CN1607695A - Micro band filter with fork-shaped hair pin type structure for microwave communication - Google Patents
Micro band filter with fork-shaped hair pin type structure for microwave communication Download PDFInfo
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- CN1607695A CN1607695A CN 200310106660 CN200310106660A CN1607695A CN 1607695 A CN1607695 A CN 1607695A CN 200310106660 CN200310106660 CN 200310106660 CN 200310106660 A CN200310106660 A CN 200310106660A CN 1607695 A CN1607695 A CN 1607695A
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Abstract
A forked hairpin structure micro band filter is composed of a resonator array containing an input micro-strip, an output micro-strip and multiple forked hairpin resonators which is a fork hairpin structure, distances between the open-ends are different from the distance between micro strip lines at both sides of the turning ends and the distance between the turning ends with strong coupled action are smaller than the distance between the open-ends to form two parts of a ladder which has the following advantage: said filter weakens the coupled action of the turning position so as to reduce the sensitivity of the filter frequency response property to the circuit structure of said zone.
Description
(1) technical field:
The present invention relates to a kind of band pass filter that is applicable to that microwave communication is used, particularly a kind of microstrip filter that is applicable to forked class hair clip formula (Forked-Hairpin) structure of microwave communication, this filter can be made with high-temperature superconducting thin film.
(2) background technology:
For a long time, filter plays an important role in the processing of electronic signal always, and it has signal that filters frequency of utilization and the function that suppresses interference signal.Along with the fast development of microwave wireless communication, more and more higher requirement has been proposed for the electric property of filter.The high temperature superconduction wave filter technology that developed recently gets up has well adapted to this demand, because high-temperature superconducting thin film has very high quality factor (Q value), so microstrip filter that adopts high-temperature superconducting thin film to make, have extremely low insertion loss and excellent frequency selective characteristic (upper passband edge steepness), make in its reception and emission system that is specially adapted to mobile communication base station.Mobile communication base station uses after the high temperature superconduction wave filter, can increase the area coverage of base station, the interference of reduction noise, improves speech quality; And can reduce the transmitting power of mobile phone, and significantly reduce the influence of electromagenetic wave radiation to human brain, reach requirements of green environmental protection.
The microwave filter that uses high-temperature superconducting thin film to make mostly is the planar structure of microstrip type, for half-wave resonator formula coupling filter, its circuit basic comprising is generally: the little band of the input of signal, export the micro-strip resonantor of little band, a plurality of generation resonance coupling, the effective length of resonator is the half-wavelength of centre frequency, and multipole resonator is to the electromagnetic excitation of corresponding frequencies and coupled transfer effect and finally reach filtration treatment to microwave signal.The project organization scheme that multiple maturation is arranged at present is to adapt to different specification requirements:
Accompanying drawing 2 is the filter construction of another kind of hair clip formula resonator, please see for details in M.Sagawa, K.Takahashi, and M.Makimoto, " Miniaturized Hairpin ResonatorFilters and their Application to Receiver Front-End MIC ' s ", IEEETrams.MTTvol.37, pp.1991-1997 (December 1998), in this kind project organization, the front end of resonator opening is shortened, and produce very strong capacity effect, resonator demonstrates half block shape (semi-lumped) character, promptly capacitive effects is showed in upper end (openend), and the inductive effect is showed in the lower end.The resonator direction of this filter construction all is in the same way, in order to shorten whole resonator length, the capacitive part of resonator can be increased and inductive part is dwindled, but its quality factor (Q value) will reduce along with such adjustment;
(3) summary of the invention:
The objective of the invention is to design a kind of microwave communication with forked class hair pin type structure microstrip filter, it is a kind of microwave band-pass filter, it is little that it has a volume, high passband selectivity, high noise suppresses the characteristics of ability, and suitable use has the high-temperature superconducting thin film of high-quality-factor and makes the high-temperature superconduction microwave filtering device.
Technical scheme of the present invention: a kind of microwave communication is with forked class hair pin type structure microstrip filter, it is characterized in that it forms by the little band of input, the little band of output with by the resonator battle array that the resonator of a plurality of forked class hair pin type structures is formed.This micro-strip resonantor is a forked class hair pin type structure, in this structure, spacing between the both sides microstrip line of the openend of resonator and turn end is different, wherein the spacing of the stronger turn end of coupling is less than the spacing of the more weak openend of coupling, form two parts of stepped connection, and two-part length can be the same or different.
