Robert C Hammond

US Patent:

6633208, Oct 14, 2003

Filed:

Jun 19, 2001

Appl. No.:

09/886768

Inventors:

Markku I. Salkola - Goleta CA
Robert B. Hammond - Santa Barbara CA
Neal Fenzi - Santa Barbara CA

Assignee:

Superconductor Technologies, Inc. - Santa Barbara CA

International Classification:

H01P 701

US Classification:

333167, 333 99005, 333185, 505700, 505866

Abstract:

Multi-stage electric filters with improved intermodulation-distortion characteristics and a method for designing such electric filters is provided. In general, the invention may include a multi-resonator electric filter in which one or more of the resonators have been intentionally designed to have a different IP and/or Q than the other resonators in the electric filter. In one case, the electric filters include a 4-resonator Chebyshev narrow pass-band filter with at least the first resonator having a Q and/or IP different from at least one other resonator in the filter. The filter thereby has improved IMD power over conventional designed filters while maintaining high Q. In a preferred embodiment the filter may include a superconducting material. The relative Q and IP of the respective resonators in the improved filter may depend on the relative strength of in-band and out-of-band signals. The performance and cost of the electric filter may be optimized by designing the filter to have a relative Q and IP required by the particular application.

US Patent:

6727702, Apr 27, 2004

Filed:

Mar 19, 2003

Appl. No.:

10/393089

Inventors:

Robert B Hammond - Santa Barbara CA
Jonathan Z. Sun - Shrub Oak NY
Douglas J. Scalapino - Santa Barbara CA
Timothy W. James - Goleta CA
Lincoln C. Bourne - Santa Barbara CA

Assignee:

Superconductor Technologies, Inc. - Santa Barbara CA

International Classification:

G01V 300

US Classification:

324318, 324322

Abstract:

A method of tuning a high temperature superconductor (HTS) resonator includes the steps of providing a HTS inductor and a HTS capacitor, the HTS capacitor being electrically connected to the HTS inductor. A tuning body is provided adjacent to the HTS inductor and the HTS capacitor. The relative position of the tuning body with respect to the HTS inductor and the HTS capacitor is altered so as to tune the resonator. A tunable resonant circuit is provided that includes a substrate having a planar surface. At least one resonator formed from HTS material is disposed on the substrate, the resonator having one or more turns that when combined, turn through greater than 360Â.

US Patent:

7190165, Mar 13, 2007

Filed:

Apr 12, 2004

Appl. No.:

10/823273

Inventors:

Robert B Hammond - Santa Barbara CA, US
Jonathan Z. Sun - Shrub Oak NY, US
Douglas J. Scalapino - Santa Barbara CA, US
Timothy W. James - Goleta CA, US
Lincoln C. Bourne - Santa Barbara CA, US

Assignee:

Superconductor Technologies, Inc. - Santa Barbara CA

International Classification:

G01V 3/00

US Classification:

324318, 324322

Abstract:

A method of tuning a high temperature superconductor (HTS) resonator includes the steps of providing a HTS inductor and a HTS capacitor, the HTS capacitor being electrically connected to the HTS inductor. A tuning body is provided adjacent to the HTS inductor and the HTS capacitor. The relative position of the tuning body with respect to the HTS inductor and the HTS capacitor is altered so as to tune the resonator. A tunable resonant circuit is provided that includes a substrate having a planar surface. At least one resonator formed from HTS material is disposed on the substrate, the resonator having one or more turns that when combined, turn through greater than 360.

