CN103715479B - Multi-band high-temperature superconducting filter - Google Patents
Multi-band high-temperature superconducting filter Download PDFInfo
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- CN103715479B CN103715479B CN201410023778.4A CN201410023778A CN103715479B CN 103715479 B CN103715479 B CN 103715479B CN 201410023778 A CN201410023778 A CN 201410023778A CN 103715479 B CN103715479 B CN 103715479B
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Abstract
The invention discloses a multi-band high-temperature superconducting filter which comprises a high-temperature superconducting substrate and N sub-filter circuit patterns with different frequency bands, formed on the substrate, wherein the input ends of sub-filters are respectively connected with second ports of corresponding circulators, a first port of the first circulator is used as an input end of the filter, a third port of the nth circulator is connected with a first port of the (n+1)th circulator, and a third port of a (N-1)th circulator is connected with an input port of an Nth sub-filter. Output ends of the sub-filters are connected by adopting a T-type micro-strip matching network or circulators, the circulators are made by adopting low-insertion loss materials working below a liquid nitrogen temperature region and have the advantage of small insertion loss under a low temperature environment. Meanwhile, the problem of difficulty in designing an input coupling network is overcome, and the volume of the filter is greatly reduced due to small size of a resonator. According to the multi-band high-temperature superconducting filter, the requirement of filtering signals of a plurality of bands is met, the out-of-band rejection degree is high, and the problem of difficulty in matching among the sub-filters is solved.
Description
Technical field
The invention belongs to superconduction components and parts design field, be related to high temperature superconduction wave filter part, particularly to one kind by
The high temperature superconduction wave filter of multiple subfilters multiple passages being formed in parallel.
Background technology
With the rapidly development of communications industry, various communication standards exist simultaneously so that frequency resource is more and more nervous, right
Requirement also more and more higher in the front end receiver equipment of wireless communication system.Concrete manifestation is efficient availability of frequency spectrum problem,
I.e. to have high selectivity, small size, low cost, flexible design radio-frequency filter have urgent needss.High temperature superconductor technology
At present development is more ripe, has using the wave filter of high temperature superconducting materia design that Insertion Loss is little, and band edge is precipitous, squareness factor
High feature, is therefore widely used in the communications field.But, superconductor itself is relatively costly, and due to current work
Caused by skill, the size of monolithic superconductor is difficult to while ensureing low cost make big, first device in superconduction radio-frequency filter field
The characteristics such as the small size of part, low cost, flexible design are particularly important.In addition, communication system requirements of today work simultaneously
In multiple communications bands with cost-effective, comb filter is requisite device in these systems.For this situation,
Engineer begins one's study and has the wave filter of many band connection frequencies characteristic.
Based on the problem of above-mentioned wave filter many band connection frequencies characteristic, current research point is concentrated mainly on following aspect：1、
Using the bimodulus characteristic of resonator, that is, resonator works are in two modes of resonance, the multiple mid frequencyes of correspondence.The method is again
Mainly there are two thinkings, one is to produce many passbands by using with the harmonic wave controlling step resonator, and another is then logical
Cross the method that short circuit or open circuit minor matters are loaded on uniform impedance resonator or non-homogeneous electric impedance resonator.The advantage of this technology
It is small volume, but design difficulty is big.Multiple passbands use same set of coupling network, are difficult to reach needed for each passband simultaneously
The coefficient of coup wanted, is accordingly difficult to adjust the bandwidth of each passband respectively, consults patent documentation and periodical literature, using this kind of method
The wave filter that all can only design two-stage or three-level, require higher wave filter design highly difficult for series, therefore very
Difficulty designs high performance broadband multi-frequency band filter.2nd, bandpass and band-rejection filter is integrated to complete multi-channel filter
The design of device.The shortcoming of the method is that volume is larger, and design is complicated, and debugging is difficult.3rd, multiple subfilter parallel arrangement.Use
Multiple subfilters realize multifrequency band-pass filter, and each subfilter realizes a passage respectively.But due to sub- filtering
The coupling network design difficulty of device is big, design wave filter volume is big, a lot of engineers just abandon this idea.
