CN101546854B - Coupling method of microstrip filter and microstrip resonator thereof - Google Patents
Coupling method of microstrip filter and microstrip resonator thereof Download PDFInfo
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Abstract
The invention relates to a coupling method of a microstrip filter and a microstrip resonator thereof. The resonator comprises a group of finger-inserting capacitors comprising microstrips, a group of double-helix curved inductors and a group of blocky capacitors formed with ground, wherein the microstrip comprises an upper-layer superconducting film, a lower-layer superconducting film and an artificial monocrystal medium positioned between the upper-layer and the lower-layer superconducting films; the finger-inserting capacitors are connected in parallel with the double-helix curved inductors, and the finger-inserting capacitors and the double-helix curved inductors connected in parallel are serially connected with the blocky capacitors; a line in the finger-inserting capacitors of the first resonator, which has the same charge polarity with an outermost line of the finger-inserting capacitor of the second resonator is shortened or cut off completely; and the outermost line of the finger-inserting capacitors of the second resonator is elongated and bent, extends into a line shortened or cut off completely in the finger-inserting capacitors of the first resonator and is coupled with two adjacent lines in the finger-inserting capacitors of the first resonator. The filter has less insertion loss, large out-band rejection, high band-edge gradient and good group delay performance.
Description
Technical field
The invention belongs to the microwave engineering field, specifically, the present invention relates to a kind of microstrip bandpass filter, resonator and coupling process thereof that is made by high-temperature superconducting thin film.
Background technology
In the microwave engineering; Superconducting microstrip resonator can be formed the flat superconducting filter (a kind of passive device) of different rank; Use is used for selecting the signal of certain frequency in various microwave devices (like radar, mobile telephone base station, microwave communication device, radio astronomical telescope etc.).At the front end of various microwave receiving systems, often use filter to suppress signal frequency not, the signal frequency that needs is passed through smoothly.High temperature superconduction wave filter is a kind of planar device of processing with high temperature superconducting materia, it by several planar resonator by certain regularly arranged forming.For the band pass filter of manufacturing with common metal, relative bandwidth just is being narrow band filter below 5% usually.The relative bandwidth of high temperature superconduction wave filter can be worth little a lot than this, also compares difficulty but relative bandwidth is less than 0.5%, and reason is the interference of parasitic couplings.Relevant theory is pointed out: the coupling coefficient between the resonator should satisfy following relationship
M in the formula
IjIt is the coupling coefficient between i resonator and j the resonator; FBW is a relative bandwidth, defines its ratio for passband width and centre frequency; G is a normalization electric capacity; J is a characteristic admittance.This formula shows that coupling coefficient M depends on relative bandwidth, also depends on the character of resonator self.Obviously, be that normalization electric capacity g or characteristic admittance J should be closely related with the geometry of planar resonator self.The coupling of two adjacent resonators generations is called adjacent coupled in filter, and this coupling is necessary.But also have coupling between non-conterminous two resonators, this type coupling might cause adverse effect to Filter Design, and this harmful non-adjacent coupled is exactly parasitic couplings (parasitical coupling).When carrying out the design of broadband flat superconducting filter, the parasitic couplings between the resonant element can be ignored.But the situation of arrowband flat superconducting filter is then different fully, and parasitic couplings has often caused destructive interference, and this contradiction is particularly outstanding when bandwidth is near 0.5%, and desirable solution is seen at the end so far.
Fig. 1 is the sectional view of microstrip line.Figure is micro belt conductor 3 at the middle and upper levels, and the centre is a medium 2, and lower floor is a ground plane conductor 1.The manufacturing technology of microstrip line is a kind of prior art.
Shown in Figure 2 be typical traditional filter topology (with reference to H.Jia-Sheng, E.P.McErlean, and B.Karyamapudi; " High-order superconducting filter withgroup delay equalization; " 2005, p.4pp.), its topological structure is an one dimension; Introduce cross-couplings through between non-conterminous resonator, adding coupling line; The shortcoming of this coupled modes has 2 points: 1, and overall filter length is approximately the width of all resonators, and medium or superconducting thin film space can not be used fully; 2, need to add and pass through the coupling line INDIRECT COUPLING between cross-linked two resonators, cross-linked adjustable extent was smaller when the later stage was tuning.
