CN101867081B - Two-dimensional sheet dual-mode resonator, filter and fabrication method thereof - Google Patents
Two-dimensional sheet dual-mode resonator, filter and fabrication method thereof Download PDFInfo
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- CN101867081B CN101867081B CN200910082401.5A CN200910082401A CN101867081B CN 101867081 B CN101867081 B CN 101867081B CN 200910082401 A CN200910082401 A CN 200910082401A CN 101867081 B CN101867081 B CN 101867081B
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Abstract
The invention relates to a two-dimensional sheet dual-mode resonator, a filter and a fabrication method thereof. The two-dimensional sheet dual-mode resonator comprises a resonator component and one or more adjusting components, the resonator component is used for exciting two degenerate resonance modes, the adjusting components are used for adjusting the resonant frequencies of the degenerate resonance modes and the coupling coefficient between the two degenerate resonance modes to preset standards, and the adjusting components are one-dimensional or two-dimensional figures, and are located on the same plane as the resonator component. The invention can ensure that the resonant frequencies of the degenerate resonance modes of the two-dimensional sheet dual-mode resonator and the coupling coefficient between the two degenerate resonance modes can reach the preset standards.
Description
Technical field
The present invention relates to microstrip filter, relate in particular to a kind of two-dimensional sheet dual-mode filter and manufacture method thereof.
Background technology
In microwave engineering, micro-strip resonantor can form the microstrip filter of different rank, and a kind of passive device is widely used in many microwave circuits and system, is used for selecting the signal of characteristic frequency.
High temperature superconduction wave filter is a kind of planar device made from high temperature superconducting materia, it by several planar resonator by certain regularly arranged forming.Compare conventional material, it has low difference and enters loss, high Out-of-band rejection and frequency selective characteristic, and the sensitivity that can greatly improve system, but the power bearing ability of high temperature superconduction wave filter is very poor.The mode of solution is a resonator that uses two-dimensional sheet, because the area of two-dimensional sheet resonator is very large, be difficult to do higher order filter, thereby the frequency selective characteristic of filter is very poor.Utilize bimodulus technology can in same resonator, excite two kinds of degeneracy modes of resonance, greatly reduce the size of filter.
Therefore two-dimensional sheet dual-mode resonator is considered to a kind of poor scheme of high temperature superconduction wave filter power bearing ability that solves.But for the resonance frequency of two degeneracy modes of resonance of two-dimensional sheet dual-mode resonator be difficult to adjust, coupling coefficient between two degeneracy modes of resonance is difficult to control, the narrow band filter that especially bandwidth is less than 1%, the filter response that more difficult acquisition is good.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of two-dimensional sheet dual-mode resonator, filter and manufacture method thereof, can make the coupling coefficient between resonance frequency and the two kinds of degeneracy modes of resonance of degeneracy mode of resonance of two-dimensional sheet dual-mode resonator reach preset standard.
The invention discloses a kind of two-dimensional sheet dual-mode resonator, comprise the resonator assembly for exciting two kinds of degeneracy modes of resonance, described two-dimensional sheet dual-mode resonator also comprises:
It is one or more for regulating coupling coefficient between resonance frequency and described two kinds of degeneracy modes of resonance of the described degeneracy mode of resonance adjusting part to preset standard,
Described adjusting part is one dimension or X-Y scheme, is positioned at same plane with described resonator assembly.
Described adjusting part be shaped as triangle, square, polygon or circle.
Described adjusting part is dual slope or single broken line.
Described adjusting part is solid or hollow.
The area of described adjusting part is less than 50% of described resonator assembly area.
Described adjusting part is identical with described resonator assembly material.
The invention also discloses a kind of two-dimensional sheet dual-mode filter, described filter comprises two-dimensional sheet dual-mode resonator;
Described two-dimensional sheet dual-mode resonator, comprise the resonator assembly for exciting two kinds of degeneracy modes of resonance, and one or more for regulating coupling coefficient between resonance frequency and described two kinds of degeneracy modes of resonance of the described degeneracy mode of resonance adjusting part to preset standard, described adjusting part is one dimension or X-Y scheme, is positioned at same plane with described resonator assembly.
Described adjusting part be shaped as triangle, square, polygon or circle.
Described adjusting part is dual slope or single broken line.
Described adjusting part is solid or hollow.
The area of described adjusting part is less than 50% of described resonator assembly area.