Content of the invention
The invention aims to solving the existing design side forming comb filter using multiple subfilters
In case, coupling network design difficulty is big and device volume is big deficiency is it is proposed that a kind of many passbands high temperature superconduction wave filter.
The technical scheme is that：Many passbands high temperature superconduction wave filter, including high-temperature superconductor substrate and be formed at substrate
On the different subfilter circuit pattern of N number of frequency band, N is the integer not less than 2；It is characterized in that, the input of subfilter
End also include N-1 with wherein N-1 subfilter one-to-one three-port circulator, the input port of subfilter distinguishes
It is connected with the second port of corresponding circulator；The first port of the 1st circulator is as filter input end；N-th circulator
The 3rd port be connected with the first port of the (n+1)th circulator, n be not less than 1 be not more than N-2 integer, N-1 circulator
The 3rd port be connected with the input port of N subfilter；Between the outfan of each subfilter by matching network even
Connect output.
Circulator Insertion Loss due to using under room temperature is larger, although being applied to energy during the wave filter based on high temperature superconducting materia
Effectively reduce circuit size, but do not ensure that the overall performance as high temperature superconduction wave filter；Even work as and be used for circuit
Loss control requires higher engineering field such as during communication base station, and such scheme cannot realize its parameter request substantially, is
Solution above-mentioned technical problem, present invention further propose that following improvement project：Described circulator works in low temperature environment, described
Low temperature environment is preferably identical with the low temperature environment of the superconducting circuit work of high temperature superconduction wave filter.
Preferably, above-mentioned high temperature superconduction wave filter includes three different subfilter circuit patterns of mid frequency.
Further, adopt the coupling output of microstrip circuit matching network between subfilter outfan.
Further, the above-mentioned microstrip circuit as matching network specially has the T junction of impedance mapping function.
Further, above-mentioned T junction is made up of Stepped Impedance transmission line, and T junction length is less than quarter-wave.
Further, above-mentioned matching network is N-1 circulator being arranged symmetrically with subfilter input.
Further, the output port of subfilter is connected with the second port of corresponding circulator respectively；1st goes in ring
3rd port of device is as filter output；3rd port of the (n+1)th circulator is connected with the first port of the n-th circulator
Connect, n is the integer being not more than N-2 not less than 1, the first port of N-1 circulator is connected with the output port of N subfilter
Connect.
Further, resonator is the Stepped Impedance resonance of the mid frequency in place subfilter bandwidth of operation for the resonance
Device.
Further, subfilter is eight rank generalized chebyshev band filters, sequentially in one line including eight
Resonator, and introduce cross-couplings at least between two non-adjacent resonators.
Further, the lanthanum aluminate base material that high-temperature superconductor substrate is 23.8 by dielectric constant, base material thickness is 0.5mm.
Beneficial effects of the present invention：Many passbands high temperature superconduction wave filter of the present invention be have devised using high temperature superconducting materia
High performance multichannel high temperature superconduction wave filter.Use multiple subfilter parallel arrangement, overcome input coupling network
The complicated, problem of difficult design.Employ the resonator of miniaturization, on the premise of meeting design requirement, wave filter simultaneously
Volume greatly reduces.And meeting the filtering requirements of multiple frequency band signals simultaneously, Out-of-band rejection degree is high, overcomes between subfilter
The difficult problem of coupling, compact conformation, flexible design.Particularly circulator is applied to the scheme of low temperature environment, makes circulator
Insertion loss substantially reduce, improve the overall performance of the multichannel high temperature superconduction wave filter of the present invention.
Brief description：
Fig. 1 is a kind of high temperature superconduction wave filter system block diagram of three passbands of the present invention；
Fig. 2 is a kind of high temperature superconduction wave filter embodiment structural representation of three passbands of the present invention；
Fig. 3 is the first subfilter structural representation of the high temperature superconduction wave filter of embodiment illustrated in fig. 2；
Fig. 4 is the second subfilter structural representation of the high temperature superconduction wave filter of embodiment illustrated in fig. 2；
Fig. 5 is the 3rd subfilter structural representation of the high temperature superconduction wave filter of embodiment illustrated in fig. 2；
Fig. 6 is the result analogous diagram of the triple channel high temperature superconduction wave filter of the embodiment of the present invention.
