CN102868012B - High-temperature superconductive micro-strip resonator and filter containing same - Google Patents
High-temperature superconductive micro-strip resonator and filter containing same Download PDFInfo
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Abstract
The invention relates to a high-temperature superconductive micro-strip resonator and a filter containing the resonator. The resonator is in a separation phase step structure and is formed by embedding and connecting a high-impedance line in a mirror symmetry open ring structure and two low-impedance lines in the mirror symmetry open ring structure; and a high-temperature superconductive filter is formed by an input micro-strip line, an output micro-strip line and a plurality of the micro-strip resonators in the separation phase step structure. The resonator with the separation phase step structure is used as a slow wave structure and can effectively reduce the size of the resonator; the structure is relatively compact and the adjacent coupling strength under the same distance is weakened; meanwhile, an impedance relative ratio between the high-impedance line and the low-impedance lines is adjusted and the position of a spurious pass-band is effectively controlled; and the filter also has the advantages that the inserting loss in the high-temperature superconductive filter is small, the outer-band inhibition is good, a band edge is abrupt, the pass-band is narrow and the like. The high-temperature superconductive micro-strip resonator can be used for a high-temperature superconductive filter circuit which has the advantages of narrow passband, wide resistance band and miniaturization.
Description
Technical field
The invention belongs to microwave engineering field, relating to a kind of splitting Stepped Impedance structured high temperature superconducting microstrip resonator being applicable to microwave communication and detection and the filter be made up of it, is a kind of microwave passive component.
Background technology
Due to low temperature low resistance characteristic, the microwave resonator that high-temperature superconducting thin film makes has very high nonloaded Q (> 10000) usually.And for the filter of certain joint number and relative bandwidth, its Insertion Loss is inversely proportional to the nonloaded Q of resonator, and therefore high temperature superconduction wave filter has Insertion Loss in very low band usually.Meanwhile, owing to can introduce higher filter joint number, high temperature superconduction wave filter can have higher band edge steepness and Out-of-band rejection.Based on these advantages, high temperature superconduction wave filter can be widely used in the fields such as microwave communication, astronomical observation and radar detection.
At present, mainly concentrate on the aspects such as the filter with low insertion loss of first pass-band, high band edge steepness and high out-of-side rejection for the document of high temperature superconduction wave filter and patent, and special still few for the research of high temperature superconduction wave filter parasitic passband.In fact, people have proposed multiple parasitic band suppression scheme for common metal filter, but are not often suitable for super conductive filter.The two difference mainly contains following aspect: the high q-factor of (1) high temperature superconduction wave filter, makes its high-frequency parasitic passband as common metal, can not be decayed many by own loss; (2) there is the feature of ground connection difficulty in high temperature superconduction wave filter, because the high-temperature superconductor substrate ground connection drilling technology of the media such as the lanthanum aluminate adopted, magnesium oxide and sapphire is difficult to realize, and 1/4 wave resonator can only remove the parasitic passband at even number frequency multiplication place; (3) the parasitic band suppression method of conventional microstrip filter employing, the resonator dimensions of general employing is larger, and be only suitable for the lower situation of joint number, and super conductive filter is limited to the size (maximum 3 inches) of thin-film material, and General Requirements is generalized to the design of high joint number; (4), in low frequency situation, the size of resonator own is comparatively large, too increases the difficulty of design.
Based on above consideration, Stepped Impedance structure is incorporated in the design of high temperature superconduction wave filter by people, and the design of current several typical Stepped Impedance is as follows:
Fig. 1 is typical step impedance resonator (stepped impedance resonator, SIR) band pass filter (Bandpass filter) formed, please refer to D.C.Chung and B.S.Han, " HTS Microstrip Filters using H-Type Resonators ", IEEETRANSACTIONS APPLIED SUPERCONDUCTIVITY, VOL.11, pp.388.Effective electrical length of each resonator is half-wavelength, and the magnetic field of this resonator mainly concentrates on the high impedance line in the middle of resonator, and electric field then mainly concentrates on the low-impedance line at two ends.The overall wire length of this resonator is comparatively large, and stiffness of coupling between resonator is comparatively strong, and be applicable to the filter making broadband, if make narrow band filter, then volume is larger.When needing stopband outside wider band, that tries one's best to make the first parasitic passband shifts to high frequency, needs higher height impedance ratio; But consider actual processing technology precision, high impedance line is usually unsuitable meticulous, and the meticulous resonator q that also can cause reduces.Therefore, the raising of the impedance ratio of this SIR structure can be restricted, and wherein 10 is the parallel coupling mode filter that typical step impedance resonator is formed, and 11 is coupled resonators, and 12 input micro-band for signal, and 13 export micro-band for signal.
