[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO1994005022B1 - Superconducting control elements for rf antennas - Google Patents

Superconducting control elements for rf antennas

Info

Publication number
WO1994005022B1
WO1994005022B1 PCT/US1993/007701 US9307701W WO9405022B1 WO 1994005022 B1 WO1994005022 B1 WO 1994005022B1 US 9307701 W US9307701 W US 9307701W WO 9405022 B1 WO9405022 B1 WO 9405022B1
Authority
WO
WIPO (PCT)
Prior art keywords
superconducting
tines
capacitor
high temperature
substrate
Prior art date
Application number
PCT/US1993/007701
Other languages
French (fr)
Other versions
WO1994005022A1 (en
Filing date
Publication date
Priority claimed from US07/934,921 external-priority patent/US6335622B1/en
Application filed filed Critical
Publication of WO1994005022A1 publication Critical patent/WO1994005022A1/en
Publication of WO1994005022B1 publication Critical patent/WO1994005022B1/en

Links

Abstract

Control elements for RF antennas including high temperature superconducting capacitors (24) are formed. In one embodiment, a high temperature superconducting capacitor (24) is coupled to an inductor (22) to form a resonant circuit (20). In another embodiment a high temperature superconducting capacitor (32) is used to make a low-resistance cross-over (33) for an inductor (31). Additional circuits include circuits which do not use non-superconducting materials in the circuit, circuits which have coupled superconducting inductors (50, 51) for low-loss signal coupling, tuning and bandwidth broadening, and circuits which include switches to shut off the superconductivity of a superconductive element including low-loss photoconducting (70) and superconducting thermal (61) switches. These circuits are useful in Magnetic Resonance Imaging devices.

Claims

AMENDED CLAIMS
[received by the International Bureau on 2 February 1994 (02.02.94); original claims 3 and 4 cancelled; original claims 1 and 2 amended; new claims 25-31 added; remaining claims unchanged (2 pages)]
1. A high temperature superconducting capacitor comprising a first superconducting plate member and a second superconducting plate member, wherein the first superconducting plate member is hybridized to the second superconducting plate member and a dielectric is positioned between the first and second superconducting plate members.
2. A high temperature superconducting capacitor comprising a first superconducting plate member and a second superconducting plate member fabricated on a substrate and separated by a dielectric wherein the substrate comprises a dielectric and has a surface, the first superconducting plate member comprises a plurality of tines extending along the surface of the substrate, and the second superconducting plate member comprises a plurality of tines extending along the surface of the substrate and interspersed between the tines of the first plate member with substrate separating the tines of the first plate member and the tines of the second plate member.
5. A superconducting resonant circuit comprising an inductor and a high temperature superconducting capacitor.
6. A superconducting resonant circuit of claim 5 wherein the superconducting capacitor comprises 25. A high temperature superconducting capacitor comprising first and second superconducting plate members, and a dielectric having a first surface to which the first plate member is hybridized and having a second surface to which the second plate member is hybridized wherein the dielectric separates the first and second plate members.
26. A high temperature superconducting capacitor comprising a first superconducting member fabricated on a substrate, said first superconducting member having a plurality of tines extending along a surface of the substrate, a second superconducting member fabricated on the substrate, said second superconducting member having a plurality of tines extending along the surface of the substrate and interspersed between the tines of the first superconducting member with substrate separating the tines of the first superconducting member and the tines of the second superconducting member.
27. The high temperature superconducting capacitor of claim 26 wherein the substrate comprises a dielectric.
28. The high temperature superconducting capacitor of claim 26 wherein the surface of the substrate is planer.
29. The high temperature superconducting capacitor of claim 26 wherein the tines of the first and second superconducting members includes one or more tines having a length and a width wherein the length is at least about 250 times the width.
30. The high temperature superconducting capacitor of claim 29 wherein the length is at least about 800 times the width. 31. The high temperature superconducting capacitor of claim 29 wherein the length is at least about 1600 times the width. STATEMENTUNDERARTICLE 19
Claim 1 is amended, Claims 3 and 4 are cancelled, and Claims 25-31 have been added, to designate over the patents cited by the Examiner. Applicant hereby brings to the attention of the Examiner the enclosed U.S. Patent No. 5,231,078 to Riebman, e_t al. Although this patent may be pertinent to the art of the present invention, it does not disclose the invention as presently claimed.
The Examiner cites several patents as disclosing the superconductive capacitor plate structure of the present invention. However, neither Riebman nor any of the patents cited by the Examiner include superconducting plates, at least one of which is hybridized, as required in Claims 1 and 25.
In addition, none of the patents cited by the Examiner includes interspersed structures having superconducting tines which lie along the same surface as do the superconducting members, as required in Claims 2 and 26-31. Ruby, U.S. Pat. No. 5,061,686, is the only citation which was cited as a superconductive device having an interdigitated structure. However, Ruby does not show a structure as is presently claimed.
The Ruby device as shown in figures 4 and 5, has a trace structure 36 and 38 which includes interdigitated fingers 40 and 42, and has a capacitor member 26 which includes superconductive plates 54 and 56 separated by dielectric 52. However, as is shown in figure 5, the interdigitated fingers 40 and 42 are merely structural features to allow multiple connections to each plate 54 and 56 by means of vias 48 and 50. In addition, the interdigitated fingers 40 and 42 are separated from the plates 54 and 56 by a support member 24.
The invention of the present application is a significant improvement over the device of Ruby 5,061,686. Ruby does not disclose an interspersed structure which includes superconducting tines which lie along the same surface as do the superconducting members. In addition, neither Ruby nor any of the patents cited by the Examiner show a pair of interspersed tines having lengths at least about 250 times their widths as is required by Claims 29-31.
The invention of the present application is not suggested or shown in the patents cited by the Examiner or the patent cited by the applicant.
PCT/US1993/007701 1992-08-25 1993-08-16 Superconducting control elements for rf antennas WO1994005022A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/934,921 1992-08-25
US07/934,921 US6335622B1 (en) 1992-08-25 1992-08-25 Superconducting control elements for RF antennas