Specific embodiment
Embodiments of the invention are to design, below in conjunction with the accompanying drawings with specific examples below pair according to the principle of the present invention
The present invention is further elaborated.
As shown in figure 1, many passbands high temperature superconduction wave filter, including high-temperature superconductor substrate and the N number of frequency being formed on substrate
With different subfilter circuit patterns 2, N is the integer not less than 2；The input of subfilter also include N-1 with wherein
The one-to-one three-port circulator of N-1 subfilter, the input port of subfilter respectively with corresponding circulator
Two-port netwerk is connected；The first port of the 1st circulator is as filter input end；3rd port of the n-th circulator and the (n+1)th ring
The first port of row device is connected, and n is the integer being not more than N-2 not less than 1, and the 3rd port of N-1 circulator is filtered with N
The input port of ripple device is connected；N-1 circulator composition input matching network 1 of input substituted for traditional input
Match circuit.Due to commonly entering, end Match circuits are difficult and circuit scale is larger.Therefore setting using the present embodiment
Meter can effectively reduce design difficulty and reduce the overall dimensions of device.Pass through coupling between the outfan of each subfilter
Network connection exports.As a example three passband high temperature superconduction wave filters shown in by Fig. 1, the present invention to implement principle as follows：Defeated
Enter the first port input from circulator 1 for the signal, through second port output, in output signal, meet the design frequency band of wave filter 1
The filtered device of signal 1 after enter outfan matching network 3；Remaining signal is reflected back the second port of circulator 1 by wave filter 1
And it is input to the first port of circulator 2 through the 3rd port, signal exports to filtering further across the second port of circulator 2
Device 2, in the presence of wave filter 2, the signal output meeting its frequency band is to outfan matching network；The filtered device of remaining signal 2
After reflection, the second port through circulator 2, the 3rd port export to wave filter 3 successively, and will meet its frequency band by wave filter 3
Signal output to outfan matching network.Preferably, above-mentioned high temperature superconduction wave filter includes three different sons of mid frequency
Filter circuit pattern.Circulator Insertion Loss due to using under room temperature is larger, is applied to the wave filter based on high temperature superconducting materia
Although when can effectively reduce circuit size, do not ensure that the overall performance as high temperature superconduction wave filter；Even when use
Require higher engineering field in controlling to circuit loss such as during communication base station, such scheme cannot realize its parameter substantially
Require, in order to solve above-mentioned technical problem, the present embodiment is it is further proposed that following improvement project：Described circulator works in low temperature
Environment, described low temperature environment is preferably identical with the low temperature environment of the superconducting circuit work of high temperature superconduction wave filter.
In the outfan of above-mentioned wave filter, matching network can be using the output of microstrip circuit matching network.Specifically, above-mentioned
Microstrip circuit as matching network specially has the T junction of impedance mapping function.T junction is by Stepped Impedance transmission line structure
Become, T junction length is less than quarter-wave.Impedance matching is carried out by T junction, makes the filter characteristic of three passages mutually not
Interference.
Because the Circuit Matching network that outfan adopts equally has difficult design and the big deficiency of size, therefore in order to carry
The overall performance of high circuit, is preferably also adopted by circulator matching network in outfan.It is specially symmetrical with subfilter input
N-1 circulator of arrangement.The output port of subfilter is connected with the second port of corresponding circulator respectively；1st ring
3rd port of row device is as filter output；3rd port of the (n+1)th circulator is connected with the first port of the n-th circulator
Connect, n is the integer being not more than N-2 not less than 1, the first port of N-1 circulator is connected with the output port of N subfilter
Connect.
Above-mentioned resonator is the step impedance resonator of the mid frequency in place subfilter bandwidth of operation for the resonance.
As shown in Figures 2 to 5, subfilter is eight rank generalized chebyshev band filters, including eight sequentially words
The resonator arranging.The lanthanum aluminate base material that high-temperature superconductor substrate is 23.8 by dielectric constant and the thickness being formed on base material are
The yittrium oxide barium copper high-temperature superconducting thin film composition of 500nm, base material thickness is 0.5mm.