Fig. 2 is Open loop step electric impedance resonator (the Open-looped Stepped Impedance Resonator improved on accompanying drawing 1 basis, OLSIR) filter formed, please refer to S.Jin, B.Wei, X.Zhang, et al, " Design of a novel HTS open-loop SIR filter with the relocation of its second passband ", Microwae and Optical Technology letters, VOL.11, pp.2097-2101.Compared with common SIR, this resonator bends on the whole, and size reduces.Wherein, in order to reduce stiffness of coupling, fold in high impedance alignment larger for distributed current densities, and the stronger low-impedance line of electric field is centered around outside, such adjacent coupled can make resonator spacing reduce because electric coupling plays a major role.But still can run into the problem that height impedance ratio is limited, wherein 20 filters formed for Open loop step electric impedance resonator, 21 is Open loop step electric impedance resonator, 22 input micro-band for signal, 23 export micro-band for signal, 24 is the opening of Open loop step electric impedance resonator, the bending part of 25 Open loop step electric impedance resonators.
Accompanying drawing 3 is filters that the splitting step impedance resonator (Bandpass filter) further developed on Open loop step electric impedance resonator basis is formed, please refer to S.Jin, B.Wei, X.Zhang, et al, " A compact narrowband HTS filter with an extended upper stopband ", Microwae and Optical Technology letters, VOL.50, pp.1066-1069.Wherein 31 for splitting Stepped Impedance structure resonator, and 32 input micro-band for signal, and 33 export micro-band, the opening of 34 splitting Stepped Impedance structure resonator for signal, and 35 is the foldable structure of splitting Stepped Impedance structure resonator.The low-impedance line splitting at SIR two ends is two sections of low-impedance lines in parallel by this resonator, and therefore equiva lent impedance is the half of every section of low-impedance line.This resonator can obtain the impedance ratio higher than first two, therefore can obtain wider stopband, but Open loop step electric impedance resonator in structure in relative Fig. 2 is comparatively large, and overlap joint limited space when constrained input feeder line adopts direct-coupling,
Summary of the invention
The object of the invention is to the above-mentioned deficiency overcoming prior art, provide a kind of high temperature super conductive microstrip resonator, this resonator is splitting Stepped Impedance structure, is applicable to the resonator structure of the Wide stop bands of high temperature superconduction wave filter, miniaturization, weak coupling intensity.
Another object of the present invention is to provide the filter comprising above-mentioned splitting Stepped Impedance structured high temperature superconducting microstrip resonator.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A kind of high temperature super conductive microstrip resonator, connected and composed by a high impedance line and two low-impedance lines, high impedance line adopts specular open loop structure, article two, low-impedance line adopts the open loop structure of mirror image each other, and adopt nested structure between high impedance line and two low-impedance lines, namely two low-impedance lines embed the inside of high impedance line from the opening part of high impedance line.
In above-mentioned high temperature super conductive microstrip resonator, two ports of high impedance line are relative, and two low-impedance lines, two ports are separately relative.
In above-mentioned high temperature super conductive microstrip resonator, high impedance line is rectangular symmetrical open loop structure or circular symmetric open loop structure.
In above-mentioned high temperature super conductive microstrip resonator, two low-impedance lines are rectangle open loop structure or annular open loop structure, and two low-impedance lines are symmetrical structure or unsymmetric structure separately.
In above-mentioned high temperature super conductive microstrip resonator, by adjusting the width of a described high impedance line and two low-impedance lines respectively, reach the object of adjustment resonator height impedance ratio.