Summary of the invention
The objective of the invention is to disclose a kind of filter, this filter is made up of through a kind of novel coupling process the resonator of lumped parameter, utilizes this coupled modes; Can with not on the same group the distance between the resonator draw back, significantly reduce parasitic couplings, make respectively to organize between the resonator to be independent of each other; And make filter insertion loss little; Band is outer to suppress big, and the band edge steepness is high, and the group delay performance is good.
The invention provides the coupling process between a kind of resonator; This resonator comprises one group of slotting electric capacity, one group of double helix curve inductance and one group of block electric capacity that forms with ground of referring to being made up of little band; Said little band comprises upper and lower two-layer superconducting thin film and the artificial single crystal's medium between two-layer superconducting thin film; Said slotting finger electric capacity is parallelly connected with said double helix curve inductance, said slotting finger electric capacity and the said double helix curve inductance and the said block capacitances in series of parallel connection; It is characterized in that; With shortening or excision fully with the slotting identical lines of charge polarity of the outermost single line bar of electric capacity that refer to of second resonator in the slotting finger electric capacity of first resonator; Second resonator inserted the outermost single line bar that refers to electric capacity to be elongated crooked; And extend into and be shortened in the slotting finger electric capacity of first resonator or the lines place of excision fully, and with the slotting finger electric capacity of first resonator in two adjacent lines couplings.
Be shortened or the lines of excision fully in the slotting finger electric capacity of first resonator from the outside several second lines;
Insert the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change to be coupled and keep the distance between first resonator and second resonator through changing part and first resonator that second resonator insert to refer to electric capacity outermost lines; Perhaps, can change the distance between first resonator and second resonator, and keep the size that is coupled between them through changing part that second resonator insert to refer to electric capacity outermost lines.
Directly be coupled as main coupling and/or cross-couplings between the described resonator.
Between the described resonator or resonator side can add the fine setting that coupling line is coupled.
Said coupling line is straight line or broken line, between resonator or the resonator side.
The invention provides a kind of microstrip filter; Comprise the little band of input, the little band of output and a plurality of resonator; Said resonator is lined up two rows; Three of resonators or tetrad; With insert referring to that with a resonator of the lower left of one group of back the identical lines of charge polarity of the outermost single line bar of electric capacity shorten or excision fully in the slotting finger electric capacity of a bottom-right resonator of last group; It is crooked that a resonator of the lower left of one group of back insert is referred to that the outermost single line bar of electric capacity elongates, and extend into a bottom-right resonator of last group and insert and refer to be shortened in the electric capacity or the lines place of excision fully, and with the slotting finger electric capacity of a bottom-right said resonator of last group in adjacent lines coupling;
Perhaps will the back shorten or excision fully with identical lines of charge polarity that a bottom-right resonator of last group is inserted the outermost single line bar that refers to electric capacity in one group the slotting finger electric capacity of a resonator of lower left; A bottom-right resonator of last group is inserted the outermost single line bar that refers to electric capacity to be elongated crooked; And a said resonator that extend into the lower left of one group of back insert to refer to be shortened in the electric capacity or the lines place of excision fully, and with the slotting finger electric capacity of a resonator of the lower left of one group of back in adjacent lines coupling.
Resonator comprises one group of slotting electric capacity, one group of double helix curve inductance and one group of block electric capacity that forms with ground of referring to being made up of little band; Said little band comprises upper and lower two-layer superconducting thin film and the artificial single crystal's medium between two-layer superconducting thin film; Said slotting finger electric capacity is parallelly connected with said double helix curve inductance, said slotting finger electric capacity and the said double helix curve inductance and the said block capacitances in series of parallel connection.