As shown in Figures 2 and 3, the first subfilter is the general Chebyshev filters of eight ranks, mainly by incoming feeder
11, output feeder 12, there is the transmission line being electrically connected non-adjacent resonators, and resonator collectively constitutes.Pass through
Transmission line introduces cross-couplings, adds transmission zero, improves the Out-of-band rejection degree of wave filter.Eight resonators are in a word
Type arranges, and the spacing between each resonator determines, incoming feeder and output feeder are directly electric with resonator by the characteristic of wave filter
Gas connects, and its access point position is relevant with impedance matching.In this specific embodiments, the width W11 of input and output feeder line is
0.22mm, length is little to the performance impact of whole wave filter, typically can be taken as 2mm.Spacing L11=between resonator
0.375mm, L12=0.6mm, L13=0.59mm, L14=0.573mm, L15=0.59mm, L16=0.6mm, L17=
0.375mm.Cross-couplings, the wherein insertion depth Lh1=of coupling line is introduced between the 3rd resonator and the 6th resonator
1.97mm.Spacing W12=0.062mm between coupling line and the 3rd resonator.The resonator of the present embodiment is to have passed through two foldings
Step impedance resonator, resonator resonance in the mid frequency of this passband, by adjusting the characteristic impedance ratio of high bottom impedance line
Spurious response can be adjusted.W111=0.15mm, W112=0.55mm, the length of resonator is L111=8.367mm.
As shown in figure 4, the second subfilter is the general Chebyshev filters of eight ranks, mainly by incoming feeder 21, defeated
Go out feeder line 22, and resonator 23 collectively constitutes.Preferably, the width W21 of input and output feeder line is 0.22mm, and length is to whole
The performance impact of wave filter less, typically can be taken as 2mm.Spacing L21=0.9mm between resonator, L22=1.09mm, L23=
1.123mm, L24=1.124mm, L25=1.123mm, L26=1.09mm, L27=0.9mm.
As shown in figure 5, the 3rd sub- microstrip filter is the general Chebyshev filters of eight ranks, mainly by incoming feeder
31, output feeder 32, and resonator 33 collectively constitutes.Preferably, the width W31 of input and output feeder line is 0.22mm, length
Little to the performance impact of whole wave filter, typically can be taken as 2mm.Spacing L31=0.08mm between resonator, L32=
0.165mm, L33=0.08mm, L34=0.266mm, L35=0.08mm, L36=0.165mm, L37=0.08mm.
In order to simplify subfilter structure design, the preferred version of the present embodiment is the second subfilter and the 3rd son filtering
The resonator structure form of device is identical with the version of the first subfilter, can be changed humorous by the length adjusting resonator
Shake device resonant frequency so as to resonance is in the mid frequency of corresponding passband.
It is illustrated in figure 6 the result analogous diagram of triple channel high temperature superconduction wave filter, wherein S (1,1) represents return loss.
Those of ordinary skill in the art will be appreciated that, embodiment described here is to aid in reader and understands this
Bright principle is it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This area
Those of ordinary skill can make various other each without departing from present invention essence according to these technology disclosed by the invention enlightenment
Plant concrete deformation and combine, these deform and combine still within the scope of the present invention.
Claims (9)
1. more than passband high temperature superconduction wave filter, including the son filter different with the N number of frequency band being formed on substrate of high-temperature superconductor substrate
Ripple device circuit pattern, N is the integer not less than 2；It is characterized in that, the input of subfilter also includes N-1 and wherein N-1
The one-to-one three-port circulator of individual subfilter, input port second end with corresponding circulator respectively of subfilter
Mouth is connected；The first port of the 1st circulator is as filter input end；3rd port of the n-th circulator and the (n+1)th circulator
First port be connected, n is the integer being not more than N-2 not less than 1, the 3rd port of N-1 circulator and N subfilter
Input port be connected；Between the outfan of each subfilter, output is connected by matching network, circulator works in low temperature
Environment, described low temperature environment is identical with the low temperature environment of the superconducting circuit work of high temperature superconduction wave filter.
