EP0883202A2 - Vorrichtung zur Filterung von Hochfrequenzsignalen - Google Patents
Vorrichtung zur Filterung von Hochfrequenzsignalen Download PDFInfo
- Publication number
- EP0883202A2 EP0883202A2 EP98105698A EP98105698A EP0883202A2 EP 0883202 A2 EP0883202 A2 EP 0883202A2 EP 98105698 A EP98105698 A EP 98105698A EP 98105698 A EP98105698 A EP 98105698A EP 0883202 A2 EP0883202 A2 EP 0883202A2
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- EP
- European Patent Office
- Prior art keywords
- resonators
- coupling
- bandpass filter
- ring
- filter according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/082—Microstripline resonators
Definitions
- the invention relates to a high-performance bandpass filter, which consists of several superconducting planar resonators is formed and for use in high-frequency systems of communication and location technology is suitable.
- Bandpass filters are used in high-frequency systems in the receiving branch z. B. as a preselection filter and in the form of a filter bank for frequency channeling (input multiplexer) used.
- Such bandpass filters are usually built up from individual resonators, which are suitably coupled to one another and to the feed lines.
- the function of the resonators in a bandpass structure is to store electromagnetic field energy as loss-free as possible.
- the dissipation losses inevitably associated with energy storage in resonators can be quantitatively described using the so-called idle quality.
- Dissipation losses degrade the frequency response of a bandpass filter compared to the ideal lossless bandpass filter in such a way that the insertion loss in the pass band is increased and the filter edges This degrading influence of the dissipation losses is stronger, the smaller the relative bandwidth of the filter and the steeper its filter edges.
- resonators of high idling quality typically with Q 0 > If you consider filters of various designs made of normally conductive materials, e.g.
- planar resonators made of high temperature superconductors in filters for
- higher "operating capacities are subject to a physical limit in that the superconducting properties of materials known today degrade when the magnetic field strength of the high-frequency field on the surface of the superconducting film exceeds values of approximately 50 A / cm.
- This effect is evident in the planar Conductor structures are particularly disadvantageous, since with current lines running parallel to the edges, due to the magnetic field displacement at the edges of the conductors, there is a local field increase of around a factor of 10.
- the value of the maximum high-frequency magnetic field strength is proportional to the square root of the field energy stored in the resonator, whereby the proportionality factor depends on the shape of the resonator and the type of vibration, and the field energy stored per resonator is proportional to the throughput of the filter and the reciprocal of the relative bandwidth.
- bandpass filters are used in an input or output multiplexer, these individual filters are assigned different pass frequency ranges, which in their entirety determine the operating frequency range of the multiplexer.
- the typical relative bandwidth of a single filter is approximately 1%, while the entire operating frequency range is typically 20%. This means that for a filter with a passband at the lower end of the operating frequency range in the entire frequency range above this passband over a width of approximately 20%, no significant degradation of the blocking behavior may occur.
- This frequency range is considered for the following discussions In an analogous manner, for a filter with a passband at the upper end of the operating frequency range, the frequency range below this passband must be free of disturbances in the blocking behavior over a width of approximately 20%.
- TM010 vibration type desired for the operation of the filter is not the fundamental vibration type and therefore there are both undesired vibration types with resonance frequencies below and undesired vibration types with resonance frequencies above the resonance frequency of the TM010 vibration Vibration type lower resonance frequency is the TM210 vibration and the neighboring vibration type higher resonance frequency is TM310 vibration.
- the mutual spacing of the resonance frequencies of these vibration types depends on some geometry parameters of the resonators.
- the blocking behavior of a filter is degraded if the resonance frequency of an undesired vibration type is in the operating blocking range In the patent application DE 44 36 295 A1 there are no proposed solutions for this task.
- the required resonance frequencies of the individual resonators as well as the required coupling factors between the individual resonators are obtained from the given filter specifications.
- these setpoints are translated into geometry parameters of the structure ( Design values ") implemented.
- the filter realized according to this design exhibits behavior which deviates from the desired frequency response due to apoximation in the theoretical modeling and due to manufacturing and material deviations. It is therefore necessary, in particular for filters with a relatively small bandwidth, that the filter contains tuning elements that allow for a subsequent fine adjustment ( Allow trimming ") of the filter parameters.
