metal covering of metal covering as strip line of upper and lower two resonant cavitys, between the output coupling probe of one of them resonant cavity and the input coupling probe of another resonant cavity, realize cascade by strip line.
As expansion, according to above-mentioned Cascading Methods, realize stacked cascade substrate integration wave-guide band pass filter, based on multilayer circuit structure, the resonant cavity stacked on top of one another of multiple substrate integration wave-guide is placed and carries out cascade, the input and output of resonant cavity are probe coupling structure, probe adopts metallic vias, cascade structure is connected to form by probe and strip line between adjacent resonators, the input and output of described band pass filter adopt microstrip line, microstrip line is connected with the coupling probe of the head and the tail input and output of described cascade structure, forms the input/output structure of described band pass filter.
The present invention makes full use of the design feature of multilayer circuit, the input and output of resonant cavity is designed to the perforate of metallic plate up and down at cavity by the structure of probe coupling.The Out-of-band rejection of the filter after cascade is greater than 40dB, and in band, Insertion Loss is less than 2dB, and the return loss of input/output port is greater than 20dB.
The present invention devises a kind of Out-of-band rejection and reaches more than 40dB and the substrate integrated wave guide structure band pass filter with good selecting frequency characteristic, play the thin advantage of substrate integration wave-guide thickness to greatest extent, connecting wire structure simultaneously between two cavitys is simple, is easy to processing.And the performance parameter of this filter is substantially identical with two cavity substrate integration wave-guide dual mode filters of plane cascade, described concatenation technology can also be applied to the cascade of multiple resonant cavity simultaneously.The present invention has the following advantages: size is little, be easy to processing and fabricating, and superior performance, meets the requirement of modern wireless communication systems radio frequency filter simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of band pass filter of the present invention.
Fig. 2 is the performance parameter schematic diagram of the embodiment of the present invention.
Embodiment
Accompanying drawing 1 is structural representation of the present invention, design of filter is in the layered media be made up of 6 layers of dielectric substrate, adopt the multilayer circuit structure of dual mode filter cascade, band pass filter comprises two substrate integration wave-guide bimodulus resonant cavitys, strip line, microstrip line and probes, two resonant cavity stacked on top of one another are placed, be respectively resonant cavity 2, lower resonant cavity 1, input and output are probe coupling structure, probe adopts metallic vias, strip line 7, between two resonant cavitys, utilizes the up and down metal covering of metal covering as strip line of upper and lower two resonant cavitys; Realize cascade by strip line 7 between the output of one of them resonant cavity and the input of another resonant cavity, remaining constrained input connects microstrip line, forms the input and output of described band pass filter.In figure, the resonant cavity of numbering 1,2 is two identical bimodulus resonant cavitys, and planar structure is square, adding two perturbation probes, being two metallic vias during actual fabrication to produce bimodulus effect in two bights of symmetry.Label 3,4 is input and output microstrip line, label 5,6 is the coupling probes between resonant cavity and microstrip line, and adopt metal via structures, label 8,9 is coupling probes of attaching strap-like line, also adopt metal via structures, the probe size of label 5,6,8,9 is identical.
Below by embodiment, enforcement of the present invention is described.
Case study on implementation 1
Contrast accompanying drawing 1, filter centre frequency design is at 2.5GHz, and the relative bandwidth of passband is 6.4%, and the dielectric board material of use is Rogers R03010, and relative dielectric constant is that 10.2,6 layers of dielectric thickness are identical, is 1.5 millimeters.The length of side of square resonant cavity is 49mm, the metallic vias of serving as perturbation probe is positioned on the diagonal of cavity, be 8mm with the distance at cavity edge, diameter is 1.0mm, the metallic vias diameter serving as coupling probe is 1.5mm, be 13.5mm with the distance at cavity edge, the width of microstrip line is 5.5mm, and the width of strip line is 3.2mm.
Contrast accompanying drawing 2, it gives the performance parameter curve of case study on implementation 1.This filter passband is 2.41GHz ~ 2.57GHz as seen from the figure, and in band, Insertion Loss is less than 2dB, and the return loss of input/output port is about greater than 20dB.Out-of-band rejection low side is greater than 50dB, is high-endly greater than 40dB at below 2.8GHz.Laboratory sample performance parameter shows that this performance of filter is superior, and size is little, structure simple, be easy to processing.
Concatenation technology of the present invention can also be applied to the cascade of multiple resonant cavity, the resonant cavity stacked on top of one another of multiple substrate integration wave-guide is placed and carries out cascade, the input and output of resonant cavity are probe coupling structure, probe adopts metallic vias, cascade structure is connected to form by probe and strip line between adjacent resonators, the input and output of described band pass filter adopt microstrip line, microstrip line is connected with the coupling probe of the head and the tail input and output of described cascade structure, forms the input/output structure of described band pass filter.Described strip line, between adjacent resonators, utilizes the up and down metal covering of metal covering as strip line of upper and lower two resonant cavitys.
