CN103715479A - Multi-band high-temperature superconducting filter - Google Patents
Multi-band high-temperature superconducting filter Download PDFInfo
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- CN103715479A CN103715479A CN201410023778.4A CN201410023778A CN103715479A CN 103715479 A CN103715479 A CN 103715479A CN 201410023778 A CN201410023778 A CN 201410023778A CN 103715479 A CN103715479 A CN 103715479A
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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, relate to high temperature superconduction wave filter part, particularly a kind of high temperature superconduction wave filter by a plurality of subfilters a plurality of passages that form in parallel.
Background technology
Along with the development rapidly of communications industry, various communication standards exist simultaneously and make frequency resource more and more nervous, also more and more higher for the requirement of the front end receiving equipment of wireless communication system.Concrete manifestation is efficient availability of frequency spectrum problem, to having the radio-frequency filter of high selectivity, small size, low cost, flexible design, has active demand.High temperature superconductor technology development is at present comparatively ripe, and it is little that the filter that utilizes high temperature superconducting materia to design has Insertion Loss, and band edge is precipitous, and therefore the feature that squareness factor is high is widely used in the communications field.But, the cost of superconductor own is higher, and due to current technique, the size of monolithic superconductor is difficult to do cheaply in assurance large simultaneously, and the characteristics such as the small size of the components and parts in superconduction radio-frequency filter field, low cost, flexible design seem particularly important.In addition, communication system of today requires to work in a plurality of communications bands with cost-saving simultaneously, and comb filter is requisite device in these systems.For this situation, engineer begins one's study and has the filter of many band connection frequencies characteristic.
Problem based on above-mentioned many band connection frequencies of filter characteristic, current research point is mainly concentrated in the following areas: 1, utilize the bimodulus characteristic of resonator, a resonator works is two modes of resonance, corresponding a plurality of centre frequencies.The method mainly contains again two thinkings, and one is to produce many passbands by the harmonic wave utilizing and control step resonator, and another is by load short circuit or the method for open circuit minor matters on uniform impedance resonator or non-homogeneous electric impedance resonator.The advantage of this technology is small volume, but design difficulty is large.A plurality of passbands are used same set of coupling network, be difficult to reach the needed coupling coefficient of each passband simultaneously, therefore be difficult to regulate respectively the bandwidth of each passband, consult patent documentation and periodical literature, that utilizes this kind of method all can only design two-stage or the filter of three grades, the design of filter of having relatively high expectations for progression is very difficult, is therefore difficult to design high performance broadband multiband filter.2, bandpass and band-rejection filter has been integrated to the design of multi-channel filter.The shortcoming of the method is that volume is larger, and design is complicated, debug difficulties.3, a plurality of subfilters scheme in parallel.Use a plurality of subfilters to realize multifrequency band-pass filter, each subfilter realizes respectively a passage.But because the coupling network design difficulty of subfilter is large, design to such an extent that filter volume is large, a lot of engineers have just abandoned this idea.
Summary of the invention
The object of the invention is to form in order to solve a plurality of subfilters of existing employing the deficiency that in the design of comb filter, coupling network design difficulty is large and device volume is large, proposed a kind of many passbands high temperature superconduction wave filter.
Technical scheme of the present invention is: many passbands high temperature superconduction wave filter, comprise the subfilter circuit pattern that high-temperature superconductor substrate is different with being formed at an on-chip N frequency band, and N is not less than 2 integer; It is characterized in that, the input of subfilter also comprises N-1 and N-1 subfilter wherein three-port circulator one to one, and the input port of subfilter is connected with the second port of corresponding circulator respectively; The first port of the 1st circulator is as filter input end; The 3rd port of n circulator is connected with the first port of n+1 circulator, and n is not less than 1 integer that is not more than N-2, and the 3rd port of N-1 circulator is connected with the input port of N subfilter; Between the output of each subfilter, by matching network, connect output.
The circulator using under normal temperature in general in liquid nitrogen temperature to using because of Insertion Loss excessive (being conventionally greater than 3dB) between liquid helium warm area, although can effectively reduce circuit size while being applied to the filter based on high temperature superconducting materia, can not guarantee the overall performance as high temperature superconduction wave filter; Even when for circuit loss being controlled to the engineering field have relatively high expectations such as during communication base station, such scheme cannot be realized its parameter request substantially, in order to solve the problems of the technologies described above, the present invention further proposes following improvement project: described circulator be while working in liquid nitrogen to liquid helium warm area Insertion Loss not higher than the cryogenic circulator of 0.3dB.