- the invention has the technical object to provide a configuration for the planar superconducting resonators and the surrounding normally conductive housing, which allows a significant shift in the resonance frequencies of the undesired vibration types relative to the resonance frequency of the desired TM010 vibration and at the same time independent tuning of the resonance frequencies of each resonator and the coupling between the resonators. Furthermore, it is the object of the invention to provide coupling options between the connecting lines ( Toren ”) and the outer resonators of the filter, which do not significantly degrade the idle quality of the resonators.
- the design value of the respective coupling factor resulting from the filter specifications is realized by a suitable choice of the distance d and the coupling hole radius r i , a reduction in the distance d has the same effect as an increase in the coupling hole radius r i and thus a degree of freedom is retained for further optimization.
- the subsequent detunability of the coupling factor ( Trimming ") is achieved by introducing a low-loss dielectric insert into the coupling volume.
- the coupling factor can be changed by lateral displacement of the dielectric insert relative to the coupling hole.
- An essential part of the invention relates to the possibility of shifting the resonance frequencies of the undesired TM210 and TM310 vibrations relative to the frequency of the desired edge current-free TM010 vibration.
- the resonance frequency of the undesired TM210 oscillation is below that of the undesired TM310 oscillation above the resonance frequency of the TM010 oscillation.
- the distance between the resonance frequency of the TM210 oscillation and the resonance frequency of the desired oscillation can be increased from approx. 10% to approx. 25% , but the distance of the resonance frequency of the TM310 oscillation decreases from approx. 25% to almost 0%.
- these four-circle filters can consist of two filter pairs arranged side by side are formed, with adjacent resonators be coupled by additional structures.
- FIG. 1 shows a prior art (patent application DE 44 36 295 A1) corresponding superconducting individual resonator and housing. It consists of a single-crystalline substrate 1, for. B. from lanthanum aluminate or sapphire, on both sides of the superconducting conductor structures z. B. are applied from the high temperature superconductor YBa 2 Cu 3 O 7- ⁇ .
- the upper conductor layer 2 is structured in a circle with a radius r a .
- the lower conductor layer 3 has a circular recess (for the purpose of coupling with a second resonator arranged below it (not yet shown here) ( Coupling hole ”) with the radius r i .
- the resonator is provided with a housing cover 4, which can have, for example, the cylindrical shape shown in FIG. 1 and consist of normally conductive material such as copper etc. can.
- the TM 010 vibration type of Ring resonators are used to implement bandpass filters. With this type of vibration 2 (top) all current flow lines run in the radial direction. So there is none parallel current flow lines exist, there is also no through Current displacement effects caused current density increase at the edges. Compares such a superconducting resonator free of edge current with a edge-current resonator of approximately the same volume, it follows that by the Elimination of the edge currents means that the electromagnetic field energy is around 100 times higher can store without degradation of the superconducting properties.
- the desired TM 010 vibration type with the resonance frequency f 010 dependent, among other things, on the two radii r a and r i there are further vibration types on the ring resonator with a current flow line distribution which differs from that of the desired vibration type.
- the resonance frequencies of the undesired vibration types are also different from the resonance frequency of the desired TM010 vibration type.
- a filter bank e.g. B. the filter bank of an output multiplexer, it is necessary that either the resonance frequencies of all unwanted vibration types are outside the operating frequency range or that it is at least ensured that these vibration types are not excited.
- the invention described here includes a solution that allows one below explained design of the resonator and housing shape, the Resonance frequencies of the TM210 and the TM310 vibrations relative to the frequency of the desired vibration to vary within wide limits, so that in a filter bank with filters different pass frequency ranges in an operating frequency range up to typically 22% bandwidth in none of the filters an undesirable resonance occurs.
- the starting point of the solution to be described is the dependence of the resonance frequencies on the radius ratio shown in FIG. It can be seen that with small coupling holes (r i / r a small ”) the resonance frequency of the TM310 vibration is about 25% above, whereas the resonance frequency of the TM210 is only about 12% below the resonance frequency of the desired vibration. When the coupling hole is enlarged, the resonance frequency of the TM310 vibration approaches that of the desired vibration more and more , while the resonance frequency of the TM210 oscillation becomes smaller and moves up to approx. 26%. So if the ratio of the radii could be varied between very small values from approx. 0.05 to approx.