Described adjusting part is identical with described resonator assembly material.
The invention also discloses a kind of manufacture method of two-dimensional sheet dual-mode resonator, comprise the resonator assembly that is formed for exciting two kinds of degeneracy modes of resonance, and form one or more adjusting parts in described resonator assembly place plane simultaneously, to regulate coupling coefficient between resonance frequency and described two kinds of degeneracy modes of resonance of described degeneracy mode of resonance to preset standard;
Described adjusting part is one dimension or X-Y scheme.
Described adjusting part be shaped as triangle, square, polygon or circle.
Described adjusting part is dual slope or single broken line.
Described adjusting part is solid or hollow.
The area of described adjusting part is less than 50% of described resonator assembly area.
Described adjusting part is identical with described resonator assembly material.
Beneficial effect of the present invention is, by forming in the plane adjusting part at existing two-dimensional sheet dual-mode resonator, can effectively regulate between the degeneracy mode of resonance resonance frequency of fundamental resonance unit of dual mode filter and two kinds of degeneracy modes of resonance coupling coefficient; And the present invention is easy, directly perceived, regulate efficiency high, can shorten the design time of two-dimentional dual mode filter; The present invention is not only applicable to super conductive filter and is also applicable to conventional planar metal microstrip filter.
Accompanying drawing explanation
Fig. 1 is the structure chart of the embodiment 1 of two-dimensional sheet dual-mode resonator of the present invention;
Fig. 2 is the structure chart of the embodiment 2 of two-dimensional sheet dual-mode resonator of the present invention;
Fig. 3 is the structure chart of the embodiment 3 of two-dimensional sheet dual-mode resonator of the present invention;
Fig. 4 is the structure chart of the embodiment 4 of two-dimensional sheet dual-mode resonator of the present invention;
Fig. 5 is the structure chart of the embodiment 5 of two-dimensional sheet dual-mode resonator of the present invention;
Fig. 6 is the structure chart of the specific embodiment of 4 rank two-dimensional sheet dual-mode filters of the present invention;
Fig. 7 is the reflex response simulation result figure of 4 rank two-dimensional sheet dual-mode filters of prior art;
Fig. 8 is the CURRENT DISTRIBUTION result figure in the working frequency range of 4 rank two-dimensional sheet dual-mode filters of prior art;
Fig. 9 is emulation and the practical filter test result figure of 4 rank two-dimensional sheet dual-mode filters of the present invention;
Figure 10 is the CURRENT DISTRIBUTION result figure in the working frequency range of 4 rank two-dimensional sheet dual-mode filters of the present invention;
Figure 11 is the structure chart of the specific embodiment of 6 rank two-dimensional sheet dual-mode filters of the present invention;
Figure 12 is the structure chart of the specific embodiment of 8 rank two-dimensional sheet dual-mode filters of the present invention;
Figure 13 is the structure chart of the specific embodiment of 12 rank two-dimensional sheet dual-mode filters of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Two-dimensional sheet dual-mode resonator of the present invention, comprise resonator assembly for exciting two kinds of degeneracy modes of resonance and one or more for regulating coupling coefficient between resonance frequency and two kinds of degeneracy modes of resonance of the described degeneracy mode of resonance adjusting part to preset standard, described adjusting part is one dimension or X-Y scheme, is positioned at same plane with described resonator assembly.
The area of adjusting part is less than 50% of described resonator assembly area.Described adjusting part is identical with described resonator assembly material.
Resonator assembly is two-dimensional sheet dual-mode resonator of the prior art.
As shown in Figure 1, in embodiment 1, resonator assembly is corner cut square dual-mode resonator 101, and this corner cut square dual-mode resonator 101 excites two kinds of degeneracy modes of resonance, is respectively first mode 1 and the second pattern 2.Adjusting part is rectangular module 102, be positioned at corner cut square dual-mode resonator 101 under a side of widthwise edge, the long limit of rectangular module 102 is parallel with vertical edges with the widthwise edge of the square dual-mode resonator 101 of corner cut respectively with minor face.
Parameter a represents the size of the length of rectangle, and parameter b represents the wide size of rectangle.Parameter g represent rectangular module 102 upper long limit to corner cut square dual-mode resonator 101 under the distance of widthwise edge, parameter d represent rectangular module 102 at right minor face apart from corner cut square dual-mode resonator 101 distance in right vertical edges.