A kind of filter, comprise the high temperature super conductive microstrip resonator described in n claim 1 or 2, input microstrip line and export microstrip line, described input microstrip line and export microstrip line separately and the most contiguous high temperature super conductive microstrip resonator be direct-drive relation or coupling excitation relation, wherein n is positive integer, and n >=2.
In above-mentioned filter, n high temperature super conductive microstrip resonator is arranged in parallel successively, and the upper-lower position of each resonator can be concordant with adjacent resonators, also can not be concordant.
In above-mentioned filter, n high temperature super conductive microstrip resonator can be same direction, can be also different directions, and can be arranged in overall is rotational symmetry structure, and also can be arranged in overall is linear symmetric structure.
In above-mentioned filter, filter bandwidht is wider, n high temperature super conductive microstrip resonator clearance distance narrower.
In above-mentioned filter, filter adopts metallic film or high-temperature superconducting thin film to make.
The present invention compared with prior art has following beneficial effect:
(1) the present invention has carried out innovative design to high temperature super conductive microstrip resonator structure, resonator is connected and composed by a high impedance line and two low-impedance lines, for splitting Stepped Impedance structure, high impedance line adopts specular open loop structure, article two, low-impedance line adopts the open loop structure of mirror image each other, and adopts nested structure between high impedance line and low-impedance line.This structural design can reduce the size of resonator greatly, makes filter construction compacter; Because electric current mainly concentrates on the mid portion of high impedance line, i.e. the bottom of resonator, makes the magnetic coupling between adjacent resonators significantly reduce, and then has very weak adjacent coupled intensity, is applicable to the design of narrow band filter;
(2) splitting Stepped Impedance structure resonator of the present invention develops based on SIR resonator, by adjustment height impedance ratio, can change it flexibly and form parasitic passband the offseting relative to first pass-band of filter, what realize parasitic path position adjustablely to maintain in high temperature superconduction wave filter band that Insertion Loss is little, Out-of-band rejection good, band edge is precipitous and the advantage such as passband is narrow in addition;
(3) splitting Stepped Impedance structure resonator of the present invention can avoid the ground connection difficulty in process problem of high temperature superconduction wave filter ceramic substrate, by increasing the impedance relative scale between high low-impedance line, can the frequency range relative position of the more effective raising parasitic passband of relatively traditional SIR filter, be specially adapted to the high temperature superconduction wave filter needing high parasitic passband;
(4) filter that forms of splitting Stepped Impedance structure resonator of the present invention input microstrip line, to export microstrip line can be direct-drive relation with the most contiguous splitting step structure micro-strip resonantor separately, also can be coupling excitation relation, can be arranged in overall is rotational symmetry structure, also can be arranged in overall is linear symmetric structure, resonator can be same direction, also can be a different direction, version be versatile and flexible, can meet various different demand.
Accompanying drawing explanation
Fig. 1 is existing typical half-wavelength step impedance resonator parallel coupling mode filter structural representation;
Fig. 2 is the filter construction schematic diagram that existing Open loop step electric impedance resonator is formed;
Fig. 3 is the filter construction schematic diagram that existing splitting step impedance resonator is formed;
Fig. 4 is the structural representation of high temperature super conductive microstrip resonator of the present invention;
4 rank filter construction schematic diagrames of the input and output employing direct-drive that Fig. 5 is formed for high temperature super conductive microstrip resonator of the present invention;
4 rank filter construction schematic diagrames of the input and output employing coupling excitation that Fig. 6 is formed for high temperature super conductive microstrip resonator of the present invention;
Fig. 7 is the narrow band frequency characteristic curve of direct-drive type 4 rank splitting Stepped Impedance Structure Filter of the present invention;
Fig. 8 is the wide band frequency characteristics curve of direct-drive type 4 rank splitting Stepped Impedance Structure Filter of the present invention;
Wherein: 40 is splitting Stepped Impedance structure resonator, and 41 is symmetrical open loop high impedance line, and 42a, 42b are the open loop low-impedance line of mirror image each other, and 43a, 43b are two ports of open loop low-impedance line; 44a, 44b are two ports of open loop high impedance line; 50 for direct-drive type 4 rank filter, and 51 input micro-band for signal, and 52 export micro-band for signal, and 53 is the gap between adjacent resonators; 60 is coupling excitation type 4 rank filters, and 61 input micro-band for signal, and 62 export micro-band for signal, and 63 is the gap between adjacent resonators.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Be illustrated in figure 4 the structural representation of high temperature super conductive microstrip resonator of the present invention, high temperature super conductive microstrip resonator of the present invention is connected and composed by a high impedance line and two low-impedance lines as seen from the figure, for splitting Stepped Impedance structure, high impedance line 41 adopts specular open loop structure, article two, low-impedance line 42a, 42b adopts the open loop structure of mirror image each other, and high impedance line 41 and two low-impedance line 42a, nested structure is adopted between 42b, i.e. two low-impedance line 42a, 42b embeds the inside of high impedance line 41 from the opening part of high impedance line 41, at two low-impedance line 42a, gap is left between 42b.
