CN1414658A - Folding micro strip line resonantor and its filter - Google Patents
Folding micro strip line resonantor and its filter Download PDFInfo
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- CN1414658A CN1414658A CN 02156888 CN02156888A CN1414658A CN 1414658 A CN1414658 A CN 1414658A CN 02156888 CN02156888 CN 02156888 CN 02156888 A CN02156888 A CN 02156888A CN 1414658 A CN1414658 A CN 1414658A
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Abstract
A resonator with fold-shape of microstrip line and its filter are disclosed in the present invention. The said resonator consists of three microstrip lines such as common strip, inner strip and outer strip, which are arranged in sequence in parallel with two ends of the said common strip to be connected with one and of inner and outer strips separately to form a open end and a close, end the filter consists of a resonator array constituted by multiple fold-shape resonator with the same structure to be arranged in parallel of sequence. The said resonator has two and two outer strip at inside with open ends towards opposite directions and to be placed in stagger for forming multiple resonator set. Each two resonator sets are placed in left and right symmetrical positions and to place a cross-coupling line of reinforced coupling between
Description
Technical field
The invention belongs to the technical field of microwave narrow-band, particularly the microwave filter structural design.
Background technology
Filter is a kind of crucial microwave component, and its major function is to be used for crossover frequency, promptly blocks the signal of other frequencies by the signal of certain frequency.Desirable filter characteristic should be passband undamped and in cut-off region decay infinitely great, the saltus step of passband and cut-off region is precipitous as much as possible.Reach the precipitous characteristic of band edge, generally can be improved by the joint number that increases filter.The increase of joint number will be introduced loss significantly, make pass band damping become big, and performance of filter worsens.This makes that the loss of common microstripline filter is generally bigger, and to the field of having relatively high expectations, for example satellite application does not just reach desired index, generally at this moment just can only realize with waveguide device.
In recent years,, comprised the development of single crystal samples and film etc., and made the practicability of super conductive filter become possibility along with the preparation technology of high temperature superconducting materia.The loss of superconductive micro-strip line filter is little, and anti-adjacent frequency interference performance is strong, resonator Q value high (in several thousand MHz scopes, its Q value can reach 40000-100000).Utilize these characteristics of superconductive micro-strip line, can replace waveguide filter with the superconductive micro-strip line filter.From existing experimental result, the superconductive micro-strip line filter can have precipitous band edge, and the extremely low smooth pass-band performance of insertion loss more approaches ideal filter on performance.Therefore the superconductive micro-strip line filter not only have can with the performance of waveguide device analogy, and it is little to have the microstrip line volume simultaneously concurrently, lightweight advantage.
Filter Structures has played decisive role to the characteristic of filter.At present, the target of design is to make under the as far as possible little prerequisite of overall filter, makes the in-band insertion loss of filter lower, and band edge is steeper.
Fig. 1 has shown one the 8 joint Open-loop shape super conductive filter that Britain delivered in 2000, and substrate material is LaAlO
3, be of a size of 39*23.5mm.Its resonator is 8 ring-band shapes that a breach is arranged (marking with digital 1-8 respectively among the figure) that distribute with axial symmetry, and the width of breach is Wg.Analyze its electromagnetic field as can be known, the opening that electric field mainly is distributed in ring goes out, and therefore is equivalent to an electric capacity herein; Magnetic field mainly is distributed in the opposite side of ring, so the microstrip line of ring-type approaches inductance.Input and output feeder line 11 and 12 width W O correspondence 50 ohm of input and output impedances, and the length of feeder line is got several millimeters according to technological requirement and got final product not influence of performance of filter.Feeder line 11 and 12 and separately adjacent resonators 1 and 8 position contacting determine by the input and output impedance matching.8 resonator shape sizes are close or identical, and its ring-band shape microstrip line total length is about at this LaAlO
3Half of on-chip filter center frequency corresponding wavelength.Distance between each resonator has determined the performance of filter.Distance in the design between each resonator of need adjustment is till filter response meets the demands.
Fig. 2 is the frequency response chart of filter under 55K and low noise amplifier combination condition for this reason.Among the figure, 21 is the loss S21 characteristic curve of filter, and 22 is the reflection loss S11 characteristic curve of filter.Its passband inserts loss and is about 0.13dB, and band edge steepness low side is 20dB/MHz, and high-end is 15dB/MHz.Though the resonator Q value of this filter is very high, have in the good band and steepness, but because its resonator shape is too huge, and can not very effectively utilize the substrate space, so having limited it can not increase joint number very high, can fundamentally improve its steepness and increase the filter joint number, so this kind structure is not very good yet.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, proposed to organize the filter of structure based on the resonator of new structure and with it, its resonator adopts folding shaped microstrip line structure, use filter of its group structure to have to insert loss little, band is outer to suppress big, advantages such as transition band is precipitous, and the while overall dimensions is little.
The present invention proposes a kind of folding shaped microstrip line resonator, it is characterized in that this resonator is made of the public band that is arranged in parallel successively, interior band and three microstrip lines of tyre, wherein, said public band two ends are connected with an end of interior band, tyre respectively, constitute an openend and a blind end.