Above-mentioned cryogenic circulator works in low temperature environment, and it is identical with the low temperature environment of the superconducting circuit work of high temperature superconduction wave filter that described low temperature environment is preferably.
Preferably, above-mentioned high temperature superconduction wave filter comprises three subfilter circuit patterns that centre frequency is different.
Further, between subfilter output, adopt the output of microstrip circuit matching network coupling.
Further, the above-mentioned microstrip circuit as matching network is specially the T-shaped knot with impedance transformation function.
Further, above-mentioned T-shaped knot consists of Stepped Impedance transmission line, and T-shaped knot length is less than quarter-wave.
Further, above-mentioned matching network is N-1 the circulator being arranged symmetrically with subfilter input.
Further, the output port of subfilter is connected with the second port of corresponding circulator respectively; The 3rd port of the 1st circulator is as filter output; The 3rd port of n+1 circulator is connected with the first port of n circulator, and n is not less than 1 integer that is not more than N-2, and the first port of N-1 circulator is connected with the output port of N subfilter.
Further, resonator is that resonance is in the Stepped Impedance resonator of the centre frequency of place subfilter bandwidth of operation.
Further, subfilter is eight rank generalized chebyshev band pass filters, comprises eight sequentially resonators in one line, and at least between two non-adjacent resonators, introduces cross-couplings.
Further, the lanthanum aluminate base material that high-temperature superconductor substrate is 23.8 by dielectric constant, base material thickness is 0.5mm.
Beneficial effect of the present invention: many passbands high temperature superconduction wave filter of the present invention adopts high temperature superconducting materia to design high performance multichannel high temperature superconduction wave filter.What adopt is a plurality of subfilters schemes in parallel, has overcome the problem of inputting coupling network complexity, difficult design.Adopted the resonator of miniaturization, under the prerequisite meeting design requirement, the volume of filter reduces greatly simultaneously.And having met the filtering requirements of a plurality of frequency band signals simultaneously, Out-of-band rejection degree is high, has overcome and between subfilter, has mated difficult problem, compact conformation, flexible design.Particularly adopt the scheme of the cryogenic circulator of filter with low insertion loss under liquid helium or liquid nitrogen temperature, the insertion loss of circulator is obviously reduced, promoted the overall performance of the multichannel high temperature superconduction wave filter of the present invention.
Accompanying drawing explanation:
Fig. 1 is the high temperature superconduction wave filter system block diagram of a kind of three passbands of the present invention;
Fig. 2 is the high temperature superconduction wave filter embodiment structural representation of a kind of three passbands of the present invention;
Fig. 3 is the first subfilter structural representation of high temperature superconduction wave filter embodiment illustrated in fig. 2;
Fig. 4 is the second subfilter structural representation of high temperature superconduction wave filter embodiment illustrated in fig. 2;
Fig. 5 is the 3rd subfilter structural representation of high temperature superconduction wave filter 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.
Embodiment
Embodiments of the invention are according to principle of the present invention and designing, and below in conjunction with accompanying drawing and following specific embodiment, the invention will be further elaborated.