Two ports 44a, 44b of high impedance line 41 are relative, and two low-impedance line 42a, 42b two ports 43a, 43b are separately positioned at the homonymy of resonator, and two low-impedance line 42a, 42b two ports 43a, 43b are separately relative respectively.
In addition high impedance line 41 is rectangular symmetrical open loop structure or circular symmetric open loop structure, gives the example of rectangular symmetrical open loop structure in Fig. 4.Article two, low-impedance line 42a, 42b are rectangle open loop structure or annular open loop structure, and two low-impedance lines 42a, 42b are symmetrical structure or unsymmetric structure separately, give low-impedance line 42a, 42b of unsymmetric structure in Fig. 4.The open loop structure that high impedance line 41 and two low-impedance lines 42a, 42b also can meet the demands for other.
Filter of the present invention is made up of a said n splitting Stepped Impedance structured high temperature superconducting microstrip resonator 40, input microstrip line and output microstrip line, input microstrip line and export microstrip line separately and the most contiguous high temperature super conductive microstrip resonator be direct-drive relation or coupling excitation relation, wherein n >=2.
In filter, splitting step structure micro-strip resonantor 40 is arranged in parallel successively, the mode of its resonator can alternatively up and down, can be same direction, also can be a different direction, can be arranged in overall is rotational symmetry structure, and also can be arranged in overall is linear symmetric structure.
Splitting type Stepped Impedance structure resonator 40 in filter is time arranged in parallel, and the upper-lower position of resonator can be concordant with adjacent resonators, also can not be concordant.
Filter available metal film makes, and the high-temperature superconducting thin film of high-quality-factor also can be used to make, and metallic film can be Au, Ag, Cu, Al, and high-temperature superconducting thin film can be YBCO, TBCCO.And filter bandwidht is wider, the clearance distance in filter between n high temperature super conductive microstrip resonator is narrower.
Embodiment 1
Be illustrated in figure 54 rank filter construction schematic diagrames of the input and output employing direct-drive that high temperature super conductive microstrip resonator of the present invention is formed, filter 50 by the micro-band 51 of input, export micro-band 52 and four splitting Stepped Impedance structure micro-strip resonantors 40 are formed, four splitting Stepped Impedance structure micro-strip resonantors 40 are arranged in parallel successively, and be same direction, being arranged in overall is linear symmetric structure.Gap 53 between resonator 40 is determined by filter bandwidht, and gap 53 distance is inversely proportional to filter bandwidht.Input microstrip line 51 is connected with the most contiguous high temperature super conductive microstrip resonator separately with output microstrip line 52, forms direct-drive relation.
Be illustrated in figure 7 the narrow band frequency characteristic curve of direct-drive type 4 rank splitting Stepped Impedance Structure Filter of the present invention, in figure, 71 is the frequency response S11 curve of filter, 72 is the frequency response S21 curve of filter, first pass-band relative bandwidth is 2.4% as seen from the figure, and band internal reflection loss is better than-19dB.
Be illustrated in figure 8 the wide band frequency characteristics curve of direct-drive type 4 rank splitting Stepped Impedance Structure Filter of the present invention, in figure, 81 is the baseband response S21 curve of filter, 82 is the first parasitic passband frequency response S21 curve of filter, first parasitic passband is positioned at the position of three times of fundamental frequencies as seen from the figure, and Out-of-band rejection is better than 60dB.