With an elongation in the end of the double helix curve of said resonator, to reach the purpose that when two resonators distances are far away, just can reach needed coupling.
Be shortened or the lines of excision fully be in last group the slotting finger electric capacity of a bottom-right resonator from the outside several second lines, perhaps in the slotting finger electric capacity of a resonator of the lower left of one group of back from the outside several second lines; It is crooked that a resonator of the lower left of one group of back insert is referred to that the outermost single line bar of electric capacity elongates; And extend into last group a bottom-right resonator between outside several first and the 3rd lines; A resonator of the lower left through changing one group of back insert to refer to that a bottom-right resonator of part and last group of electric capacity outermost lines inserts the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change coupling, and keep last group of resonator and after distance between one group of resonator; Perhaps, insert to refer to that through a bottom-right resonator that changes one group of back the elongation of electric capacity outermost lines partly changes last group of resonator and the back distance between one group of resonator, and keep the size that is coupled between them;
Perhaps a bottom-right resonator of last group being inserted the outermost single line bar that refers to electric capacity elongates crooked; And extend into one group of back the lower left a resonator between outside several first and the 3rd lines; Insert to refer to that through a bottom-right resonator that changes last group a resonator of part and the lower left of one group of back of electric capacity outermost lines inserts the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change coupling, and the distance between one group of resonator and the last group of resonator after the maintenance; Perhaps, insert to refer to that through a resonator that changes last group lower left the elongation of electric capacity outermost lines partly changes the distance between the one group of resonator in back and the last group of resonator, and keep the size that is coupled between them.
In the said filter the little band of input, the little band of output separately with said resonator in the resonator that closes on most directly link to each other; Perhaps the end with the little band of said input elongates with the top of the little band of output, lets little band portion of input and output and resonator increase coupling; Perhaps the input and output coupling line is stretched in the slotting finger electric capacity of resonator, form and insert finger electric capacity, realize the input and output close coupling.
Directly be coupled as main coupling and/or cross-couplings between the described resonator.
Between the described resonator or resonator side can add the fine setting that coupling line is coupled.
Said coupling line is straight line or broken line, between resonator or the resonator side.
The brand-new coupling process and the topological structure that provide among the present invention can solve two problems: 1, and coupled structure is two-dimentional, can better utilization medium or superconducting thin film space; 2, it is direct-coupled needing to introduce cross-linked two resonators, and the scope that can regulate when the later stage is tuning like this is just very big; 3, the parasitic couplings between the different resonator group is little.
Advantages such as it is little that filter of the present invention has the loss of insertion, and band is outer to suppress big, and the band edge steepness is high, and the group delay performance is good.
Description of drawings
Fig. 1 is the sectional view of microstrip line;
Fig. 2 is typical traditional filter topology;
Fig. 3 is a kind of geometry sketch map of planar superconducting microstrip resonator of the present invention;
Fig. 4 is brand-new coupled structure of the present invention and CHARGE DISTRIBUTION sketch map;
Fig. 5 a, 5b, 6a, 6b, the 7th, the little band of input, the little band of input insert several kinds of forms of filter among the present invention;
Fig. 8 a, 8b, 8c, 8d are the structures of several kinds of resonator group among the present invention;
Fig. 9 is the related a kind of microstrip filter structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done description further.
The planar superconducting microstrip resonator that the present invention uses: comprise one group of slotting electric capacity, one group of double helix curve inductance and one group of block electric capacity that forms with ground of referring to forming by little band; Said little band comprises upper and lower two-layer superconducting thin film and the artificial single crystal's medium between two-layer superconducting thin film; Said slotting finger electric capacity is parallelly connected with said double helix curve inductance, said slotting finger electric capacity and the said double helix curve inductance and the said block capacitances in series of parallel connection.
Said block electric capacity can be straight line, broken line, and circle, rectangle, trapezoidal, triangular form or other arbitrary polygons, two block electric capacity can be identical, also can be different.