Publications (2)

Publication Number Publication Date
WO1994005022A1 WO1994005022A1 (en) 1994-03-03
WO1994005022B1 true WO1994005022B1 (en) 1994-03-31

Family

ID=25466274

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/007701 WO1994005022A1 (en) 1992-08-25 1993-08-16 Superconducting control elements for rf antennas

Country Status (2)

Country Link
US (5) US6335622B1 (en)
WO (1) WO1994005022A1 (en)

Families Citing this family (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6335622B1 (en) * 1992-08-25 2002-01-01 Superconductor Technologies, Inc. Superconducting control elements for RF antennas
US5565778A (en) * 1992-06-01 1996-10-15 Conductus, Inc. Nuclear magnetic resonance probe coil
US5585723A (en) * 1995-03-23 1996-12-17 Conductus, Inc. Inductively coupled superconducting coil assembly
US5594342A (en) * 1992-06-01 1997-01-14 Conductus, Inc. Nuclear magnetic resonance probe coil with enhanced current-carrying capability
JP2871516B2 (en) * 1995-03-22 1999-03-17 株式会社移動体通信先端技術研究所 Oxide superconducting thin film device
WO1998025163A1 (en) * 1996-12-02 1998-06-11 The Trustees Of Columbia University In The City Of New York Multiple resonance superconducting probe
US6586309B1 (en) * 2000-04-24 2003-07-01 Chartered Semiconductor Manufacturing Ltd. High performance RF inductors and transformers using bonding technique
US6377047B1 (en) * 2000-06-08 2002-04-23 Varian, Inc. Superconducting birdcage coils
EP1311006A4 (en) * 2000-07-24 2007-07-25 Matsushita Electric Ind Co Ltd Thin-film piezoelectric element
JP4122833B2 (en) * 2002-05-07 2008-07-23 株式会社日立製作所 Probe for NMR apparatus using magnesium diboride
US7521932B2 (en) * 2003-05-06 2009-04-21 The Penn State Research Foundation Method and system for adjusting the fundamental symmetric mode of coupled high temperature superconductor coils
US20040231137A1 (en) * 2003-05-20 2004-11-25 Derek Seeber Method of manufacturing local coils using pre-tuned non-magnetic circuitry modules
US20050104593A1 (en) * 2003-08-21 2005-05-19 Laubacher Daniel B. Nuclear quadrupole resonance detection system using a high temperature superconductor self-resonant coil
US7295085B2 (en) * 2003-08-21 2007-11-13 E.I. Du Pont De Nemours And Company Process for making high temperature superconductor devices each having a line oriented in a spiral fashion
US7148684B2 (en) 2003-10-23 2006-12-12 E.I. Du Pont De Nemours And Company Method for biological identification using high temperature superconductor enhanced nuclear quadrupole resonance
US7106058B2 (en) 2003-11-12 2006-09-12 E.I. Dupont De Nemours And Company Detection of contraband using nuclear quadrupole resonance
US7301344B2 (en) 2003-11-24 2007-11-27 E.I. Du Pont De Nemours & Co. Q-damping circuit including a high temperature superconductor coil for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system
US20070245374A1 (en) 2003-11-24 2007-10-18 Inventec Corporation Video program subtitle tex recording method and system
US7332910B2 (en) * 2003-11-24 2008-02-19 E.I. Du Pont De Nemours And Company Frequency detection system comprising circuitry for adjusting the resonance frequency of a high temperature superconductor self-resonant coil
WO2005059582A1 (en) * 2003-12-15 2005-06-30 E.I. Dupont De Nemours And Company The use of multiple sensors in a nuclear quadrupole resonance detection system to improve measurement speed
WO2005078469A1 (en) 2004-02-04 2005-08-25 E.I. Dupont De Nemours And Company The use of two or more sensors to detect different nuclear quadrupole resonance signals of a target compound
WO2005109023A2 (en) 2004-02-04 2005-11-17 E.I. Dupont De Nemours And Company Nqr rf coil assembly comprising two or more coils which may be made from hts
US7248046B2 (en) * 2004-04-15 2007-07-24 E. I. Du Pont De Nemours And Company Decoupling high temperature superconductor sensor arrays in nuclear quadrupole resonance detection systems
US7265549B2 (en) * 2004-04-30 2007-09-04 E. I. Du Pont De Nemours And Company Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to the same frequency