- a multiplexer with a bandwidth of approximately 22% could be realized by using resonators with a very small coupling hole for the filters in the lower frequency range and those with a relatively large coupling hole for filters in the upper frequency range, however, since the coupling holes to achieve sufficient coupling can not be chosen arbitrarily small to the neighboring resonators, this possibility is relative shift of the resonance frequencies alone is not sufficient.
- the problem described above is solved by the special shape of the housing shown in FIG. 4.
- the housing cover 1 is provided with a conical step ring 2 with the inner radius r G.
- opposite edge currents are induced by the edge-parallel edge currents of the undesired TM210 and TM310 in the conical part of the wall near the edge, which currents act on the streamline distribution of these vibration types in such a way that the streamlines towards the interior of the resonators are shifted. This reduces the effective diameter of the ring for the TM210 and TM310 vibrations and thus the resonance frequency of these vibrations.
- the essential parameters of the structure are the two radii r i and r a of the ring resonators, the distance between the resonators and the dimension of the conical step ring in the housing covers. These parameters can be obtained from the desired resonance frequencies and the desired coupling factor and from the requirement that the resonance frequencies of the unwanted vibrations be sufficiently spaced from the resonance frequency of the desired vibration. Regardless of this pre-dimensioning of the filter structure, there is generally a need to do the final fine tuning mechanically. A great advantage of the structure shown in Fig. 6 is that now that you can trim the resonance frequencies of the two individual resonators and the coupling factor almost independently.
- the coupling factor between the resonators can e.g. B. change in that one into the coupling area 1 between the resonators from the side a dielectric Insert 3 introduces.
- the coupling factor can be changed in the position of the coupling holes. The smaller the distance of the The center of the dielectric insert to the center of the coupling hole, the larger the Coupling factor.
- the resonance frequencies of the two ring resonators can be independent influence each other by looking in the area between resonator and cover a tuning screw, preferably a dielectric tuning screw with low Introduces losses with different immersion depths.
- Bandpasses that e.g. B. are used in output multiplexers of communications satellites, are typically constructed from 4 to 5 coupled resonators.
- Fig. 7 shows in a schematic way the possible structure of a 4-circuit bandpass (4 resonators).
- This 4-circuit bandpass is created by arranging 2 resonator pairs next to one another in accordance with FIG. 6.
- the front gate in "is coupled to the ring resonator A via the coupling structure 1.
- Ring resonator B is coupled to resonator A via the two coupling holes and the coupling volume 2. Details of this coupling between A and B can be found in FIG. 6. Coupling from resonator B to resonator C.
- resonator C and D takes place, for example, via a capacitive Cross coupling "3.
- the coupling between resonator C and D corresponds to that between A and B.
- Resonator D is via the coupling structure 5 with the output gate out ".
- the resonators A and B are also coupled, preferably via an inductive coupling 6.
- an equivalent circuit diagram for such a bandpass filter is shown, the numbering of the equivalent circuit elements corresponds to the designation of the individual functional units in the upper part of FIG. 7.
- FIG. 8 shows an example of a possible design of the coupling structures 1 and 5 from FIG. 7. These coupling structures take over the connection between the gates and the first or last resonator of the bandpass structure.
- these coupling structures take over the connection between the gates and the first or last resonator of the bandpass structure.
- the substrates of the ring resonator and the microstrip line can abut one another in the lateral direction, or, as shown in FIG. 8, one can be between the two substrates Gap "of width a exist.
- the one shown in FIG. 8 is used to achieve sufficient coupling between the microstrip line and the ring resonator capacitive bridge ". It consists of a conductor track 4 on a substrate 3.
- the substrate can be held via a housing part 5.
- the conductor track 4 on the capacitive bridge can consist of a homogeneous conductor track piece and a widening piece, as shown in FIG. 8, However, the strength of the coupling can be changed by varying the distance b between the conductor track 4 of the capacitive bridge and the conductor tracks of the ring resonator 1 or by varying the distance a between the substrate of the ring resonator and the In order to avoid degradation of the idling quality of the resonator due to losses in the coupling structure, it is advantageous to manufacture the conductor track 4 of the capacitive bridge and the conductor track of the microstrip line from high-temperature superconductor material in addition to the conductor track of the ring resonator 1.
- the coupling structure can also be shown on the same substrate as the ring resonator can be realized.
- Upper and lower part of FIG. 9 show two possible embodiments of such a coupling structure.