The value that changes parameter a and parameter b is adjusted the size of rectangular module 102, and adjusts the value of parameter g and parameter d, adjusts the position of rectangular module 102 with respect to the square dual-mode resonator 101 of corner cut.Determine size and the position of rectangular module 102 by above-mentioned adjustment, so that the coupling coefficient between first mode 1 and resonance frequency and two degeneracy modes of resonance of the second pattern 2 reaches preset standard in corner cut square dual-mode resonator 101.
As shown in Figure 2, in embodiment 2, resonator assembly is corner cut square dual-mode resonator 201, and this corner cut square dual-mode resonator 201 excites two kinds of degeneracy modes of resonance, is first mode 1 and the second pattern 2.Adjusting part is dual slope assembly 202, be positioned at corner cut square dual-mode resonator 201 in right vertical edges one side, the widthwise edge of dual slope assembly 202 is parallel with vertical edges with the widthwise edge of corner cut square dual-mode resonator 201 respectively with vertical edges.
As shown in Figure 3, in embodiment 3, resonator assembly is corner cut square dual-mode resonator 301, and this corner cut square dual-mode resonator 301 excites two kinds of degeneracy modes of resonance, is first mode 1 and the second pattern 2.Adjusting part is diamond shaped assembly 302, is positioned at hypotenuse one side of corner cut square dual-mode resonator 301.A limit of diamond shaped assembly 302 is parallel with the hypotenuse of corner cut square dual-mode resonator 301.
As shown in Figure 4, in embodiment 4, resonator assembly is hollow fillet square dual-mode resonator 401, and this hollow fillet square dual-mode resonator 401 excites two kinds of degeneracy modes of resonance, is first mode 1 and the second pattern 2.There are two adjusting parts, be respectively assembly 402 and rectangular module 403.Assembly 402 is made up of a rectangle and two semicircles.Assembly 402 be positioned at hollow fillet square dual-mode resonator 401 in left vertical edges one side, in assembly 402, the limit of rectangle is parallel with the vertical edges of hollow fillet square dual-mode resonator 401.Rectangular module 403 be positioned at hollow fillet square dual-mode resonator 401 in upper widthwise edge one side, the long limits of rectangular module 403 are parallel with the widthwise edge of hollow fillet square dual-mode resonator 401.
As shown in Figure 5, in embodiment 5, resonator assembly is corner cut equilateral triangle dual-mode resonator 501, and this corner cut equilateral triangle dual-mode resonator 501 excites two kinds of degeneracy modes of resonance, is expressed as first mode 1 and the second pattern 2.There are two adjusting parts, be respectively the first diamond shaped assembly 502 and the second diamond shaped assembly 503.The first diamond shaped assembly 502 is positioned at a side of a waist of corner cut equilateral triangle dual-mode resonator 501, and one side of the first diamond shaped assembly 502 is parallel with the base of corner cut equilateral triangle dual-mode resonator 501.The second diamond shaped assembly 503 is positioned at a side of another waist of corner cut equilateral triangle dual-mode resonator 501, and one side of the second diamond shaped assembly 503 is parallel with the base of corner cut equilateral triangle dual-mode resonator 501.
Two-dimensional sheet dual-mode filter of the present invention comprises two-dimensional sheet dual-mode resonator.Two-dimensional sheet dual-mode resonator comprises resonator assembly for exciting two kinds of degeneracy modes of resonance and one or more for regulating coupling coefficient between frequency and two kinds of degeneracy modes of resonance of the described degeneracy mode of resonance adjusting part to preset standard, described adjusting part is one dimension or X-Y scheme, is positioned at same plane with described resonator assembly.The area of adjusting part is less than 50% of described resonator assembly area.Described adjusting part is identical with described resonator assembly material.This filter is super conductive filter or conventional planar metal microstrip filter.
As shown in Figure 6, take Chebyshev's 4 rank filters as example, this filter comprises two resonators.Each resonator have one on angle cut fall the square resonator of an isosceles right triangle as the resonator assembly of this resonator, two corner cut square dual-mode resonators are respectively the first resonator assembly 611 and the second resonator assembly 621.
The first resonator assembly 611 excites two kinds of degeneracy modes of resonance.Form the first adjusting part 612 at the first resonator assembly 611 in left vertical edges one side.The first adjusting part 612 is rectangle, and its long limit is parallel with the vertical edges of the first resonator assembly 611.