The joint number of the forked class hair clip formula resonator in the above-mentioned said filter can determine according to the actual needs, the direction alternatively up and down of resonator, is arranged in parallel successively and effective length is a half-wavelength.
Forked class hair clip formula resonator in the above-mentioned said filter is when being arranged in parallel, and the openend position of resonator can be concordant with the junction of the openend of adjacent resonators and turn end, also can be not concordant.
The little band of the input of above-mentioned said filter, the little band of output separately with the resonator battle array in the most contiguous resonator directly be connected.
The turn end of the forked class hair clip formula resonator in the above-mentioned said filter can be designed to different geometries according to need, can be rectangular-shaped, stepped, trapezoidal shape or semicircle shape.
Above-mentioned said filter available metal film is made, and is more suitable for using the high-temperature superconducting thin film with high-quality-factor to make.
Superiority of the present invention is: 1, microwave communication has good frequency selectivity and stopband suppression characteristic with forked class hair pin type structure microstrip filter, 2, forked class hair pin type structure microstrip filter has weakened the coupling of the stronger turning point of coupling in the filter construction, thereby reduced the sensitiveness of filter freguency response characteristic to this area circuit structure, 3, because weakening of coupling can be dwindled the overall dimensions of filter operating circuit; 4, the present invention not only can be used for traditional plane common metal microstrip filter, more is applicable to make the high temperature superconduction wave filter with high-quality-factor, is applied in the various microwave communication system.
(4) description of drawings:
Accompanying drawing 2 is the filter construction schematic diagram of existing half block shape (semi-lumped) hair clip formula resonator.
Accompanying drawing 3 is the structural representation of the related a kind of microwave communication of the present invention with forked class hair clip formula resonator.
Accompanying drawing 4 for the related a kind of microwave communication of the present invention with forked class hair pin type structure microstrip filter structural representation.
Accompanying drawing 5 is the frequency response chart of the related a kind of microwave communication of the present invention with forked class hair pin type structure microstrip filter, and the number of poles of filter is designed to 12 utmost points.
Wherein: 10 is the filter of typical hair clip formula resonator, and 11 is hair clip formula resonator, and 12 import little band for signal, and 13 export little band for signal, and 14 is the openend of hair clip formula resonator, and 15 is the turn end of hair clip formula resonator; 20 is the filter of half block shape (semi-lumped) formula resonator, 21 is half block shape resonator, and 22 import little band for signal, and 23 export little band for signal, 24 is the openend (capacity effect end) of half block shape resonator, and 25 is the turn end (inductive effect end) of half block shape resonator; 30 is forked class hair pin type structure resonator, 31 is the openend of forked class hair clip formula resonator, 32 is the turn end of forked class hair clip formula resonator, 33a, 33b are little band on the both sides of formation resonator, L1 is the length of the openend of forked class hair clip formula resonator, and d1 is the spacing of openend microstrip line, and L2 is the length of the turn end of forked class hair clip formula resonator, d2 is the spacing of turn end microstrip line, and 34 is the junction of openend and turn end; 40 is forked class hair pin type structure microstrip filter, 41 import little band for signal, 42 export little band for signal, 1,2,3,4,5......2n-4,2n-3,2n-2,2n-1,2n be respectively the 1st, 2,3,4,5 ... 2n-4,2n-3,2n-2,2n-1, a 2n resonator.50 for adopting the frequency response S21 curve of forked class hair pin type structure microstrip filter, and 51 for adopting the frequency response S11 curve of forked class hair pin type structure microstrip filter.
(5) embodiment:
Embodiment: a kind of microwave communication is with forked class hair pin type structure microstrip filter, it is characterized in that it by input little with 41, output is little with 42 be made up of the resonator battle array that the resonator 30 of a plurality of forked class hair pin type structures is formed.This micro-strip resonantor 30 is a forked class hair pin type structure, in this structure, spacing between both sides microstrip line 33a, the 33b of the openend 31 of resonator 30 and turn end 32 is different, wherein the spacing d2 of the stronger turn end 32 of coupling is less than the spacing d1 of the more weak openend 31 of coupling, form two parts of stepped connection, and two-part length L 1, L2 can be the same or different.