As shown in Figure 1, many passbands high temperature superconduction wave filter, comprises the subfilter circuit pattern 2 that high-temperature superconductor substrate is different with being formed at an on-chip N frequency band, and N is not less than 2 integer; The input of subfilter also comprises N-1 and N-1 subfilter wherein three-port circulator one to one, and the input port of subfilter is connected with the second port of corresponding circulator respectively; The first port of the 1st circulator is as filter input end; The 3rd port of n circulator is connected with the first port of n+1 circulator, and n is not less than 1 integer that is not more than N-2, and the 3rd port of N-1 circulator is connected with the input port of N subfilter; The N-1 of input circulator forms input matching network 1 and replaced traditional input match circuit.Because input match circuit difficult design and circuit scale are larger conventionally.Therefore adopt the design of the present embodiment effectively to reduce design difficulty and reduced the overall dimensions of device.Between the output of each subfilter, by matching network, connect output.The three passband high temperature superconduction wave filters shown in Fig. 1 of take are example, specific implementation principle of the present invention is as follows: input signal is from the first port input of circulator 1, through the second port output, the signal that meets the design frequency band of filter 1 in output signal enters output matching network 3 after filter 1; The filtered device 1 of all the other signals is reflected back the second port of circulator 1 and through the 3rd port, is input to the first port of circulator 2, signal is further exported from filter 2 through the second port of circulator 2, under the effect of filter 2, the signal that meets its frequency band exports output matching network to; All the other signals after filter 2 reflection successively the second port, the 3rd port through circulator 2 export filter 3 to, and export the signal that meets its frequency band to output matching network by filter 3.Preferably, above-mentioned high temperature superconduction wave filter comprises three subfilter circuit patterns that centre frequency is different.Due to the circulator conventionally using at normal temperatures in liquid nitrogen temperature to using because of Insertion Loss excessive (being conventionally greater than 3dB) between liquid helium warm area, although can effectively reduce circuit size while being applied to the filter based on high temperature superconducting materia, can not guarantee the overall performance as high temperature superconduction wave filter; Even when for circuit loss being controlled to the engineering field have relatively high expectations such as during communication base station, such scheme cannot be realized its parameter request substantially, in order to solve the problems of the technologies described above, the present embodiment further proposes following improvement project: described circulator be while working in liquid nitrogen to liquid helium warm area Insertion Loss not higher than the cryogenic circulator of 0.3dB.It should be noted that, above-mentioned cryogenic circulator is because structurally to there is no essence different from conventional circulator, and difference is only to have used the better Ferrite Material of temperature coefficient of electromagnetic parameter.Concrete, the temperature coefficient that above-mentioned Ferrite Material meets electromagnetic parameter when liquid nitrogen and/or liquid helium warm area be not less than its at normal temperatures 30%.Because the selection of above-mentioned material belongs to common practise for the person of ordinary skill of the art, therefore using the technical scheme of the described cryogenic circulator that above-mentioned material makes is also clearly.
In addition; above-mentioned comprise work in liquid nitrogen to liquid helium warm area Insertion Loss not higher than the parameter setting of the filter scheme of the cryogenic circulator of 0.3dB; mainly because be applied to the needs of the concrete engineering problem of receiver front end; but filter of the present invention is not limited in the application of receiver front end, therefore above-mentioned design parameter does not form limiting the scope of the invention.Such as, according to the above-mentioned Insertion Loss value of different engineering fields, can relax to 0.5dB or 1dB.
At the output of above-mentioned filter, matching network can adopt the output of microstrip circuit matching network.Concrete, the above-mentioned microstrip circuit as matching network is specially the T-shaped knot with impedance transformation function.T-shaped knot consists of Stepped Impedance transmission line, and T-shaped knot length is less than quarter-wave.By T-shaped knot, carry out impedance matching, the filter characteristic of three passages is not interfere with each other.
The Circuit Matching network adopting due to output has difficult design and the large deficiency of size equally, therefore in order to improve the overall performance of circuit, preferably at output, also adopts circulator matching network.Be specially N-1 the circulator being arranged symmetrically with subfilter input.The output port of subfilter is connected with the second port of corresponding circulator respectively; The 3rd port of the 1st circulator is as filter output; The 3rd port of n+1 circulator is connected with the first port of n circulator, and n is not less than 1 integer that is not more than N-2, and the first port of N-1 circulator is connected with the output port of N subfilter.
Above-mentioned resonator is resonance in the Stepped Impedance resonator of the centre frequency of place subfilter bandwidth of operation.
As shown in Figures 2 to 5, subfilter is eight rank generalized chebyshev band pass filters, comprises eight sequentially resonators in one line, and at least between two non-adjacent resonators, introduces cross-couplings.The lanthanum aluminate base material that high-temperature superconductor substrate is 23.8 by dielectric constant and be formed at the yittrium oxide barium copper high-temperature superconducting thin film that the thickness on base material is 500nm and form, base material thickness is 0.5mm.
As shown in Figures 2 and 3, the first subfilter is the generalized chebyshev filter on eight rank, and mainly by incoming feeder 11, output feeder 12, have the transmission line that non-adjacent resonator is electrically connected, and resonator forms jointly.By transmission line, introduce cross-couplings, added transmission zero, improved the Out-of-band rejection degree of filter.Eight resonators are yi word pattern and arrange, and the spacing between each resonator determines by the characteristic of filter, and incoming feeder and output feeder and resonator are directly electrically connected, and its access point position is relevant with impedance matching.In this specific embodiments, the width W 11 of input and output feeder line is 0.22mm, and length is little to the performance impact of whole filter, generally can be taken as 2mm.Spacing L11=0.375mm between resonator, L12=0.6mm, L13=0.59mm, L14=0.573mm, L15=0.59mm, L16=0.6mm, L17=0.375mm.Between the 3rd resonator and the 6th resonator, introduce cross-couplings, wherein the insertion depth Lh1=1.97mm of coupling line.Spacing W12=0.062mm between coupling line and the 3rd resonator.The resonator of the present embodiment is the Stepped Impedance resonator that has passed through two foldings, and resonator resonance, in the centre frequency of this passband, can be adjusted spurious response by adjusting the characteristic impedance ratio of impedance line of the high end.W111=0.15mm, W112=0.55mm, the length of resonator is L111=8.367mm.