Said slotting finger electric capacity is that two groups of parallel lines that are connected in block electric capacity intersect, and opposite charge between any two adjacent lines has been formed an electric capacity.
Direction of resonant current in said one group of double helix curve inductance between any two adjacent curves is opposite.
Said double helix curve inductance can be a circle, two circles, three circles or any multi-turn.
Said block electric capacity is rectangle, and double helix curve inductance is two, and said micro-strip resonantor is long to be 8.3mm, and wide is 4.3mm, and the microstrip line live width of said micro-strip resonantor is 0.08mm, and distance between centers of tracks is 0.08mm.
The slotting finger electric capacity of different characteristic, block electric capacity and double helix curve inductance can connect together with combination in any forms a lumped parameter resonator, and the three is independent of each other.
Coupled modes between traditional resonator all are the sizes that changes coupling coefficient through the distance between the change resonator.The invention provides the coupling process between a kind of resonator; The brand-new coupled modes that provide among the present invention make the size of coupling coefficient and the range-independence between the resonator; Both can be so that under the situation that does not change distance between the resonator, changed the size of coupling coefficient; In other words, can be in the distance that changes under the situation that does not change the coupling coefficient size between the resonator.Like this can be so that Filter Design is more flexible.
Said coupling process is following: with several second lines shorten from the outside in the slotting finger electric capacity of first resonator; Even excision fully; Second resonator inserted the outermost single line bar that refers to electric capacity to be elongated; Crooked (like Fig. 4); And extend into first resonator between outside several first and the 3rd lines; This three straight lines have just constituted a kind of brand-new coupled modes that refer to that through inserting electric capacity is realized like this, and this coupled modes can be inserted a part that refers to electric capacity outermost lines and first resonator and insert the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change and be coupled and do not change the distance between first resonator and second resonator through changing second resonator; Simultaneously, can partly change the distance between first resonator and second resonator through changing b that second resonator insert to refer to electric capacity outermost lines, and not change the size that is coupled between them, this brings great convenience to Filter Design.
Fig. 4 is an embodiment who carries out the resonator coupling; In fact as long as with shortening with the identical lines of the outmost lines polarity of second resonator slotting finger electric capacity in the slotting finger of first resonator electric capacity or excising fully; Then with second the outmost lines stretch bending of resonator; Be positioned over and insert the lines place that refers to that electric capacity is shortened or excise fully in first resonator, get final product with adjacent lines coupling.
A kind of microstrip filter disclosed by the invention; Be made up of the little band k1 of input, the little band k2 of output and a plurality of resonator, resonator is lined up two rows, three of resonators or tetrad; Distance is drawn back to reduce parasitic couplings between every group, couples together through above-mentioned special Coupling mode between every group.See Fig. 9; With several second lines shorten or excision fully (charge polarity of the outermost single line bar of the slotting finger of the resonator electric capacity of one group of lower left of the polarity of these lines and back is identical) from the outside in the slotting finger electric capacity of a bottom-right resonator of last group; It is crooked that a resonator of the lower left of one group of back insert is referred to that the outermost single line bar of electric capacity elongates; And extend into last group a bottom-right resonator between outside several first and the 3rd lines, the bottom-right resonator that a resonator of the lower left through changing one group of back is inserted the part that refers to electric capacity outermost lines and last group insert the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines change last group of lower right resonator with after be coupled between one group of lower left resonator keep last group of resonator and after distance between one group of resonator; Simultaneously; A resonator of lower left that can be through changing one group of back insert to refer to that the b among Fig. 4 of electric capacity outermost lines partly changes the distance between one group of resonator of last group of resonator and back, and keep last group of lower right resonator and after the size that is coupled between one group of lower left resonator.
