| Patent Number |
Title Of Patent |
Date Issued |
| 6501353 |
Duplexed front-end for a radio transceiver system |
December 31, 2002 |
| A system having a transmit path and a receive path coupled to an antenna includes a cryostat, a receive filter disposed in the cryostat, a transmit filter disposed outside of the cryostat and in the transmit path, and a coupler that couples the antenna and the receive filter. The coupler |
| 6208227 |
Electromagnetic resonator |
March 27, 2001 |
| An electromagnetic resonator has a resonant element made of a high-temperature superconducting material such as YBa.sub.2 Cu.sub.3 O.sub.7-x. The resonant element has a substrate coated with a thermally conductive layer such as silver, over which the high-temperature superconductor m |
| 6137381 |
Aperture having first and second slots for coupling split-ring resonators |
October 24, 2000 |
| An electromagnetic filter includes a filter housing containing a first resonant cavity and a second resonant cavity. Resonators are disposed within each of the cavities. The electromagnetic filter also includes a cavity wall separating the first resonant cavity and the second resonant |
| 6119025 |
Method of producing an electromagnetic signal |
September 12, 2000 |
| A method of producing ceramic superconducting materials such as YBa.sub.2 Cu.sub.3 O.sub.x includes blending together starting materials for the superconducting material. The blend of starting materials are formed into a layer and sintered at a temperature above the peritectic temperatur |
| 6083883 |
Method of forming a dielectric and superconductor resonant structure |
July 4, 2000 |
| A resonant structure has a center conductor, a dielectric element, and an outer conductor. The center conductor is a substrate with a coating of a superconductor on its outer surface, and the outer conductor is a substrate with a coating of a superconductor on its inner surface. The |
| 6021337 |
Stripline resonator using high-temperature superconductor components |
February 1, 2000 |
| A stripline resonator has a center conductor between layers of dielectric which are, in turn, between ground planes. The center conductor is made of a high-temperature superconducting material, preferably having a total superconductor thickness from at least about one micron to at least |
| 5987341 |
High-purity polycrystalline alumina cryogenic dielectric |
November 16, 1999 |
| An electromagnetic device, such as a resonator for a filter, incorporates a high-purity polycrystalline alumina. The device may include a superconducting component, which must be cooled significantly below room temperature. The high-purity polycrystalline alumina may be a dielectric |
| 5941080 |
Thin-walled cryostat |
August 24, 1999 |
| A cryostat includes an upper shell and a lower shell connected along a seam. The shells are made of a relatively thin material which would be subject to collapse once the cryostat is evacuated. In order to resist collapsing forces, a brace is placed inside the cryostat between opposing |
| 5932522 |
Superconducting radio-frequency bandstop filter |
August 3, 1999 |
| A bandstop filter contains one or more resonant circuits connected by interconnecting transmission lines. The resonant circuits each have a transmission line connected between two capacitors. One capacitor is connected to the interconnecting transmission line and the other capacitor |
| 5889448 |
Resonator mounting mechanism |
March 30, 1999 |
| A resonator mounting mechanism includes a stand having a groove in the head of the stand. A cap, which also has a groove, fits over the top of the stand to hold a resonator in place. The stand has two slots formed between lugs, which receive arms on the cap. The sidewalls of the lugs for |
| 5871818 |
Thick film coating process |
February 16, 1999 |
| A coating device for use in coating circular cross-sectioned substrates has a semi-circular doctor blade. The coater may also have a plate for holding axially symmetric substrates which can be rotated about an axis. A groove in the plate centers the substrate on the plate for rotation. T |
| 5859576 |
Extended spring loaded tuner |
January 12, 1999 |
| A tuner including a shaft extendible through an aperture extending completely through a jacket of the tuner. The tuner includes a shaft tensioning and grounding structure and a tuning material holder comprising a cup-shaped structure with a clasping element. |
| 5856277 |
Surface texturing of superconductors by controlled oxygen pressure |
January 5, 1999 |
| A method of manufacture of a textured layer of a high temperature superconductor on a substrate. The method involves providing an untextured high temperature superconductor material having a characteristic ambient pressure peritectic melting point, heating the superconductor to a tem |
| 5853198 |
Thermal attachment device |
December 29, 1998 |
| A mechanical coupling device for selectively connecting and disconnecting an apparatus to a thermal source. The coupling device includes a thermal bridge element comprised of a flexible structure having a first coefficient of thermal expansion, and a thermal stress element disposed a |
| 5847627 |
Bandstop filter coupling tuner |
December 8, 1998 |
| A resonant structure and filter include a resonant element mounted to the cover of a housing. A transmission line passes through the cover and is connected to a coupling loop. The coupling loop is located adjacent the resonator and is connected to ground. A coupling tuner is attached to |
| 5843871 |
Electromagnetic filter having a transmission line disposed in a cover of the filter housing |
December 1, 1998 |
| An electromagnetic filter has a unitary filter body defining a number of cavities. A cover for the filter body has several resonators attached to it which are located in the cavities when the cover is attached to the filter body. The cover has a recess into which a transmission line is |