The partial enlarged drawing of the corner cut of the first resonator assembly 611 is labeled as 613, and parameter c 2 is for representing corner cut size.D2 represents the first resonator assembly 611 and the second resonator assembly 621 spacings.
The second resonator assembly 621 excites two kinds of degeneracy modes of resonance.Form the second adjusting part 622 at the second resonator assembly 621 in right vertical edges one side.The second adjusting part 622 is rectangle, and its long limit is parallel with the vertical edges of the second resonator assembly 621.
This filter also comprises two input and output coupling lines.
The size on the long limit of the first adjusting part 612 is expressed as a
2, the first adjusting part 612 is shown parameter g at the distance table in left vertical edges of right long back gauge the first resonator assembly 611
2.Adjust parameter a
2and g
2determine size and the position of the first adjusting part 612, so that the coupling coefficient between two kinds of degeneracy modes of resonance of the resonance frequency of the degeneracy mode of resonance of this filter and each resonator assembly reaches preset standard.
CURRENT DISTRIBUTION in simulation result and the working frequency range of the 4 rank two-dimensional sheet dual-mode filter reflex responses that do not comprise adjusting part respectively as shown in Figure 7 and Figure 8.Filter reflex response simulation result in above-described embodiment and actual test result, and CURRENT DISTRIBUTION is respectively as shown in Figure 9 and Figure 10.Wherein simulation software is sonnet.
Adding, the reflex response of adjusting part pre-filter is poor, be less than-3dB of the reflection in filter passband, as shown in Figure 7, adding after adjusting part, select after suitable parameter, the reflex response of filter to be optimized, be less than-15dB of the reflection in filter passband, as shown in Figure 9.As shown in the current distributing figure of emulation, in Fig. 8 and Figure 10, brighter expression current density is larger, has reduced current density thereby Figure 10 CURRENT DISTRIBUTION evenly forms a circle entirety, and in Fig. 8 the inhomogeneous local current densities that causes of CURRENT DISTRIBUTION far above averag density.
The present invention's 6 rank dual mode filters as shown in figure 11, have three resonators, are respectively the first resonator, the second resonator and the 3rd resonator; The first resonator and the second resonator are resonator of the present invention, and the 3rd resonator is prior art resonator.
The resonator assembly of the first resonator is corner cut square dual-mode resonator 1111, excites two kinds of degeneracy modes of resonance, is respectively first mode 1 and the second pattern 2; The adjusting part 1112 of the first resonator is made up of rectangle and semicircle, be positioned at corner cut square dual-mode resonator 1111 in left vertical edges one side, the limit of the rectangle of adjusting part 1112 is parallel with the vertical edges of corner cut square dual-mode resonator 1111.
The resonator assembly of the second resonator is corner cut square dual-mode resonator 1121, excites two kinds of degeneracy modes of resonance, is respectively three-mode 3 and four-mode 4; The second resonator has two adjusting parts, adjusting part 1122 and adjusting part 1123.Adjusting part 1122 is rectangle, be positioned at corner cut square dual-mode resonator 1121 in upper widthwise edge one side, the long limit of adjusting part 1122 is parallel with the widthwise edge of the square dual-mode resonator 1121 of corner cut.Adjusting part 1123 is triangle, is positioned at hypotenuse one side of corner cut square dual-mode resonator 1121, and a limit of adjusting part 1123 is parallel with this hypotenuse.
The 3rd resonator is resonator of the prior art, and it does not comprise adjusting part, and the 3rd resonator is corner cut square dual-mode resonator 1131.
The present invention's 8 rank dual mode filters as shown in figure 12, have four resonators, are respectively the 4th resonator, the 5th resonator, sixth resonator and the 7th resonator.
The resonator assembly of the 4th resonator is corner cut square dual-mode resonator 1211, excites two kinds of degeneracy modes of resonance, is respectively first mode 1 and the second pattern 2; The adjusting part 1212 of the 4th resonator is made up of rectangle and semicircle, be positioned at corner cut square dual-mode resonator 1211 in left vertical edges one side, the limit of rectangle is parallel with the vertical edges of corner cut square dual-mode resonator 1211.
The resonator assembly of the 5th resonator is corner cut square dual-mode resonator 1221, excites two kinds of degeneracy modes of resonance, is respectively three-mode 3 and four-mode 4; The adjusting part 1222 of the 5th resonator is rectangle, be positioned at corner cut square dual-mode resonator 1121 in upper widthwise edge one side, the minor face of adjusting part 1222 is parallel with the vertical edges of corner cut square dual-mode resonator 1221.