The joint number of the forked class hair clip formula resonator 30 in the above-mentioned said filter can determine according to the actual needs, the direction alternatively up and down of resonator, is arranged in parallel successively and effective length is a half-wavelength.
Forked class hair clip formula resonator 30 in the above-mentioned said filter is when being arranged in parallel, and openend 31 positions of resonator can be concordant with the junction 34 of the openend 31 of adjacent resonators and turn end 32, also can be not concordant.
The input of above-mentioned said filter little with 41, output little with 42 separately with the resonator battle array in the most contiguous resonator 1,2n directly be connected.
The turn end of the forked class hair clip formula resonator 30 in the above-mentioned said filter can be designed to different geometries according to need, can be rectangular-shaped, stepped, trapezoidal shape or semicircle shape.
Above-mentioned said filter available metal film is made, and is more suitable for using the high-temperature superconducting thin film with high-quality-factor to make.
Claims (6)
1, a kind of microwave communication is with forked class hair pin type structure microstrip filter, it is characterized in that it forms by the little band of input, the little band of output with by the resonator battle array that the resonator of a plurality of forked class hair pin type structures is formed.This micro-strip resonantor is a forked class hair pin type structure, in this structure, spacing between the both sides microstrip line of the openend of resonator and turn end is different, wherein the spacing of the stronger turn end of coupling is less than the spacing of the more weak openend of coupling, form two parts of stepped connection, and two-part length can be the same or different.
2, according to the said a kind of microwave communication of claim 1 with forked class hair pin type structure microstrip filter, the joint number that it is characterized in that the forked class hair clip formula resonator in the said filter can determine according to the actual needs, the direction alternatively up and down of resonator, is arranged in parallel successively and effective length is a half-wavelength.
3, according to the said a kind of microwave communication of claim 1 with forked class hair pin type structure microstrip filter, it is characterized in that forked class hair clip formula resonator in the said filter is when being arranged in parallel, the openend position of resonator can be concordant with the junction of the openend of adjacent resonators and turn end, also can be not concordant.
4, according to the said a kind of microwave communication of claim 1 with forked class hair pin type structure microstrip filter, the little band of input, the little band of output that it is characterized in that said filter separately with the resonator battle array in the most contiguous resonator directly be connected.
5, according to the said a kind of microwave communication of claim 1 with forked class hair pin type structure microstrip filter, the turn end that it is characterized in that the forked class hair clip formula resonator in the said filter can be designed to different geometries according to need, can be rectangular-shaped, stepped, trapezoidal shape or semicircle shape.
6, according to the said a kind of microwave communication of claim 1 with forked class hair pin type structure microstrip filter, it is characterized in that said above-mentioned said filter available metal film makes, be more suitable for using high-temperature superconducting thin film to make with high-quality-factor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310106660 CN1607695A (en) | 2003-10-16 | 2003-10-16 | Micro band filter with fork-shaped hair pin type structure for microwave communication |
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| CN 200310106660 CN1607695A (en) | 2003-10-16 | 2003-10-16 | Micro band filter with fork-shaped hair pin type structure for microwave communication |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217210B (en) * | 2008-01-04 | 2011-06-29 | 东南大学 | A three frequency band filter based on parallel coupled line structure |
| CN101546856B (en) * | 2008-03-27 | 2012-07-04 | 中国科学院物理研究所 | Planar superconducting microstrip resonator |
| CN107732382A (en) * | 2017-09-07 | 2018-02-23 | 南京理工大学 | A kind of Ku band filters |
-
2003
- 2003-10-16 CN CN 200310106660 patent/CN1607695A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217210B (en) * | 2008-01-04 | 2011-06-29 | 东南大学 | A three frequency band filter based on parallel coupled line structure |
| CN101546856B (en) * | 2008-03-27 | 2012-07-04 | 中国科学院物理研究所 | Planar superconducting microstrip resonator |
| CN107732382A (en) * | 2017-09-07 | 2018-02-23 | 南京理工大学 | A kind of Ku band filters |
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