In like manner; Also can be that several second lines shorten or excision fully from the outside in the slotting finger electric capacity of a resonator with the lower left of one group of back; A bottom-right resonator of last group is inserted the outermost single line bar that refers to electric capacity to be elongated crooked; And extend into one group of back the lower left a resonator between outside several first and the 3rd lines, a resonator inserting the lower left of one group of the part that refers to electric capacity outermost lines and back through a bottom-right resonator that changes last group insert the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines change be coupled between the one group of lower left resonator in back and the last group of lower right resonator keep last group of resonator and after distance between one group of resonator; Simultaneously; Can insert refer to that the b among Fig. 4 of electric capacity outermost lines partly changes the distance between one group of resonator of last group of resonator and back through a bottom-right resonator that changes last group, and the size that is coupled between one group of lower left resonator and the last group of lower right resonator after keeping.
In the filter among the present invention, import little band k1, the little band of output k2 separately with the resonator battle array in the resonator r1, the r12 that close on most directly link to each other (Fig. 5 a, Fig. 5 b).In addition; Also can the end of the little band of input be made some changes with the top of the little band of output: 1, the end and the top of the little band of output of the little band of input are elongated, let little part as much as possible and the resonator be with of input and output increase coupling; Be coupled to reach stronger input and output (Fig. 6 a, 6b); 2, the input and output coupling line is stretched in the slotting finger electric capacity of resonator, form and insert finger electric capacity, be coupled to reach bigger input and output (Fig. 7, Fig. 9).
Simultaneously, in order to adapt to the coupled modes in this filter, reduce parasitic couplings; Resonator has been done change; Like Fig. 3, with an elongation in the end of the double helix curve of resonator, to reach the purpose that when two resonators distances are far away, just can reach needed coupling.Utilize this coupled modes, can the distance between the resonator on the same group be drawn back, significantly reduce parasitic couplings.Certainly, if use the resonator among Fig. 4 also can use method provided by the invention to form filter.
Microstrip line among the present invention is the superconductive micro-strip line, and its upper strata micro belt conductor 3 is high-temperature superconducting thin film with lower floor's ground plane conductor 1, and the centre is that dielectric constant is ε
rThe monocrystalline dieelctric sheet.The microstrip line geometry of mentioning among the present invention refers to the geometry that upper strata micro belt conductor 3 constitutes.When the design micro-strip resonantor, dielectric thickness h, DIELECTRIC CONSTANTS
rBe known.
In addition, the invention provides a kind of brand-new coupling topological structure, can three in the above-mentioned described filter (Fig. 8 a) or four be one group (like Fig. 8 b, 8c; 8d), being one group with four is example as explanation (Fig. 8 a), resonator a1 and a2; A2 and a3, directly coupling between a3 and the a4 is main coupling; Simultaneously, directly coupling is cross-couplings between resonator a1 and the a4; Cross-couplings is directly coupling like this, and it is tuning to be more conducive to the later stage, can better make accurate elliptic function filter; Simultaneously, can change perhaps cross-linked polarity of main coupling with the coupling unit (like Fig. 8 b) of a3 or the coupling unit (like Fig. 8 c) that changes cross-couplings a1 and a4, can design accurate elliptic filter of different nature easily through changing main coupling a2; If there is not coupling time between a1 and the a4, just can be used for making Chebyshev filter.Simultaneously, because filter has been done adjustment (having elongated the part of double helix curve), be in filter a1 and a3 on the diagonal like this, the distance between a2 and the a4 is distant, and parasitic couplings can be smaller.In addition, the shared width of four filters probably is the width of two filters, has utilized substrate space so greatly.
Between each resonator of filter,, can add the fine setting that coupling line is coupled in the present invention for the coupling between finely tuning.As between resonator, adding straight line, see w6 among Fig. 9, w7, w8, w9, w10 or broken line w1, w2 perhaps adds straight line w3 in the resonator side, w4, w5 or broken line can be regulated the coupling between the resonator more easily.Among Fig. 9, exponent number is 12 rank.Wherein r1-r12 is a resonator, and wherein r4 and r5 are coupled through the brand-new coupled structure of mentioning among the present invention between r8 and the r9, and w1-w10 is a coupling line, and k1 is an incoming line, and k2 is an output line.