EP1740967A2 (en) * 2004-04-30 2007-01-10 E.I.Du pont de nemours and company Methods and apparatus for scanning a band of frequencies using an array of high temperature superconductor sensors
US7279897B2 (en) 2004-04-30 2007-10-09 E. I. Du Pont De Nemours And Company Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to different frequencies
WO2006030332A2 (en) 2004-09-16 2006-03-23 Koninklijke Philips Electronics N.V. Magnetic resonance receive coils with compact inductive components
US8035382B2 (en) * 2004-11-23 2011-10-11 m2m Imaging Corporation Coil decoupling in magnetic resonance imaging
JP4647984B2 (en) * 2004-12-02 2011-03-09 株式会社日立製作所 Nuclear magnetic resonance probe coil
EP1828797A1 (en) * 2004-12-03 2007-09-05 E.I. Dupont De Nemours And Company Decoupling of excitation and receive coils of an nqr detection system during signal reception
WO2006065929A1 (en) * 2004-12-13 2006-06-22 E. I. Du Pont De Nemours And Company Metal shield alarm in a nuclear quadrupole resonance/x-ray contraband detection system
US20090027280A1 (en) * 2005-05-05 2009-01-29 Frangioni John V Micro-scale resonant devices and methods of use
US20070007844A1 (en) * 2005-07-08 2007-01-11 Levitronics, Inc. Self-sustaining electric-power generator utilizing electrons of low inertial mass to magnify inductive energy
DE102006009043B4 (en) * 2006-02-27 2008-10-30 Siemens Ag Radio-frequency antenna arrangement for detecting a magnetic resonance signal and magnetic resonance system with such a radio-frequency antenna arrangement
US20070262776A1 (en) * 2006-05-10 2007-11-15 Petropoulos Labros S Magnetic Resonance Imaging Magnet Assembly System with Improved Homogeneity
JP2007322361A (en) * 2006-06-05 2007-12-13 Hitachi Ltd Nuclear magnetic resonance device and probe for same
DE102006042996A1 (en) * 2006-09-13 2007-10-04 Siemens Ag Antenna for magnetic resonance application, has conductor loop oscillating high frequency current in current flow direction during operation of antenna and divided into loop sections in current flow direction
EP1918730B1 (en) * 2006-10-26 2013-05-15 Bruker BioSpin AG NMR apparatus with a microfluidic NMR chip
DE102006053472B4 (en) * 2006-11-14 2009-12-10 Bruker Biospin Ag Method for producing a tuned RF resonator system
US20090322332A1 (en) * 2007-03-28 2009-12-31 Varian, Inc. NMR probe superconductive transmit/receive switches
US8299572B2 (en) * 2007-06-20 2012-10-30 Skyworks Solutions, Inc Semiconductor die with backside passive device integration
US7791339B2 (en) * 2007-09-07 2010-09-07 Varian, Inc. RF-switched superconducting resonators and methods of switching thereof
US8238989B2 (en) * 2008-08-28 2012-08-07 Hong Kong Applied Science And Technology Research Institute Co., Ltd. RF component with a superconducting area having higher current density than a non-superconducting area
US8970217B1 (en) 2010-04-14 2015-03-03 Hypres, Inc. System and method for noise reduction in magnetic resonance imaging
WO2014135749A1 (en) * 2013-03-05 2014-09-12 Teknologian Tutkimuskeskus Vtt Superconducting thermal detector (bolometer) of terahertz (sub-millimeter wave) radiation
WO2015050528A1 (en) * 2013-10-01 2015-04-09 Intel Corporation Mechanism for generating a hybrid communication circuitry for facilitating hybrid communication between devices
US9305194B2 (en) 2014-03-27 2016-04-05 Intel Corporation One-touch input interface
US10333200B2 (en) 2015-02-17 2019-06-25 Samsung Electronics Co., Ltd. Portable device and near field communication chip
KR20170086328A (en) * 2016-01-18 2017-07-26 삼성전자주식회사 Local coil apparatus, magnetic resonance imaging apparatus, and control method of the local coil apparatus
US11109451B2 (en) 2016-07-20 2021-08-31 Kymeta Corporation Internal heater for RF apertures
US11070123B2 (en) * 2017-07-07 2021-07-20 The Boeing Compan Energy storage and energy storage device
US11715871B2 (en) * 2019-12-17 2023-08-01 Kymeta Corporation Iris heater structure for uniform heating