- the end of the microstrip line is one Fin "3 widened so that a slot capacitance 4 arises between the fin and the edge of the ring resonator.
- the dimensions of the slot are chosen so that the coupling factor corresponds to the value belonging to the respective filter specifications.
- Subsequent changes ( Trimming ") of the value of the coupling factor can be carried out with a dielectric screw 5 shown in FIG. 9 above.
- the strip conductor 2 of the microstrip line can be galvanically connected to the edge of the ring resonator 1 in the manner shown in the lower part of FIG. 9.
- a subsequent change ( Trimming ") of the coupling factor can be attached by moving one in the vicinity of the connection between the strip conductor and the resonator edge dielectric stamp "3 happen.
- resonators arranged side by side a capacitive cross coupling (3 in Fig. 7). This can, as shown in Fig. 10, as capacitive bridge between the two resonators.
- the capacitive bridge shown in FIG. 10 between 2 next to each other arranged resonators can be arranged in the case of a common substrate 11, in which the coupling structure between the two ring resonators 1 and 2 consists of a line segment 3 and two slot capacitors 4. Trim the Coupling is made possible via tuning screws 5.
- an inductive coupling between resonator A and resonator D (6 in FIG. 7) is required to implement a quasi-elliptical frequency response (damping poles at finite frequencies) of a bandpass.
- 12 shows a possible embodiment of such an inductive coupling.
- the 180 0 phase rotation necessary compared to the capacitive coupling is realized by a meandering line piece of suitable length on a capacitive bridge.
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Abstract
Description
Nachstehend ist die Erfindung anhand von Zeichnungen dargestellt, welche jedoch nur Ausführungsbeispiele darstellen. Es zeigen
- Fig.1
- einen Querschnitt durch einen einzelnen supraleitenden Ringresonator mit normalleitendem Gehäuse;
- Fig.2
- die Stromflußlinien für den erwünschten TM 010-Schwingungstyp sowie die beiden unerwünschten Schwingungstypen TM 210 und TM 310;
- Fig.3
- die Resonanzfrequenzen f210 und f310 der unerwünschen Schwingungstypen relativ zur Resonanzfrequenz f010 des erwünschten Schwingungstyps in Abhängigkeit vom Radienverhältnis des Ringresonators;
- Fig.4
- die erfindungsgemäße Gestaltung des Resonatorgehäuses mit kegelförmigem Stufenring zur Beeinflussung der Resonanzfrequenzen der unerwünschten Schwingungstypen;
- Fig.5
- die Resonanzfrequenzen f210 und f310 der unerwünschen Schwingungstypen relativ zur Resonanzfrequenz f010 des erwünschten Schwingungstyps in Abhängigkeit vom Durchmesser des kegelförmigen Stufenrings;
- Fig.6
- den Querschnitt eines zweiltreisigen Bandpaßfilters bestehend aus 2 Ringresonatoren mit der erfindungsgemäßen mechanisch abstimmbaren Kopplung zwischen den beiden Resonatoren;
- Fig.7
- den prinzipiellen Aufbau eines vierkreisigen Bandpaßfilters mit quasielliptischer Frequenzcharakteristik aus 4 supraleitenden Ringresonatoren;
- Fig.8
- eine Möglichkeit zur Ankopplung der äußeren Resonatoren eines Bandpaßfilters an die Tore mit Hilfe von kapazitiven Brücken, gezeigt in Draufsicht und im Querschnitt;
- Fig. 9
- zwei zu Fig. 8 alternative Möglichkeiten zur Ankopplung der äußeren Resonatoren eines Bandpaßfilters an die Tore mit Hilfe von Schlitzkapazitäten (oben) und auf galvanischem Wege (unten);
- Fig. 10
- eine mögliche Gestaltung der Verkopplung zwischen zwei nebeneinader angeordneten Ringresonatoren über eine kapazitive Brücke;
- Fig.11
- eine zu Fig. 10 alternative Gestaltung der Verkopplung zwischen zwei nebeneinader angeordneten Ringresonatoren mit Hilfe von Schlitzkapazitäten;
- Fig. 12
- eine mögliche Gestaltung der Verkopplung zwischen zwei nebeneinander angeordneten Ringresonatoren mit 180 Grad Phasendrehung.