| 5838213 |
Electromagnetic filter having side-coupled resonators each located in a plane |
November 17, 1998 |
| An electromagnetic filter includes a plurality of dielectrically-loaded split-ring resonators. The resonators are oriented side-by-side generally within a single plane to achieve side-coupling. The side-coupled orientation of the resonators allows adjacent resonators to be set apart |
| 5828944 |
Diversity reception signal processing system |
October 27, 1998 |
| A signal receiving system has an antenna assembly divided into sectors. Each sector employs diversity by having at least two antennae for receiving signals from that sector. Signals from the antennae are passed to filters where the filters contain superconductors requiring cooling. T |
| 5789347 |
Method of producing high-temperature superconducting materials |
August 4, 1998 |
| A method of producing ceramic superconducting materials such as YBa.sub.2 Cu.sub.3 O.sub.x includes blending together starting materials for the superconducting material. The blend of starting materials are formed into a layer and sintered at a temperature above the peritectic temperatur |
| 5761017 |
High temperature superconductor element for a fault current limiter |
June 2, 1998 |
| A high temperature superconductor fault current limiter and a method of using same. The fault current limiter comprises a high temperature superconductor material structure at least partially encapsulated in an epoxy having thermal conductivity properties that enable the superconduct |
| 5744945 |
Cryogenic fluid-level sensor |
April 28, 1998 |
| A method of measuring a cryogenic fluid level utilizing a high temperature ceramic superconductor material driven above its level of critical current density. A high temperature ceramic superconductor is placed in cryogenic fluid and a voltage is applied between two points on the superco |
| 5731269 |
Mechanically adjustable coupling loop for a resonator |
March 24, 1998 |
| An adjustable coupler for coupling electromagnetic energy into or out of a resonant cavity has an input/output line connected to a loop or conductor. A base of the coupler has a passageway into which a bolt is inserted. Threads on a bolt engage threads on a nut attached to the conductor. |
| 5682128 |
Superconducting reentrant resonator |
October 28, 1997 |
| A reentrant resonator has a center conductor fixed to an end wall and surrounded by side walls of a housing, where end walls, side walls, and center conductors are all coated with a high-temperature superconducting material. The end walls, side walls, and center conductors are shaped so |
| 5629266 |
Electromagnetic resonator comprised of annular resonant bodies disposed between confinement plat |
May 13, 1997 |
| Electromagnetic resonators according to the invention comprise a first body, exemplarily a split thin ring, that is disposed between two planar field confining plates. The thickness (t) of the first body is less (typically less than 1/2 or 1/10) of the outer radius (R) of the body, |
| 5616540 |
Electromagnetic resonant filter comprising cylindrically curved split ring resonators |
April 1, 1997 |
| A filter for processing electromagnetic signals has a housing with resonators located inside the cavity of that housing. The resonators, which may be made in part from superconducting material, have rounded exterior surfaces without corners to provide a more desirable coating surface |
| 5604472 |
Resonator mounting mechanism |
February 18, 1997 |
| A resonator mounting mechanism has a stand which can be attached to a wall. The stand has two wings and a groove in between the wings. A cap also has wings and a groove in between the wings where the cap is placed over the stand so that the grooves form an opening for receiving a resonat |
| 5527765 |
Superconducting YBa.sub.2 Cu.sub.3 O.sub.7-x produced at low temperatures |
June 18, 1996 |
| A high temperature superconductor and composite structure. A superconductor is disposed on a silver substrate without interdiffusion. The superconductor is formed by heating to a temperature not exceeding the peritectic point of the superconductor material, providing an oxidizing atm |
| 5432666 |
Self-restoring fault current limiter utilizing high temperature superconductor components |
July 11, 1995 |
| A fault current limiter incorporating a high temperature superconductor material. During a fault condition, the superconductor material is allowed to operate above its critical temperature, providing sharply increased resistance. The fault current limiter can be sized and selectively coo |
| 5393736 |
Cryogenic fluid level sensor |
February 28, 1995 |
| A cryogenic fluid level sensor utilizing a high temperature ceramic superconductor material driven above its level of critical current density, an exterior housing for holding the length of ceramic superconductor material, a support material disposed between the ceramic superconducto |
| 5340797 |
Superconducting 123YBaCu-oxide produced at low temperatures |
August 23, 1994 |
| A method of preparing a superconductor. The method includes preparing a mixture of superconductor material constituents, disposing the constituents on a silver containing substrate, heating the mixture of constituents on a silver containing substrate, heating the mixture in a first a |
| 5114907 |
Cryogenic fluid level sensor |
May 19, 1992 |
| A cryogenic level sensor assembly. A sensor assembly includes a continuous length of high temperature ceramic superconductor material, an exterior housing for holding the length of ceramic superconductor material, a support material disposed between the ceramic superconductor material an |