The width of said three microstrip lines can be identical, also can be different.
The present invention proposes a kind of filter that constitutes based on above-mentioned folding shaped microstrip line resonator group, it is characterized in that, forms the resonator battle array by the folding shape resonator of a plurality of same structures that are arranged in parallel successively; This resonator is in twos in addition interior, and openend staggers and places a plurality of resonator group of formation towards on the contrary; Per two resonator group left-right symmetric are placed, place one section cross-couplings line that strengthens coupling between the tyre outside of adjacent two resonator openends of two resonator group, the input and output feeder line is connected with a hithermost separately resonator in the described resonator battle array.
Said cross-couplings line can be made of two vertical sections and a horizontal segment.
Effect of the present invention:
The filter of the present invention design under equal joint number condition, in-band insertion loss, attenuation outside a channel, performances such as band edge steepness reach the performance index of external similar super conductive filter, and size is less than Open-loop shape super conductive filter.The present invention can make of superconductor, also can use other material.The present invention forms the joint number of filter and can determine as required, each organize resonator parallel but up and down not necessarily the alignment.Therefore as long as adopt the filter of folding shape resonator structure design all to belong to protection scope of the present invention.
Description of drawings
Fig. 1 is the topology layout schematic diagram of existing a kind of 8 joint Open-loop shape super conductive filters.
Fig. 2 is the response curve of existing 8 joint Open-loop shape super conductive filters.
Fig. 3 is the topology layout schematic diagram of a kind of folding shape resonator embodiment of the present invention.
Fig. 4 is the topology layout schematic diagram of the folding mode filter embodiment of a kind of 12 joint superconductions of the present invention.
Fig. 5 is the response curve of this folding shape super conductive filter embodiment.
Embodiment
The folding shape resonator of the present invention's design and microwave filter thereof reach accompanying drawing in conjunction with the embodiments and are described in detail as follows:
The topology layout of a kind of mini strip line resonator embodiment of the present invention's design as shown in Figure 3.Be connected to form folding shape resonator by three sections microstrip lines 31,32 and 33 ends, 31 is public band, all links to each other with 32,33, and 32 is that 33 is interior band in addition, and 34 is openend, and 35 is blind end.Each section microstrip line length and between distance can require to determine according to the specific design of filter.The microstrip line total length of whole folding shape resonator is about half of filter center frequency corresponding wavelength.
A kind of high temperature superconduction wave filter example structure layout of the present invention's design as shown in Figure 4.The filter center frequency is 902.5MHz, and relative bandwidth is 2.77%.White portion is the MgO substrate among the figure, and length is 21mm, highly is 32mm, and drawing oblique line partly is the superconductive micro-strip line.Input and output feeder line 431 and 432 width are all 0.5mm, and corresponding to 50 ohm of input and output impedances, feeder line length is 1.8mm, is 6.5mm apart from the substrate distance from top, is connected with 412 with adjacent resonators 401 respectively.401 to 412 is 12 identical folding shape resonators of dimensional structure, and in twos in addition interior, openend staggers and places a plurality of resonator group of formation towards on the contrary; Per two resonator group left-right symmetric are placed, and strengthen coupling by one section cross-couplings line between the tyre outside of adjacent two resonator openends of two resonator group.Resonator 401,404,405,408,409,412 and cross-couplings line 421,423,425 hangings are 1.6mm apart from the substrate distance from top, and all the other resonators and the alignment of cross-couplings line bottom also are 1.6mm apart from the substrate distance from bottom.With the 1st resonator 401 is the size that example illustrates resonator.Whole folding shape resonator 401 is the 0.1mm except that public 4011 width of being with, all the other everywhere micro belt line width be all 0.2mm, public 4011 length of being with are 16.35mm, in to be with 4012 length be 16.05mm, 4013 length are 16.15mm in addition, distance between public band and the interior band is 0.31mm, interior band and in addition between distance be 0.04mm, whole microstrip line total length is about filter center frequency half of corresponding wavelength on this substrate.Distance between the resonator 401 and 402, be that distance between the tyre of tyre resonator 402 of resonator 401 is 0.18mm, distance between 403 and 404 is 0.36mm, distance between 405 and 406 is 0.37mm, distance between 407 and 408 is 0.37mm, distance between 409 and 410 is 0.36mm, and the distance between 411 and 412 is 0.18mm.
Strengthen coupling by the cross-couplings line between resonator group and the group, 421 to 425 is 5 cross-couplings lines, each is made of two vertical sections and a horizontal segment, except that horizontal segment length has nothing in common with each other, each cross-couplings linear dimension structure is identical, and the distance between the tyre of vertical section and arest neighbors resonator is all 0.04mm.With cross-couplings line 421 is the size that example illustrates the cross-couplings line.Whole cross-couplings line live width everywhere is all 0.2mm, and two vertical section 4211,4212 length are 2mm, and horizontal segment 4213 length are 2.81mm.Cross-couplings line 422 horizontal section lengths are 3.05mm, and 423 horizontal section lengths are 3.06mm, and 424 horizontal section lengths are 3.05mm, and 425 horizontal section lengths are 2.81mm.