Claims (14)
- Planarer Ringresonator mit Leiterbahnen aus supraleitfähigem Material, insbesondere einem Hochtemperatursupraleiter, welcher in einem randstromfreien TM010-Schwingungstyp betrieben wird, mit einem Gehäuse, dadurch gekennzeichnet, daß das Gehäuse so ausgebildet ist, daß die Innenwand des Gehäuses vom Rand der Leiterbahnen einen geringeren Abstand aufweist als von der Mitte der Leiterbahnen.
- Planarer Ringresonator nach Anspruch 1, dadurch gekennzeichnet, daß Abstimmelemente vorgesehen sind, die an der Innenwand des Gehäuses verschiebbar befestigt sind, daß Mittel vorgesehen sind, die Abstimmelemente an die Leiterbahnen anzunähern.
- Bandpaßfilter aus planaren Ringresonatoren mit Leiterbahnen aus hochtemperatursupraleitfähigem Material, welche in einem randstromfreien TM010-Schwingungstyp betrieben werden und teilweise übereinander und teilweise nebeneinander angeordnet werden, dadurch gekennzeichnet, daß Resonatoren in einer Struktur gemäß Fig. 6 so übereinander angeordnet werden und die Gehäusedeckel so gestaltet werden, daß Resonanzfrequenzen der Einzelresonatoren und Koppelfaktor zwischen den Resonatoren unabhängig voneinander verstimmbar (trimmbar") werden und daß durch Wahl der Radienverhältnisse ra/ri der Ringresonatoren und des Radius rG des kegelförmigen Stufenrings im Gehäuse die Resonanzfrequenzen der unerwünschten Schwingungstypen relativ zur Resonanzfrequenz des erwünschten Schwingungstyps bis ca. 22 % verschoben werden können.
- Bandpaßfilter nach Anspruch 3, dadurch gekennzeichnet, daß übereinander angeordnete Ringresonatoren entsprechend Fig. 6 auf den einander zugewandten Seiten eine durchgehende Leiterbahn mit kreisförmigem zentrischen Koppelloch vom Radius ri aufweisen und auf der abgewandten Seite kreisscheibenförmige Leiterbahnen mit Radius ra, so daß zwischen den Resonatoren ein mit Streufeld erfülltes Koppelvolumen entsteht und der Koppelfaktor sowohl durch den Radius ri des Koppellochs als auch durch den Abstand zwischen den Rückseiten der beiden Resonatoren bestimmt wird.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß durch Einbringen eines dielektrischen Einsatzes in das Koppelvolumen und Veränderung der Position dieses dielektrischen Einsatzes relativ zur Position der Koppellöcher der Koppelfaktor trimmbar ist.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß das normalleitende Gehäuse so gestaltet wird, daß den kreisförmigen Leiterbahnen der Resonatoren kegelförmige Stufenringe gegenüberstehen (Fig. 4) mit deren Hilfe die Resonanzfrequenzen der erwünschten TM210- und TM310-Schwingungstypen relativ zur Resonanzfrequenz des erwünschten TM010-Schwingungstyps erhöht werden können (Fig. 5) und somit durch Wahl des Radienverhältnisses am Ringresonator zusammen mit dem Radius rG des Stufenrings die Resonanzfrequenzen der unerwünschten Schwingungstypen in einen Bereich außerhalb des Betriebsfrequenzbereichs verschoben werden können.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß durch Einbringen von dielektrischen Abstimmschrauben (5 in Fig. 6) in den Volumenbereich oberhalb der kreisförmigen Leiterbahnen der Ringresonatoren deren Resonanzfrequenzen weitgehend unabhängig von deren Verkopplung abstimmbar sind.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß zur Realisierung einer vierkreisigen Version entsprechend Fig. 7 zwei Resonatorpaare entsprechend Fig. 6 nebeneinander angeordnet werden und die Resonatoren B und C kapazitiv und die Resonatoren A und D induktiv gekoppelt werden.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 8, dadurch gekennzeichnet, daß zur Vermeidung einer Degradation der Leerlaufgute die Anschlußleitung (
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß zur Vermeidung der Degradation der Leerlaufgüte die Anschlußleitung (
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 10, dadurch gekennzeichnet, daß zur Vermeidung einer De gradation der Leerlaufgüte die Anschlußleitung (
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 11, dadurch gekennzeichnet, daß die Querkopplung (3) in der Anordnung nach Fig. 7 entsprechend Fig. 10 als kapazitive Brücke mit supraleitender Leiterbahn ausgeführt wird.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 12, dadurch gekennzeichnet, daß die Querkopplung (3) in der Anordnung nach Fig. 7 entsprechend Fig. 11 über Koppelschlitze ausgeführt wird.