The resonator assembly of sixth resonator is corner cut square dual-mode resonator 1231, excites two kinds of degeneracy modes of resonance, is respectively the 5th pattern 5 and the 6th pattern 6; The adjusting part 1232 of sixth resonator is fillet hollow rectangle, be positioned at corner cut square dual-mode resonator 1231 in left vertical edges one side, the long limit of the rectangle of adjusting part 1232 is parallel with the vertical edges of the square dual-mode resonator 1231 of corner cut.
The resonator assembly of the 7th resonator is corner cut square dual-mode resonator 1241, excites two kinds of degeneracy modes of resonance, is respectively the 7th mode 7 and the 8th pattern 8; The adjusting part 1242 of the 7th resonator is single broken line, be positioned at corner cut square dual-mode resonator 1241 in upper widthwise edge one side, the long limit of adjusting part 1242 is parallel with the widthwise edge of the square dual-mode resonator 1241 of corner cut.
The present invention's 12 rank dual mode filters as shown in figure 13, have six resonators, are respectively the 8th resonator, the 9th resonator, the tenth resonator, the 11 resonator, the 12 resonator and the 13 resonator; The 13 resonator is prior art resonator, and other resonators are resonator of the present invention.
The resonator assembly of the 8th resonator is corner cut square dual-mode resonator 1311, excites two kinds of degeneracy modes of resonance, is respectively first mode 1 and the second pattern 2; The adjusting part 1312 of the 8th resonator is made up of rectangle and semicircle, be positioned at corner cut square dual-mode resonator 1311 in left vertical edges one side, the rectangular edges of adjusting part 1312 is parallel with the vertical edges of corner cut square dual-mode resonator 1311.
The resonator assembly of the 9th resonator is corner cut square dual-mode resonator 1321, excites two kinds of degeneracy modes of resonance, is respectively three-mode 3 and four-mode 4; The adjusting part 1322 of the 9th resonator is rectangle, be positioned at corner cut square dual-mode resonator 1321 in upper widthwise edge one side, the long limit of adjusting part 1322 is parallel with the widthwise edge of the square dual-mode resonator 1321 of corner cut.
The resonator assembly of the tenth resonator is corner cut square dual-mode resonator 1331, excites two kinds of degeneracy modes of resonance, is respectively the 5th pattern 5 and the 6th pattern 6; The adjusting part 1332 of the tenth resonator is isosceles right triangle, be positioned at corner cut square dual-mode resonator 1331 in upper widthwise edge one side, a right-angle side of adjusting part 1332 is parallel with the vertical edges of corner cut square dual-mode resonator 1331.
The resonator assembly of the 11 resonator is corner cut square dual-mode resonator 1341, excites two kinds of degeneracy modes of resonance, is respectively the 7th mode 7 and the 8th pattern 8; The adjusting part 1342 of the 11 resonator is hollow ellipse shape, be positioned at corner cut square dual-mode resonator 1341 under widthwise edge one side, the major axis of adjusting part 1342 is parallel with the widthwise edge of corner cut square dual-mode resonator 1341.
The resonator assembly of the 12 resonator is corner cut square dual-mode resonator 1351, excites two kinds of degeneracy modes of resonance, is respectively the 9th pattern 9 and the tenth pattern 10; The adjusting part 1352 of the 12 resonator is single broken line, be positioned at corner cut square dual-mode resonator 1351 in lower widthwise edge one side, the long limit of adjusting part 1352 is parallel with the widthwise edge of the square dual-mode resonator 1351 of corner cut.
The 13 resonator is corner cut square dual-mode resonator 1361, excites two kinds of degeneracy modes of resonance, is respectively the 11 pattern 11 and the tenth two modes 12.
The manufacture method of two-dimensional sheet dual-mode resonator of the present invention, comprise the resonator assembly that is formed for exciting two kinds of degeneracy modes of resonance, and form one or more adjusting parts in described resonator assembly place plane, to regulate coupling coefficient between resonance frequency and described two kinds of degeneracy modes of resonance of described degeneracy mode of resonance to preset standard.
Superconducting microstrip resonator in the present invention is made by conventional process, makes by processing steps such as photoetching, dry etching, cutting, assemblings, belongs to prior art.