Family Cites Families (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764938A (en) * 1972-08-28 1973-10-09 Bell Telephone Labor Inc Resonance suppression in interdigital capacitors useful as dc bias breaks in diode oscillator circuits
FR2220929B1 (en) 1973-02-20 1976-06-11 Minet Roger
US4409608A (en) * 1981-04-28 1983-10-11 The United States Of America As Represented By The Secretary Of The Navy Recessed interdigitated integrated capacitor
US4692705A (en) * 1983-12-23 1987-09-08 General Electric Company Radio frequency field coil for NMR
US4765055A (en) * 1985-08-26 1988-08-23 The Furukawa Electric Co., Ltd. Method of fabricating a superconducting cavity
JPH0618197B2 (en) * 1987-07-30 1994-03-09 日本電気株式会社 Superconducting monolithic microwave integrated circuit
US4827536A (en) * 1987-11-12 1989-05-09 Sung Henry H Necktie with holding means
US4918049A (en) * 1987-11-18 1990-04-17 Massachusetts Institute Of Technology Microwave/far infrared cavities and waveguides using high temperature superconductors
US4881034A (en) * 1988-01-19 1989-11-14 The Regents Of The University Of California Switchable MRI RF coil array with individual coils having different and overlapping fields of view
US4869598A (en) * 1988-03-11 1989-09-26 Mcdonald Donald G Temperature-sensitive multiple-layer thin film superconducting device
US4981838A (en) * 1988-03-17 1991-01-01 The University Of British Columbia Superconducting alternating winding capacitor electromagnetic resonator
US4918050A (en) * 1988-04-04 1990-04-17 Motorola, Inc. Reduced size superconducting resonator including high temperature superconductor
US4872086A (en) * 1988-10-20 1989-10-03 Motorola, Inc. Dielectric RF devices suited for use with superconductors
US5036042A (en) * 1988-12-29 1991-07-30 International Superconductor Corp. Switchable superconducting mirrors
US5075281A (en) * 1989-01-03 1991-12-24 Testardi Louis R Methods of making a high dielectric constant, resistive phase of YBA2 CU3 OX and methods of using the same
US5061686A (en) * 1989-05-15 1991-10-29 Hewlett-Packard Company Superconducting power distribution structure for integrated circuits
US5097128A (en) * 1989-07-31 1992-03-17 Santa Barbara Research Center Superconducting multilayer architecture for radiative transient discrimination
JPH03286601A (en) * 1990-04-03 1991-12-17 Res Dev Corp Of Japan Microwave resonator
US5260398A (en) * 1990-04-05 1993-11-09 The Dow Chemical Company Aromatic cyanate-siloxane
FR2662856B1 (en) * 1990-06-01 1997-01-24 Thomson Csf TUNABLE HIGH FREQUENCY DEVICES.
US5168230A (en) * 1990-08-17 1992-12-01 General Electric Dual frequency nmr surface coil pair with interleaved lobe areas
US5215959A (en) * 1990-09-21 1993-06-01 University Of California, Berkeley Devices comprised of discrete high-temperature superconductor chips disposed on a surface
US5231327A (en) * 1990-12-14 1993-07-27 Tfr Technologies, Inc. Optimized piezoelectric resonator-based networks
ES2120951T3 (en) * 1991-03-26 1998-11-16 Mars Inc DEVICE FOR THE DETECTION OF THE PRESENCE AND / OR FOR THE DETERMINATION OF THE APPEARANCE OF A MAGNETIC SUBSTANCE, EVEN IN SMALL AMOUNTS.
US6335622B1 (en) * 1992-08-25 2002-01-01 Superconductor Technologies, Inc. Superconducting control elements for RF antennas
US5328893A (en) 1991-06-24 1994-07-12 Superconductor Technologies, Inc. Superconducting devices having a variable conductivity device for introducing energy loss
CA2073272C (en) 1991-07-08 1997-04-01 Kenjiro Higaki Microwave resonator of compound oxide superconductor material
US5231078A (en) * 1991-09-05 1993-07-27 Ael Defense Corp. Thin film superconducting LC network
US5276398A (en) 1992-06-01 1994-01-04 Conductus, Inc. Superconducting magnetic resonance probe coil
US5594342A (en) * 1992-06-01 1997-01-14 Conductus, Inc. Nuclear magnetic resonance probe coil with enhanced current-carrying capability