- Bandpaßfilter nach einem oder mehreren der Ansprüche 3 bis 13, dadurch gekennzeichnet, daß die Querkopplung (6) in der Anordnung nach Fig. 7 entsprechend Fig. 12 als kapazitive Brücke mit einer mäanderförmigen Umwegleitung ausgeführt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19723286A DE19723286A1 (de) | 1997-06-04 | 1997-06-04 | Vorrichtung zur Filterung von Hochfrequenzsignalen |
DE19723286 | 1997-06-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0883202A2 true EP0883202A2 (de) | 1998-12-09 |
EP0883202A3 EP0883202A3 (de) | 1999-11-03 |
Family
ID=7831290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98105698A Withdrawn EP0883202A3 (de) | 1997-06-04 | 1998-03-28 | Vorrichtung zur Filterung von Hochfrequenzsignalen |
Country Status (3)
Country | Link |
---|---|
US (1) | US6064895A (de) |
EP (1) | EP0883202A3 (de) |
DE (1) | DE19723286A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6252475B1 (en) * | 1998-06-17 | 2001-06-26 | Matsushita Electric Industrial Co. Ltd. | High-frequency circuit element |
JP3480381B2 (ja) * | 1999-08-24 | 2003-12-15 | 株式会社村田製作所 | 誘電体共振器装置、誘電体フィルタ、複合誘電体フィルタ装置、誘電体デュプレクサおよび通信装置 |
GB0006410D0 (en) * | 2000-03-16 | 2000-05-03 | Cryosystems | Electrical filters |
US6665476B2 (en) | 2000-09-29 | 2003-12-16 | Sarnoff Corporation | Wavelength selective optical add/drop multiplexer and method of manufacture |
US6985644B2 (en) * | 2002-04-26 | 2006-01-10 | T-Networks, Inc. | Semiconductor micro-resonator for monitoring an optical device |
US7749026B1 (en) * | 2009-06-24 | 2010-07-06 | Soontai Tech Co., Ltd. | Isolator |
US8884725B2 (en) * | 2012-04-19 | 2014-11-11 | Qualcomm Mems Technologies, Inc. | In-plane resonator structures for evanescent-mode electromagnetic-wave cavity resonators |
US9178256B2 (en) | 2012-04-19 | 2015-11-03 | Qualcomm Mems Technologies, Inc. | Isotropically-etched cavities for evanescent-mode electromagnetic-wave cavity resonators |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4436295A1 (de) * | 1994-08-19 | 1996-02-22 | Cryoelectra Ges Fuer Kryoelekt | Resonator |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6271305A (ja) * | 1985-09-24 | 1987-04-02 | Murata Mfg Co Ltd | 誘電体共振器 |
CA2073272C (en) * | 1991-07-08 | 1997-04-01 | Kenjiro Higaki | Microwave resonator of compound oxide superconductor material |
US5710105A (en) * | 1995-05-11 | 1998-01-20 | E. I. Du Pont De Nemours And Company | TM0i0 mode high power high temperature superconducting filters |
-
1997
- 1997-06-04 DE DE19723286A patent/DE19723286A1/de not_active Withdrawn
-
1998
- 1998-03-28 EP EP98105698A patent/EP0883202A3/de not_active Withdrawn
- 1998-05-07 US US09/074,108 patent/US6064895A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4436295A1 (de) * | 1994-08-19 | 1996-02-22 | Cryoelectra Ges Fuer Kryoelekt | Resonator |
Non-Patent Citations (1)
Title |
---|
CHALOUPKA H ET AL: "SUPERCONDUCTING PLANAR DISK RESONATORS AND FILTERS WITH HIGH POWER HANDLING CAPABILITY" ELECTRONICS LETTERS, Bd. 32, Nr. 18, 29. August 1996 (1996-08-29), Seiten 1735-1737, XP000637862 ISSN: 0013-5194 * |
Also Published As
Publication number | Publication date |
---|---|
US6064895A (en) | 2000-05-16 |
EP0883202A3 (de) | 1999-11-03 |
DE19723286A1 (de) | 1998-12-10 |
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