The present invention can be easy to go out with this structural design the filter of other joint numbers.The present invention can also use LaAlO
3, other material such as Sapphire substrate.
Fig. 5 is the response curve of this filter embodiment, and solid line 51 is a loss S21 curve among the figure, and dotted line 52 is a reflection loss S11 curve, and it is 0.1dB that passband inserts loss, and band edge steepness low side is 20dB/MHz, and high-end is 17dB/MHz.Under the situation that increases the filter joint number, band edge can be more precipitous, and outer inhibition of band can be better.
Claims (3)
1, a kind of folding shaped microstrip line resonator, it is characterized in that this resonator is made of the public band that is arranged in parallel successively, interior band and three microstrip lines of tyre, wherein, said public band two ends are connected with an end of interior band, tyre respectively, constitute an openend and a blind end.
2, a kind of filter that constitutes based on folding shaped microstrip line resonator group as claimed in claim 1 is characterized in that, forms the resonator battle array by the folding shape resonator of a plurality of same structures that are arranged in parallel successively; This resonator is in twos in addition interior, and openend staggers and places a plurality of resonator group of formation towards on the contrary; Per two resonator group left-right symmetric are placed, place one section cross-couplings line that strengthens coupling between the tyre outside of adjacent two resonator openends of two resonator group, the input and output feeder line is connected with a hithermost separately resonator in the described resonator battle array.
3, a kind of filter that constitutes based on folding shaped microstrip line resonator group as claimed in claim 1 is characterized in that, said cross-couplings line can be made of two vertical sections and a horizontal segment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02156888 CN1414658A (en) | 2002-12-20 | 2002-12-20 | Folding micro strip line resonantor and its filter |
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| CN 02156888 CN1414658A (en) | 2002-12-20 | 2002-12-20 | Folding micro strip line resonantor and its filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856613A (en) * | 2011-06-29 | 2013-01-02 | 汤姆森特许公司 | High rejection band-stop filter and diplexer using such filters |
| CN103178319A (en) * | 2013-03-26 | 2013-06-26 | 华南理工大学 | Interdigital coupling duplexer |
| CN103943920A (en) * | 2014-04-30 | 2014-07-23 | 西安电子科技大学 | Four-passband duplexer based on branch knot loading stepped impedance resonator |
| CN103972617A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Broadband duplexer based on stub-loaded dual-mode resonator |
| CN104091980A (en) * | 2014-06-20 | 2014-10-08 | 华南理工大学 | Band-pass filter with wide stop band suppression |
| CN108539337A (en) * | 2018-04-09 | 2018-09-14 | 浙江嘉科电子有限公司 | A kind of novel crossed coupling membrane low-pass filter |
| CN109088134A (en) * | 2018-07-04 | 2018-12-25 | 深圳三星通信技术研究有限公司 | A kind of microstrip bandpass filter |
| CN110197940A (en) * | 2019-06-13 | 2019-09-03 | 中国电子科技集团公司第二十九研究所 | A kind of improved barrette line filter and its operating method |
-
2002
- 2002-12-20 CN CN 02156888 patent/CN1414658A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856613A (en) * | 2011-06-29 | 2013-01-02 | 汤姆森特许公司 | High rejection band-stop filter and diplexer using such filters |
| CN103178319A (en) * | 2013-03-26 | 2013-06-26 | 华南理工大学 | Interdigital coupling duplexer |
| CN103943920A (en) * | 2014-04-30 | 2014-07-23 | 西安电子科技大学 | Four-passband duplexer based on branch knot loading stepped impedance resonator |
| CN103972617A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Broadband duplexer based on stub-loaded dual-mode resonator |
| CN103972617B (en) * | 2014-05-16 | 2016-04-13 | 西安电子科技大学 | The broadband duplexer of dual-mode resonator is loaded based on minor matters |
| CN104091980A (en) * | 2014-06-20 | 2014-10-08 | 华南理工大学 | Band-pass filter with wide stop band suppression |
| CN104091980B (en) * | 2014-06-20 | 2017-01-04 | 华南理工大学 | A kind of band filter of Wide stop bands suppression |
| CN108539337A (en) * | 2018-04-09 | 2018-09-14 | 浙江嘉科电子有限公司 | A kind of novel crossed coupling membrane low-pass filter |
| CN108539337B (en) * | 2018-04-09 | 2019-07-30 | 浙江嘉科电子有限公司 | A kind of novel crossed coupling membrane low-pass filter |
| CN109088134A (en) * | 2018-07-04 | 2018-12-25 | 深圳三星通信技术研究有限公司 | A kind of microstrip bandpass filter |
| CN109088134B (en) * | 2018-07-04 | 2021-02-23 | 深圳三星通信技术研究有限公司 | Microstrip band-pass filter |
| CN110197940A (en) * | 2019-06-13 | 2019-09-03 | 中国电子科技集团公司第二十九研究所 | A kind of improved barrette line filter and its operating method |
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