US5585723A (en) * 1995-03-23 1996-12-17 Conductus, Inc. Inductively coupled superconducting coil assembly
US5565778A (en) * 1992-06-01 1996-10-15 Conductus, Inc. Nuclear magnetic resonance probe coil
US5472935A (en) * 1992-12-01 1995-12-05 Yandrofski; Robert M. Tuneable microwave devices incorporating high temperature superconducting and ferroelectric films
US5682128A (en) * 1996-04-23 1997-10-28 Illinois Superconductor Corporation Superconducting reentrant resonator
US5888942A (en) * 1996-06-17 1999-03-30 Superconductor Technologies, Inc. Tunable microwave hairpin-comb superconductive filters for narrow-band applications
US7047059B2 (en) * 1998-08-18 2006-05-16 Quantum Magnetics, Inc Simplified water-bag technique for magnetic susceptibility measurements on the human body and other specimens
WO1998025163A1 (en) * 1996-12-02 1998-06-11 The Trustees Of Columbia University In The City Of New York Multiple resonance superconducting probe
US6198284B1 (en) * 1997-04-14 2001-03-06 Doty Scientific Inc. High power flexible leads for DAS NMR
US5949311A (en) * 1997-06-06 1999-09-07 Massachusetts Institute Of Technology Tunable resonators
US5882128A (en) * 1997-09-02 1999-03-16 Hewlett-Packard Company Self-adjusting wheel for directly positioning and holding media during a cutting operation in a printer
US6025719A (en) * 1997-11-07 2000-02-15 Varian, Inc. Nuclear magnetic resonance method and apparatus
US6347237B1 (en) * 1999-03-16 2002-02-12 Superconductor Technologies, Inc. High temperature superconductor tunable filter
EP1230559A2 (en) * 1999-05-21 2002-08-14 The General Hospital Corporation Rf coil for imaging system
US6377047B1 (en) * 2000-06-08 2002-04-23 Varian, Inc. Superconducting birdcage coils
EP1344076A1 (en) * 2000-10-09 2003-09-17 Regents Of The University Of Minnesota Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils
DE10056807A1 (en) * 2000-11-16 2002-05-23 Philips Corp Intellectual Pty HF planar resonator for transmitting/receiving circularly polarized electromagnetic waves has conductor structures stretching from a central area in radial directions and a conductor loop around this area for a return current.
US6420871B1 (en) * 2001-03-02 2002-07-16 Varian, Inc. Multiple tuned birdcage coils
US6556013B2 (en) * 2001-03-09 2003-04-29 Bruker Biospin Corp. Planar NMR coils with localized field-generating and capacitive elements
US6771070B2 (en) * 2001-03-30 2004-08-03 Johns Hopkins University Apparatus for magnetic resonance imaging having a planar strip array antenna including systems and methods related thereto
DE10150131C2 (en) * 2001-10-11 2003-10-09 Bruker Biospin Ag Faellanden RF receiver coil arrangement for an NMR resonator with macroscopically homogeneous distribution of the conductor structures
DE10157972B4 (en) * 2001-11-27 2004-01-08 Bruker Biospin Ag NMR spectrometer and operating method with stabilization of the transverse magnetization in superconducting NMR resonators
US7088104B2 (en) * 2001-12-31 2006-08-08 The John Hopkins University MRI tunable antenna and system
US6700459B2 (en) * 2002-05-29 2004-03-02 Superconductor Technologies, Inc. Dual-mode bandpass filter with direct capacitive couplings and far-field suppression structures
US6894584B2 (en) * 2002-08-12 2005-05-17 Isco International, Inc. Thin film resonators
US7560927B2 (en) * 2003-08-28 2009-07-14 Massachusetts Institute Of Technology Slitted and stubbed microstrips for high sensitivity, near-field electromagnetic detection of small samples and fields
KR101192907B1 (en) * 2004-07-23 2012-10-18 더 리젠트스 오브 더 유니이버시티 오브 캘리포니아 Metamaterials
US7514926B2 (en) * 2005-11-14 2009-04-07 Regents Of The University Of Minnesota Spatially reconfigurable magnetic resonance coil
US7420371B2 (en) * 2006-01-04 2008-09-02 Enh Research Institute Slab-selective RF coil for MR system
US7446534B2 (en) * 2006-12-20 2008-11-04 Varian, Inc. Cold normal metal and HTS NMR probe coils with electric field shields