Claims (5)
1. stacked cascade two chamber substrate integration wave-guide bimodule band-pass filter, it is characterized in that the multilayer circuit structure adopting dual mode filter cascade, described band pass filter comprises the resonant cavity of two substrate integration wave-guides, strip line, microstrip line and coupling probe, described resonant cavity stacked on top of one another is placed, the input and output of resonant cavity are probe coupling structure, probe adopts metallic vias, cascade structure is connected to form by probe and strip line between adjacent resonators, the input and output of described band pass filter adopt microstrip line, microstrip line is connected with the coupling probe of the head and the tail input and output of described cascade structure, form the input/output structure of described band pass filter.
2. stacked cascade two chamber according to claim 1 substrate integration wave-guide bimodule band-pass filter, it is characterized in that described strip line is between adjacent resonators, utilize the up and down metal covering of metal covering as strip line of upper and lower two resonant cavitys, between the output coupling probe of one of them resonant cavity and the input coupling probe of another resonant cavity, realize cascade by strip line.
3. stacked cascade two chamber according to claim 1 substrate integration wave-guide bimodule band-pass filter, is characterized in that the Out-of-band rejection of described band pass filter reaches more than 40dB.
4. stacked cascade substrate integration wave-guide band pass filter, it is characterized in that based on multilayer circuit structure, the resonant cavity stacked on top of one another of multiple substrate integration wave-guide is placed and carries out cascade, the input and output of resonant cavity are probe coupling structure, probe adopts metallic vias, cascade structure is connected to form by probe and strip line between adjacent resonators, the input and output of described band pass filter adopt microstrip line, microstrip line is connected with the coupling probe of the head and the tail input and output of described cascade structure, forms the input/output structure of described band pass filter.
5. stacked cascade substrate integration wave-guide band pass filter according to claim 4, is characterized in that described strip line is between adjacent resonators, utilizes the up and down metal covering of metal covering as strip line of upper and lower two resonant cavitys.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654481A (en) * | 2016-11-30 | 2017-05-10 | 北京邮电大学 | Substrate integrated waveguide filter with independently adjustable double bands |
| CN108987924A (en) * | 2018-07-16 | 2018-12-11 | 西安电子科技大学 | Substrate integration wave-guide bimodulus filter antenna with more radiation zeros |
| CN109818142A (en) * | 2018-12-31 | 2019-05-28 | 瑞声科技（南京）有限公司 | A kind of filter antenna |
| CN110571508A (en) * | 2019-08-01 | 2019-12-13 | 中国电子科技集团公司第二十九研究所 | Broadband integrated antenna |
| CN111293388A (en) * | 2019-02-25 | 2020-06-16 | 江南大学 | Substrate integrated waveguide filter based on electromagnetic hybrid coupling |
| WO2020140554A1 (en) * | 2018-12-31 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Millimetre wave ltcc filter |
| WO2020140557A1 (en) * | 2018-12-31 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Millimeter wave ltcc filter |
| WO2020140556A1 (en) * | 2018-12-31 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Millimeter wave ltcc filter |
| CN112563701A (en) * | 2020-11-17 | 2021-03-26 | 杭州电子科技大学 | Dual-mode substrate integrated waveguide filter based on perturbation rectangular cavity |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654481A (en) * | 2016-11-30 | 2017-05-10 | 北京邮电大学 | Substrate integrated waveguide filter with independently adjustable double bands |
| CN106654481B (en) * | 2016-11-30 | 2019-05-14 | 北京邮电大学 | A kind of double frequency-band Independent adjustable substrate integral wave guide filter |
| CN108987924A (en) * | 2018-07-16 | 2018-12-11 | 西安电子科技大学 | Substrate integration wave-guide bimodulus filter antenna with more radiation zeros |
| CN109818142A (en) * | 2018-12-31 | 2019-05-28 | 瑞声科技（南京）有限公司 | A kind of filter antenna |
| WO2020140554A1 (en) * | 2018-12-31 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Millimetre wave ltcc filter |
| WO2020140557A1 (en) * | 2018-12-31 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Millimeter wave ltcc filter |
| WO2020140556A1 (en) * | 2018-12-31 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Millimeter wave ltcc filter |
| US11056777B2 (en) | 2018-12-31 | 2021-07-06 | AAC Technologies Pte. Ltd. | Millimeter wave LTCC filter |
| CN111293388A (en) * | 2019-02-25 | 2020-06-16 | 江南大学 | Substrate integrated waveguide filter based on electromagnetic hybrid coupling |
| CN110571508A (en) * | 2019-08-01 | 2019-12-13 | 中国电子科技集团公司第二十九研究所 | Broadband integrated antenna |
| CN112563701A (en) * | 2020-11-17 | 2021-03-26 | 杭州电子科技大学 | Dual-mode substrate integrated waveguide filter based on perturbation rectangular cavity |
| CN112563701B (en) * | 2020-11-17 | 2021-10-08 | 杭州电子科技大学 | Dual-mode substrate integrated waveguide filter based on perturbation rectangular cavity |
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