Design work utilizes microwave simulation software (like sonnet or ansoft) to carry out concrete operations and emulation on computers among the present invention.
Superconducting microstrip resonator among the present invention is made by conventional process, promptly makes by processing steps such as photoetching, dry etching, cutting, assemblings, belongs to those skilled in the art's known technology.
It will be appreciated that although the 26S Proteasome Structure and Function that many feature and advantage of the present invention and the present invention have has been explained in the description of front, the present invention openly only is exemplary, that is to say on details to have a lot of changes.The people of skilled knows other some modifications and replacement, and these modifications and replacement are included within the scope of appended claims.
Claims (13)
1. the coupling process between the resonator; This resonator comprises one group of slotting electric capacity, one group of double helix curve inductance and one group of block electric capacity that forms with ground of referring to being made up of little band; Said little band comprises upper and lower two-layer superconducting thin film and the artificial single crystal's medium between two-layer superconducting thin film; Said slotting finger electric capacity is parallelly connected with said double helix curve inductance, said slotting finger electric capacity and the said double helix curve inductance and the said block capacitances in series of parallel connection; It is characterized in that; With shortening or excision fully with the slotting identical lines of charge polarity of the outermost single line bar of electric capacity that refer to of second resonator in the slotting finger electric capacity of first resonator; Second resonator inserted the outermost single line bar that refers to electric capacity to be elongated crooked; And extend into and be shortened in the slotting finger electric capacity of first resonator or the lines place of excision fully, and with the slotting finger electric capacity of first resonator in two adjacent lines couplings.
2. the coupling process between the resonator as claimed in claim 1 is characterized in that, be shortened or the lines of excision fully in the slotting finger electric capacity of first resonator from the outside several second lines;
Insert the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change to be coupled and keep the distance between first resonator and second resonator through changing part and first resonator that second resonator insert to refer to electric capacity outermost lines; Perhaps, can change the distance between first resonator and second resonator, and keep the size that is coupled between them through changing part that second resonator insert to refer to electric capacity outermost lines.
3. the coupling process between according to claim 1 or claim 2 the resonator is characterized in that, directly is coupled as main coupling and/or cross-couplings between the described resonator.
4. the coupling process between according to claim 1 or claim 2 the resonator is characterized in that, can add the fine setting that coupling line is coupled between the described resonator.
5. the coupling process between the resonator as claimed in claim 4 is characterized in that said coupling line is straight line or broken line, between resonator or the resonator side.
6. microstrip filter; It is characterized in that; Comprise the little band of input, the little band of output and a plurality of resonator; Said resonator comprises one group of slotting electric capacity, one group of double helix curve inductance and one group of block electric capacity that forms with ground of referring to being made up of little band; And this resonator is lined up two rows; Three of resonators or tetrad with shortening or excision fully with identical lines of charge polarity that a resonator of the lower left of one group of back is inserted the outermost single line bar that refers to electric capacity in the slotting finger electric capacity of a bottom-right resonator of last group, are inserted the outermost single line bar that refers to electric capacity with a resonator of the lower left of one group of back and are elongated crooked; And a bottom-right resonator that extend into last group insert to refer to be shortened in the electric capacity or the lines place of excision fully, and with the slotting finger electric capacity of a bottom-right said resonator of last group in adjacent lines coupling;
Perhaps will the back shorten or excision fully with identical lines of charge polarity that a bottom-right resonator of last group is inserted the outermost single line bar that refers to electric capacity in one group the slotting finger electric capacity of a resonator of lower left; A bottom-right resonator of last group is inserted the outermost single line bar that refers to electric capacity to be elongated crooked; And a said resonator that extend into the lower left of one group of back insert to refer to be shortened in the electric capacity or the lines place of excision fully, and with the slotting finger electric capacity of a resonator of the lower left of one group of back in adjacent lines coupling.
