CN201332134Y - Multiple-circular arc resonant cavity double-mode band-pass filter - Google Patents
Multiple-circular arc resonant cavity double-mode band-pass filter Download PDFInfo
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- CN201332134Y CN201332134Y CNU2009200387979U CN200920038797U CN201332134Y CN 201332134 Y CN201332134 Y CN 201332134Y CN U2009200387979 U CNU2009200387979 U CN U2009200387979U CN 200920038797 U CN200920038797 U CN 200920038797U CN 201332134 Y CN201332134 Y CN 201332134Y
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Abstract
A multiple-circular arc resonant cavity double-module band-pass filter is a miniaturization microstrip double-mode band-pass filter capable of improving the performance greatly, the microwave medium substrate comprises a resonant cavity (1) composed of multiple sections of circular arcs (1), 50 ohm input-output feeder lines and coupling arms (7), wherein, 50 ohm input-output feeder lines comprise input feeder lines (2) and output feeder lines (3), the coupling arms comprise an input coupling arm (6) and an output coupling arm (7); wherein, the outer arcs of four semi-circular arcs are opposite and arranged symmetrical to the center of the filter, two ends of four threequarter circular arcs (5) are respectively connected with two neighboring threequarter circular arcs (5); the input feeder line (2) is connected with the input coupling arm (5), the input coupling arm is positioned on one side outside of the resonant cavity, the output feeder line (3) is connected with the output coupling arm (7), the output coupling arm (7) is positioned ay the other side outside of the resonant cavity (1), and the input feeder line (2) is vertical to the output feeder line (3).
Description
Technical field
The utility model is a kind of miniaturization and micro-strip double-module (dual-mode) band pass filter that can improve performance greatly, especially a kind of many circular arcs microstrip bimodule band-pass filter of miniaturisation high-performance.
Background technology
Along with the continuous development of mobile communication, satellite communication, radar and remote sensing technology, system has proposed more and more higher requirement to the microwave filter design of radio frequency receiving and transmitting front end.Advantages such as the filter of microstrip structure is easy to design because of it, and is integrated have easily obtained using widely in the communications electronics system.Along with the development of integrated circuit technique, the volume of transceiver reduces just day by day, and under the requirement of this trend, the Miniaturization Research of filter just more and more becomes the focus of research.But common microstrip structure filter volume is bigger, can not satisfy the requirement of at present various small-sized transmitting-receiving communication systems for radio-frequency filter.
The microstrip filter of bimodulus structure has the advantage that volume is little, in light weight and cost is low, therefore has been subjected to common attention and attention. and the bimodulus microstrip filter can equivalence be double-tuned resonant circuit as a kind of special filter in actual applications.Therefore, the quantity of the filter paster of use can reduce by half, and corresponding circuit size also can reduce, and has saved circuit space.Based on above characteristic, dual mode filter is applied in the various small-sized transmitting-receiving communication systems more and more widely.But general bimodulus microstrip filter than significant disadvantages be differential loss and microstrip structure filter in its relatively large band intrinsic harmonic frequency.This has influenced the application of bimodulus microstrip filter in mobile communication to a certain extent.
The utility model adopts a kind of new microstrip bandpass filter structure on the basis of traditional square dual mode filter.This structure has well solved the big problem of radiation loss of traditional double mode filter, more effectively suppresses high order harmonic component output simultaneously.And on the little advantage of general bimodulus microstrip filter volume, further dwindled the area of filter.This filter is expected to be applied in multiple microwave system and mobile communication system.
Summary of the invention
Technical problem: the utility model proposes a kind of many circular arcs resonant cavity bimodule band-pass filter, it is small and exquisite that this structure has volume, makes simply, and it is integrated to be convenient to planar circuit, can improve performance of filter greatly simultaneously, is applicable to multiple small-sized transmitting-receiving communication system.