Similar Documents

Publication Publication Date Title
WO1994005022B1 (en) Superconducting control elements for rf antennas
US6529750B1 (en) Microstrip filter cross-coupling control apparatus and method
CA2161686C (en) High temperature superconductor lumped elements and circuit
US6538445B2 (en) Superconducting control elements for RF antennas
JP4021844B2 (en) Tunable ferroelectric resonator device
US5616539A (en) High temperature superconductor lumped element band-reject filters
US5589845A (en) Tuneable electric antenna apparatus including ferroelectric material
US5616538A (en) High temperature superconductor staggered resonator array bandpass filter
US6216020B1 (en) Localized electrical fine tuning of passive microwave and radio frequency devices
US6041245A (en) High power superconductive circuits and method of construction thereof
WO1994013028A1 (en) Tunable microwave devices incorporating high temperature superconducting and ferroelectric films
US20030222732A1 (en) Narrow-band filters with zig-zag hairpin resonator
WO1994028627A9 (en) High temperature superconductor lumped elements and circuit
US6792299B2 (en) Device approximating a shunt capacitor for strip-line-type circuits
US5488382A (en) Low noise amplifier
WO1994028592A1 (en) High tc superconductor/ferroelectric tunable microwave circuits
EP0567407A1 (en) Microwave component of oxide superconducter material
US6014575A (en) Superconducting transmission line phase shifter having a V3 Si superconductive signal line
WO1996003737A1 (en) Computer data entry apparatus
EP0787362B1 (en) Concentrated component and a high-frequency circuit containing such a component
US20030151466A1 (en) Elliptical resonators and radio frequency filter formed therefrom
DE4434416C1 (en) High frequency microwave SQUID device with flow focussing structure
WO1996010190A1 (en) High-frequency squid with a resonant flow-focusing structure