As shown in Figure 4, the second subfilter is the generalized chebyshev filter on eight rank, mainly by incoming feeder 21, and output feeder 22, and resonator 2 forms jointly.Preferably, the width W 21 of input and output feeder line is 0.22mm, and length is little to the performance impact of whole filter, generally 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 generalized chebyshev filter on eight rank, mainly by incoming feeder 31, and output feeder 32, and resonator 33 forms jointly.Preferably, the width W 31 of input and output feeder line is 0.22mm, and length is little to the performance impact of whole filter, generally 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 structural design, the preferred version of the present embodiment is that the second subfilter is identical with the version of the first subfilter with the resonator structure form of the 3rd subfilter, by regulating the length of resonator can change the resonance frequency of resonator, make its resonance in the centre frequency of corresponding passband.
Be illustrated in figure 6 the result analogous diagram of triple channel high temperature superconduction wave filter, S(1 wherein, 1) represent return loss.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (10)
1. more than passband high temperature superconduction wave filter, comprises the subfilter circuit pattern that high-temperature superconductor substrate is different with being formed at an on-chip N frequency band, and N is not less than 2 integer; It is characterized in that, the input of subfilter also comprises N-1 and N-1 subfilter wherein three-port circulator one to one, and the input port of subfilter is connected with the second port of corresponding circulator respectively; The first port of the 1st circulator is as filter input end; The 3rd port of n circulator is connected with the first port of n+1 circulator, and n is not less than 1 integer that is not more than N-2, and the 3rd port of N-1 circulator is connected with the input port of N subfilter; Between the output of each subfilter, by matching network, connect output.
2. many passbands high temperature superconduction wave filter according to claim 1, it is characterized in that, described circulator be while working in liquid nitrogen to liquid helium warm area Insertion Loss not higher than the cryogenic circulator of 0.3dB, described cryogenic circulator works in low temperature environment, and described low temperature environment is identical with the low temperature environment of the superconducting circuit work of high temperature superconduction wave filter.
3. many passbands high temperature superconduction wave filter according to claim 1, is characterized in that, high temperature superconduction wave filter comprises three subfilter circuit patterns that centre frequency is different.
4. according to the many passbands high temperature superconduction wave filter described in any one claim of claims 1 to 3, it is characterized in that, between subfilter output, adopt the output of microstrip circuit matching network coupling.
5. many passbands high temperature superconduction wave filter according to claim 4, is characterized in that, the microstrip circuit that is used as matching network is specially the T-shaped knot with impedance transformation function.
6. many passbands high temperature superconduction wave filter according to claim 5, is characterized in that, T-shaped knot consists of Stepped Impedance transmission line, and T-shaped knot length is less than quarter-wave.
7. according to the many passbands high temperature superconduction wave filter described in any one claim of claims 1 to 3, it is characterized in that, matching network is N-1 the circulator being arranged symmetrically with subfilter input.
8. many passbands high temperature superconduction wave filter according to claim 7, is characterized in that, the output port of subfilter is connected with the second port of corresponding circulator respectively; The 3rd port of the 1st circulator is as filter output; The 3rd port of n+1 circulator is connected with the first port of n circulator, and n is not less than 1 integer that is not more than N-2, and the first port of N-1 circulator is connected with the output port of N subfilter.
9. according to the many passbands high temperature superconduction wave filter described in any one claim of claim 1 to 8, it is characterized in that, resonator is that resonance is in the Stepped Impedance resonator of the centre frequency of place subfilter bandwidth of operation.
10. many passbands high temperature superconduction wave filter according to claim 1, it is characterized in that, subfilter is eight rank generalized chebyshev band pass filters, comprise eight sequentially resonators in one line, and at least between two non-adjacent resonators, introduce 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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| 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 |
| CN109244610A (en) * | 2018-09-13 | 2019-01-18 | 中国电子科技集团公司第十六研究所 | A kind of adjustable dual mode filter |
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