7. microstrip filter as claimed in claim 6; It is characterized in that; Little band described in the said resonator comprises upper and lower two-layer superconducting thin film and the artificial single crystal's medium between two-layer superconducting thin film; Said slotting finger electric capacity is parallelly connected with said double helix curve inductance, said slotting finger electric capacity and the said double helix curve inductance and the said block capacitances in series of parallel connection.
8. microstrip filter as claimed in claim 7 is characterized in that, with an elongation in the end of the double helix curve of said resonator, to reach the purpose that when two resonators distances are far away, just can reach needed coupling.
9. like claim 7 or 8 described microstrip filters; It is characterized in that; Be shortened or the lines of excision fully be in last group the slotting finger electric capacity of a bottom-right resonator from the outside several second lines, perhaps in the slotting finger electric capacity of a resonator of the lower left of one group of back from the outside several second lines; It is crooked that a resonator of the lower left of one group of back insert is referred to that the outermost single line bar of electric capacity elongates; And extend into last group a bottom-right resonator between outside several first and the 3rd lines; A resonator of the lower left through changing one group of back insert to refer to that a bottom-right resonator of part and last group of electric capacity outermost lines inserts the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change coupling, and keep last group of resonator and after distance between one group of resonator; Perhaps, insert to refer to that through a bottom-right resonator that changes one group of back the elongation of electric capacity outermost lines partly changes last group of resonator and the back distance between one group of resonator, and keep the size that is coupled between them;
Perhaps a bottom-right resonator of last group being inserted the outermost single line bar that refers to electric capacity elongates crooked; And extend into one group of back the lower left a resonator between outside several first and the 3rd lines; Insert to refer to that through a bottom-right resonator that changes last group a resonator of part and the lower left of one group of back of electric capacity outermost lines inserts the length that refers to electric capacity outermost and the second outer lines, the 3rd outer lines and change coupling, and the distance between one group of resonator and the last group of resonator after the maintenance; Perhaps, insert to refer to that through a resonator that changes last group lower left the elongation of electric capacity outermost lines partly changes the distance between the one group of resonator in back and the last group of resonator, and keep the size that is coupled between them.
10. microstrip filter as claimed in claim 9 is characterized in that, in the said filter the little band of input, the little band of output separately with said resonator in the resonator that closes on most directly link to each other; Perhaps the end with the little band of said input elongates with the top of the little band of output, lets little band portion of input and output and resonator increase coupling; Perhaps the input and output coupling line is stretched in the slotting finger electric capacity of resonator, form and insert finger electric capacity, realize the input and output close coupling.
11. microstrip filter as claimed in claim 9 is characterized in that, directly is coupled as main coupling and/or cross-couplings between the described resonator.
12. microstrip filter as claimed in claim 9 is characterized in that, between the described resonator or resonator side can add the fine setting that coupling line is coupled.
13. microstrip filter as claimed in claim 12 is characterized in that, said coupling line is straight line or broken line, between resonator or the resonator side.
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| CN104993196A (en) * | 2015-07-07 | 2015-10-21 | 深圳市西博泰科电子有限公司 | Radio-frequency band-pass filter |
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| CN106329042A (en) * | 2016-10-25 | 2017-01-11 | 绍兴文理学院 | Cascaded wide stopband superconducting band-pass filter and design method |
| CN106410338B (en) * | 2016-11-18 | 2020-12-18 | 桂林电子科技大学 | High-temperature superconducting filter |
| CN108539337B (en) * | 2018-04-09 | 2019-07-30 | 浙江嘉科电子有限公司 | A kind of novel crossed coupling membrane low-pass filter |
| WO2020147064A1 (en) | 2019-01-17 | 2020-07-23 | 罗森伯格技术（昆山）有限公司 | Single-layer cross-coupled filter |
| CN112563700B (en) * | 2020-08-13 | 2022-01-04 | 中国科学院国家天文台 | Submillimeter wave multi-band imaging superconducting band-pass filter array system and implementation method |
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| CN101546854A (en) | 2009-09-30 |
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