Technical scheme: the utility model is development and coming on the basis of tradition side ring bimodule band-pass filter.The resonator of this filter is made up of multi-section circular arc, has the identical orthogonal a plurality of paired field mode (being degenerate mode) of resonance frequency in resonant cavity, but low order degenerate mode the time is only used in work.Simultaneously two sections circular arcs are set on the symmetry axis of resonant circuit, produce coupling between the field mode of two quadratures, and cause the resonance frequency division as perturbed structure.Be equivalent to the effect that a resonant circuit plays two resonators physically, thereby constitute the two-stage filter that satisfies certain performance requirement, saved circuit area.50 ohm of feeder lines of input and output are coupled by the coupling arm resonant cavity.By size that changes perturbed structure and the bandwidth that the distance between the coupling arm resonant cavity can be regulated filter.Specific practice is:
On the microwave-medium substrate, comprise resonant cavity that multi-section circular arc forms, 50 ohm of input and output feeder lines, coupling arm; Wherein, resonant cavity is that four semi arches and four four/three-arcs are formed, and 50 ohm of input and output feeder lines comprise incoming feeder and output feeder, and coupling arm comprises input coupling arm and output coupling arm; Wherein, the extrados of four semi arches is relative, the central distribution of this filter of symmetry, and the two ends of four four/three-arcs join with adjacent two four/three-arcs respectively; Incoming feeder joins with the input coupling arm, and the input coupling arm is positioned at the outer side of resonant cavity, and output feeder joins with the output coupling arm, and it is perpendicular that the output coupling arm is positioned at outer opposite side of resonant cavity and incoming feeder and output feeder.Four semi arches that live width is different and four four/three-arcs form the bimodulus resonant cavity.
Beneficial effect:
1. this band pass filter can dwindle area greatly owing to utilize special structure to produce the bimodulus characteristic, satisfies the requirement of Modern Communication System miniaturization.
2. the filter stop bend characteristic produces by adopting, thereby increases the bandwidth and the suppression characteristic of stopband.Because the coupling amount increases, can obtain differential loss in the lower band simultaneously.
3. filter adopts microstrip line as the input and output feeder line, can make things convenient for the microwave planar circuit height integratedly, is fit to mobile compact apparatus and uses.
4. this filter construction is simple, all utilizes little band PCB explained hereafter, and cost is low, precision is high, good reproducibility, is fit to standardized production.
Description of drawings
Fig. 1 is embodiment 1 structural representation, long measure: mm,
Fig. 2 is the arrowband S21 measurement of reflection-factor result of embodiment 1.
Fig. 3 is the arrowband S11 measurement of reflection-factor result of embodiment 1.
Fig. 4 is the broadband S21 measurement of reflection-factor result of embodiment 1.
Have among the figure: resonant cavity 1, perturbed structure 2,4, four four/three-arcs 5 of 3, four semi arches of output feeder, input coupling arm 6 is with output coupling arm 7.
Embodiment
In order further to reduce the filter volume, the utility model is realized by the shape that changes resonant cavity.This resonant cavity is made up of four semi arches and four four/three-arcs, and such structure has made full use of the ring inner area, makes the Microstrip Loop line after the expansion elongated, is directly proportional because resonance frequency is the girth of resonant cavity, thereby makes the resonance frequency step-down.When holding frequency was constant, the area of plane of micro-strip resonantor diminished.Make circuit structure on the little advantage of dual mode filter volume, further dwindle circuit area.
In the design of resonant cavity, adopt the different way of live width of semi arch and four/three-arc simultaneously, make in resonant cavity, to have the stepped impedance characteristic, produce the slow wave effect thus, can increase the secondary and the multiple harmonic suppression characteristic of filter greatly.Simultaneously coupling arm also adopts the multi-section circular arc structure, can increase the coupling amount between 50 ohm of feeder line resonant cavity of input and output like this, reduces differential loss in the band of filter.
This Filter Design is based on the plane electric circuit technology as a kind of novel microband paste filter, the employing feed microstrip line.Its volume is small and exquisite, and it is integrated to be fit to level.Have miniaturization, easily make, Insertion Loss is little, suppresses characteristics such as height
By resonant cavity 1. this novel many circular arcs bimodulus microstrip bandpass filter is, perturbed structure 2., 4. 3. coupling arm formed with 50 ohm of input and output feeder lines.Should do following consideration when design: four semi arch live widths of (1) formation resonator should be wideer than the live width of four four/three-arcs.Thereby produce the stepped impedance characteristic, suppress harmonic component.(2) the input and output coupling arm also can take circular shape to reduce circuit area, increases the coupling amount simultaneously, reduces differential loss in the band.(3) the continuous 50 ohm of feeder lines of input and output of resonator can be deep into the resonator recess, can further dwindle the filter volume.(4) live width of distance and perturbation circular arc can influence the coupling amount between the coupling arm resonant cavity by regulating, and microwave energy is coupled into fully to be coupled out in passband.