Those skilled in the art is not departing under the condition of the definite the spirit and scope of the present invention of claims, can also carry out various modifications to above content.Therefore scope of the present invention is not limited in above explanation, but determined by the scope of claims.
Claims (11)
1. a two-dimensional sheet dual-mode resonator, comprises the resonator assembly for exciting two kinds of degeneracy modes of resonance, it is characterized in that, described two-dimensional sheet dual-mode resonator also comprises:
One or more for regulating the resonance frequency of described two kinds of degeneracy modes of resonance to the adjusting part of preset standard, described adjusting part is positioned at upper next side or left and right one side on the limit of described resonator assembly, or be placed on upper next side and left and right one side on the limit of described resonator assembly simultaneously, change size and the position of described adjusting part, adjust the resonance frequency of two kinds of patterns of bimodulus degeneracy mode of resonance;
Described adjusting part is one dimension or X-Y scheme, is positioned at same plane with described resonator assembly;
Described adjusting part is identical with described resonator assembly material.
2. two-dimensional sheet dual-mode resonator as claimed in claim 1, is characterized in that, described adjusting part be shaped as triangle, square, polygon or circle.
3. two-dimensional sheet dual-mode resonator as claimed in claim 1, is characterized in that, described adjusting part is dual slope or single broken line.
4. two-dimensional sheet dual-mode resonator as claimed in claim 2, is characterized in that, described adjusting part is solid or hollow.
5. two-dimensional sheet dual-mode resonator as claimed in claim 2, is characterized in that, the area of described adjusting part is less than 50% of described resonator assembly area.
6. a two-dimensional sheet dual-mode filter, is characterized in that, described filter comprises as the two-dimensional sheet dual-mode resonator as described in any in claim 1 to 5.
7. the manufacture method of a two-dimensional sheet dual-mode resonator, it is characterized in that, comprise the resonator assembly that is formed for exciting two kinds of degeneracy modes of resonance, and form one or more adjusting parts in described resonator assembly place plane simultaneously, to regulate the resonance frequency of described two kinds of degeneracy modes of resonance to preset standard;
Described adjusting part is positioned at upper next side or left and right one side on the limit of described resonator assembly, adjust respectively the resonance frequency of bimodulus degeneracy mode of resonance, or be placed on upper next side and left and right one side on the limit of described resonator assembly simultaneously, change size and the position of described adjusting part, adjust the resonance frequency of two kinds of patterns of bimodulus degeneracy mode of resonance simultaneously;
Described adjusting part is one dimension or X-Y scheme; Described adjusting part is identical with described resonator assembly material.
8. the manufacture method of two-dimensional sheet dual-mode resonator as claimed in claim 7, is characterized in that, described adjusting part be shaped as triangle, square, polygon or circle.
9. the manufacture method of two-dimensional sheet dual-mode resonator as claimed in claim 7, is characterized in that, described adjusting part is dual slope or single broken line.
10. the manufacture method of two-dimensional sheet dual-mode resonator as claimed in claim 8, is characterized in that, described adjusting part is solid or hollow.
The manufacture method of 11. two-dimensional sheet dual-mode resonators as claimed in claim 8, is characterized in that, the area of described adjusting part is less than 50% of described resonator assembly area.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0573985A1 (en) * | 1992-06-12 | 1993-12-15 | Matsushita Electric Industrial Co., Ltd. | Strip dual mode filter in which a resonance width of a microwave is adjusted and dual mode multistage filter in which the strip dual mode filters are arranged in series |
| CN1224253A (en) * | 1993-10-04 | 1999-07-28 | 松下电器产业株式会社 | Filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2596400B2 (en) * | 1995-04-15 | 1997-04-02 | 日本電気株式会社 | Superconducting filter |
| US6108569A (en) * | 1998-05-15 | 2000-08-22 | E. I. Du Pont De Nemours And Company | High temperature superconductor mini-filters and mini-multiplexers with self-resonant spiral resonators |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0573985A1 (en) * | 1992-06-12 | 1993-12-15 | Matsushita Electric Industrial Co., Ltd. | Strip dual mode filter in which a resonance width of a microwave is adjusted and dual mode multistage filter in which the strip dual mode filters are arranged in series |
| CN1224253A (en) * | 1993-10-04 | 1999-07-28 | 松下电器产业株式会社 | Filter |
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