Embodiment 2
Be illustrated in figure 64 rank filter construction schematic diagrames of the input and output employing coupling excitation that high temperature super conductive microstrip resonator of the present invention is formed, filter 60 by the micro-band 61 of input, export micro-band 62 and four splitting Stepped Impedance structure micro-strip resonantors 40 are formed, four splitting Stepped Impedance structure micro-strip resonantors 40 are arranged in parallel successively, and be same direction, being arranged in overall is linear symmetric structure.Gap 63 between resonator 40 is determined by filter bandwidht, and gap 63 distance is inversely proportional to filter bandwidht.Input microstrip line 61 and the high temperature super conductive microstrip resonator exporting microstrip line 62 respective and the most contiguous adopt non-overlapping form, form coupling excitation relation.
Embodiment 2 adopts coupling excitation to design, its design result is substantially the same manner as Example 1, the main distinction is that the feeder line of embodiment 2 and first segment resonator are owing to having more weak stiffness of coupling, is mainly applicable to arrowband design, and embodiment 1 is not only applicable to arrowband and is applicable to the Wide-Band Design yet.
Resonator of the present invention adopts splitting Stepped Impedance structure, the high temperature superconduction wave filter be made up of it has compact volume, adjustable parasitic passband and the outer stopband of wider band, the high-temperature superconducting thin film that applicable use has high-quality-factor makes high temperature superconduction wave filter.
The above; be only the embodiment of the best of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
The content be not described in detail in specification of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (7)
1. a high temperature super conductive microstrip resonator, it is characterized in that: connected and composed by a high impedance line and two low-impedance lines, high impedance line (41) adopts specular open loop structure, article two, low-impedance line (42a, 42b) adopts the open loop structure of mirror image each other, and adopt nested structure between high impedance line (41) and two low-impedance lines (42a, 42b), namely two low-impedance lines (42a, 42b) embed the inside of high impedance line (41) from the opening part of high impedance line (41);
Two ports (44a, 44b) of described high impedance line (41) are relative, and two ports (43a, 43b) that two low-impedance lines (42a, 42b) are respective are relative; Described high impedance line (41) is rectangular symmetrical open loop structure or circular symmetric open loop structure; Described two low-impedance lines (42a, 42b) are rectangle open loop structure or annular open loop structure, and two low-impedance lines (42a, 42b) are symmetrical structure or unsymmetric structure separately.
2. a kind of high temperature super conductive microstrip resonator according to claim 1, is characterized in that: by adjusting the width of a described high impedance line and two low-impedance lines respectively, reaches the object of adjustment resonator height impedance ratio.
3. a filter, it is characterized in that: comprise the high temperature super conductive microstrip resonator described in n claim 1 or 2, input microstrip line and export microstrip line, described input microstrip line and export microstrip line separately and the most contiguous high temperature super conductive microstrip resonator be direct-drive relation or coupling excitation relation, wherein n is positive integer, and n >=2.
4. a kind of filter according to claim 3, is characterized in that: a described n high temperature super conductive microstrip resonator is arranged in parallel successively, and the upper-lower position of each resonator can be concordant with adjacent resonators, also can not be concordant.
5. a kind of filter according to claim 3, it is characterized in that: a described n high temperature super conductive microstrip resonator can be same direction, also can be different directions, can be arranged in overall be rotational symmetry structure, and also can be arranged in overall is linear symmetric structure.
6. a kind of filter according to claim 3, is characterized in that: described filter bandwidht is wider, the clearance distance between n high temperature super conductive microstrip resonator is narrower.
7. a kind of filter according to claim 3, is characterized in that: described filter adopts metallic film or high-temperature superconducting thin film to make.
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| CN105932375A (en) * | 2016-05-13 | 2016-09-07 | 电子科技大学 | W-band high-temperature superconducting plane filter and bandwidth and external Q value adjustment method therefor |
| CN107272260B (en) | 2017-07-19 | 2020-04-21 | 京东方科技集团股份有限公司 | Backlight lamp strip, backlight module and display device |
| CN117477195A (en) * | 2023-12-27 | 2024-01-30 | 成都宏科电子科技有限公司 | Broadband parallel coupling filter for inhibiting 2-frequency multiplication harmonic wave |
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