Filter construction as shown in Figure 2, dimensional units is mm.The substrate material of this embodiment is RT/Duriod 6010 sheet materials, and dielectric constant is 10.2, and the tangent angle loss is 0.002, and thickness is 0.635mm.Arrowband S21, S11 and the broadband S21 parameter measurements of actual measurement embodiment 1 are shown in Fig. 2～Fig. 4.
Claims (2)
1. the bimodule band-pass filter of circular arc resonant cavity more than a kind is characterized in that comprising resonant cavity (1) that multi-section circular arc forms, 50 ohm of input and output feeder lines, coupling arm on the microwave-medium substrate; Wherein, resonant cavity (1) is that four semi arches (4) and four four/three-arcs (5) are formed, and 50 ohm of input and output feeder lines comprise incoming feeder (2) and output feeder (3), and coupling arm comprises input coupling arm (6) and output coupling arm (7); Wherein, the extrados of four semi arches (4) is relative, the central distribution of this filter of symmetry, and the two ends of four four/three-arcs (5) join with adjacent two four/three-arcs (5) respectively; Incoming feeder (2) joins with input coupling arm (6), input coupling arm (6) is positioned at the outer side of resonant cavity (1), output feeder (3) joins with output coupling arm (7), and it is perpendicular that output coupling arm (7) is positioned at outer opposite side of resonant cavity (1) and incoming feeder (2) and output feeder (3).
2. many circular arcs resonant cavity bimodule band-pass filter according to claim 1, it is characterized in that four semi arches that live width is different and four four/three-arcs form the bimodulus resonant cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200387979U CN201332134Y (en) | 2009-01-09 | 2009-01-09 | Multiple-circular arc resonant cavity double-mode band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200387979U CN201332134Y (en) | 2009-01-09 | 2009-01-09 | Multiple-circular arc resonant cavity double-mode band-pass filter |
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| CN201332134Y true CN201332134Y (en) | 2009-10-21 |
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| CNU2009200387979U Expired - Fee Related CN201332134Y (en) | 2009-01-09 | 2009-01-09 | Multiple-circular arc resonant cavity double-mode band-pass filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465458B (en) * | 2009-01-05 | 2012-09-05 | 东南大学 | Miniaturisation high-performance microstrip bimodule band-pass filter |
| WO2014071721A1 (en) * | 2012-11-08 | 2014-05-15 | 华为技术有限公司 | Filter, receiver, transmitter and transceiver |
| US9042847B2 (en) | 2012-11-08 | 2015-05-26 | Hauwei Technologies Co., Ltd. | Filter, receiver, transmitter and transceiver |
| CN106058412A (en) * | 2016-05-13 | 2016-10-26 | 电子科技大学 | Polarization resonator, filter and regulating method thereof |
-
2009
- 2009-01-09 CN CNU2009200387979U patent/CN201332134Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465458B (en) * | 2009-01-05 | 2012-09-05 | 东南大学 | Miniaturisation high-performance microstrip bimodule band-pass filter |
| WO2014071721A1 (en) * | 2012-11-08 | 2014-05-15 | 华为技术有限公司 | Filter, receiver, transmitter and transceiver |
| US9042847B2 (en) | 2012-11-08 | 2015-05-26 | Hauwei Technologies Co., Ltd. | Filter, receiver, transmitter and transceiver |
| CN106058412A (en) * | 2016-05-13 | 2016-10-26 | 电子科技大学 | Polarization resonator, filter and regulating method thereof |
| CN106058412B (en) * | 2016-05-13 | 2019-01-22 | 电子科技大学 | The adjusting method and filter of a kind of Tai Ji type resonator, filter |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091021 Termination date: 20150109 |
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| EXPY | Termination of patent right or utility model |