US Patent:

8030925, Oct 4, 2011

Filed:

Mar 12, 2007

Appl. No.:

11/717596

Inventors:

Robert B. Hammond - Santa Barbara CA, US
Jonathan Z. Sun - Shrub Oak NY, US
Douglas J. Scalapino - Santa Babara CA, US
Timothy W. James - Llanmadog, GB
Lincoln C. Bourne - San Jose CA, US

Assignee:

Superconductor Technologies, Inc. - Santa Barbara CA

International Classification:

G01V 3/00

US Classification:

324318

Abstract:

A method of tuning a high temperature superconductor (HTS) resonator includes the steps of providing a HTS inductor and a HTS capacitor, the HTS capacitor being electrically connected to the HTS inductor. A tuning body is provided adjacent to the HTS inductor and the HTS capacitor. The relative position of the tuning body with respect to the HTS inductor and the HTS capacitor is altered so as to tune the resonator. A tunable resonant circuit is provided that includes a substrate having a planar surface. At least one resonator formed from HTS material is disposed on the substrate, the resonator having one or more turns that when combined, turn through greater than 360.

US Patent:

49010522, Feb 13, 1990

Filed:

Jul 8, 1988

Appl. No.:

7/217697

Inventors:

Roy W. Chapel - Edmonds WA
Robert W. Hammond - Edmonds WA

Assignee:

John Fluke Mfg. Co., Inc. - Everett WA

International Classification:

H01C 1012

US Classification:

338308

Abstract:

A resistive network formed on a substrate includes film resistors formed of resistive elements, each element having a plurality of portions symmetrically disposed relative to two axes of symmetry. The biaxially symmetric arrangement provides uniform resistance characteristics for the various film resistors, thus improving stability of resistance ratios among resistors of the network. TCR tracking for the film resistors, i. e. , the TCR of a ratio of the resistors, is similarly improved. Where the elements of different resistors of the network are interleaved, the temperature of the different resistors is also made more uniform.

US Patent:

47927828, Dec 20, 1988

Filed:

Mar 16, 1987

Appl. No.:

7/026156

Inventors:

Robert W. Hammond - Edmonds WA

International Classification:

H01C 706
H01C 310

US Classification:

338309

Abstract:

A resistor divider network is disclosed having two or more thin or thick film resistive elements deposited on a substrate. Each of the resistive elements is divided into a number of resistive subelements which are interleaved so as to improve the temperature coefficient of ratio (TCR tracking) and improve the thermal coupling which greatly improves the ratio constancy over a wide range of input voltage. There are an odd total number of resistive subelements, the subelements of each main element having equal resistances.

US Patent:

48599808, Aug 22, 1989

Filed:

Jun 13, 1988

Appl. No.:

7/205965

Inventors:

Robert W. Hammond - Edmonds WA

Assignee:

John Fluke Mfg. Co., Inc. - Everett WA

International Classification:

H01C 1012

US Classification:

338308

Abstract:

A resistor divider network is disclosed having two or more thin or thick film resistive elements deposited on a substrate. Each of the resistive elements is divided into a number of resistive subelements which are interleaved so as to improve the temperature coefficient of ratio (TCR tracking) and improve the thermal coupling which greatly improves the ratio constancy over a wide range of input voltage. There are an odd total number of resistive subelements, the subelements of each main element having equal resistances.

US Patent:

53589262, Oct 25, 1994

Filed:

Jul 29, 1993

Appl. No.:

8/098838

Inventors:

William L. Olson - Solvang CA
Michael M. Eddy - Goleta CA
Robert B. Hammond - Santa Barbara CA
Timothy W. James - Goleta CA
McDonald Robinson - Santa Barbara CA

Assignee:

Superconductor Technologies Inc. - Santa Barbara CA

International Classification:

H01L 3900

US Classification:

505210

Abstract:

Novel articles are provided of thin super-conductive thallium-based copper oxide layers on inorganic, usually crystalline substrates. Novel methods are provided for ease of producing such articles, particularly involving sol-gel techniques and laser ablation. The articles have a highly oriented superconductive thallium-based copper oxide film, particularly epitaxial, with high superconductive transition temperatures and desirable electrical properties. The subject articles find use in a wide variety of electronic applications, particularly in microwave and millimeter wave devices.