2. many passbands high temperature superconduction wave filter according to claim 1 is it is characterised in that high temperature superconduction wave filter includes three
The different subfilter circuit pattern of individual mid frequency.
3. many passbands high temperature superconduction wave filter according to claim 1 and 2 it is characterised in that subfilter outfan it
Between using microstrip circuit matching network coupling output.
4. many passbands high temperature superconduction wave filter according to claim 3 is it is characterised in that the micro-strip as matching network is electric
Road specially has the T junction of impedance mapping function.
5. many passbands high temperature superconduction wave filter according to claim 4 is it is characterised in that T junction is transmitted by Stepped Impedance
Line is constituted, and T junction length is less than quarter-wave.
6. many passbands high temperature superconduction wave filter according to claim 1 and 2 is it is characterised in that matching network is and son filter
The N-1 circulator that ripple device input is arranged symmetrically.
7. many passbands high temperature superconduction wave filter according to claim 6 is it is characterised in that the output port of subfilter divides
It is not connected with the second port of corresponding circulator；3rd port of the 1st circulator is as filter output；(n+1)th ring
3rd port of row device is connected with the first port of the n-th circulator, and n is the integer being not more than N-2 not less than 1, and N-1 goes in ring
The first port of device is connected with the output port of N subfilter.
8. the many passbands high temperature superconduction wave filter according to claim 1 or 7 it is characterised in that resonator for resonance in institute
Step impedance resonator in the mid frequency of subfilter bandwidth of operation.
9. many passbands high temperature superconduction wave filter according to claim 1 is it is characterised in that subfilter is cut for eight rank broad sense
Ratio snow husband's band filter, including eight resonators sequentially in one line, and at least draws between two non-adjacent resonators
Enter cross-couplings, the lanthanum aluminate base material that high-temperature superconductor substrate is 23.8 by dielectric constant, base material thickness is 0.5mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108110387A (en) * | 2017-11-20 | 2018-06-01 | 综艺超导科技有限公司 | A kind of high temperature superconduction wave filter of the outer high power interference of anti-band |
| CN109244610B (en) * | 2018-09-13 | 2024-05-10 | 中国电子科技集团公司第十六研究所 | Adjustable dual-mode filter |
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| US5691987A (en) * | 1994-03-31 | 1997-11-25 | Ant Nachrichtentechnik Gmbh | Frequency-channel multiplexer and demultiplexer |
| CN1588692A (en) * | 2004-09-17 | 2005-03-02 | 北京奥信通科技发展有限公司 | Method for producing high power super conductive filter |
| CN1859016A (en) * | 2005-04-30 | 2006-11-08 | 海泰超导通讯科技（天津）有限公司 | High temperature superconductive plane type group delay equalizer for radio communication |
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| CN102280677A (en) * | 2010-06-08 | 2011-12-14 | 天津海泰超导电子有限公司 | Dual-bandpass high-temperature superconducting filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203674351U (en) * | 2014-01-18 | 2014-06-25 | 成都顺为超导科技股份有限公司 | Circulator coupling multi-passband high-temperature superconductive filter |
| CN203644910U (en) * | 2014-01-18 | 2014-06-11 | 成都顺为超导科技股份有限公司 | Multi-passband high temperature superconductive filter |
-
2014
- 2014-01-18 CN CN201410023778.4A patent/CN103715479B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691987A (en) * | 1994-03-31 | 1997-11-25 | Ant Nachrichtentechnik Gmbh | Frequency-channel multiplexer and demultiplexer |
| CN1588692A (en) * | 2004-09-17 | 2005-03-02 | 北京奥信通科技发展有限公司 | Method for producing high power super conductive filter |
| CN1859016A (en) * | 2005-04-30 | 2006-11-08 | 海泰超导通讯科技（天津）有限公司 | High temperature superconductive plane type group delay equalizer for radio communication |
| CN2888663Y (en) * | 2006-04-18 | 2007-04-11 | 北京北广科技股份有限公司 | Decimeter wave multi-channel adjacent frequency power synthesizer |
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