Hughes Aircraft Company

Itt Manufacturing Enterprises, Inc.

Hughes Aircraft Company, Hughes Electronics

Jerome I Glaser

Ronald I Wolfson

Juan F Lam

Joseph P Smalanskas

Raymond Eugene Hann

Makoto Andrew Igawa

Michael D Thomas

Allen M Tran

Shane H Hunter

A method and apparatus for use with a transistor array for enhancing the array's performance and/or reliability and/or longevity by sensing the temperature of each transistor in the array and initiating corrective action to maintain its temperature within a desired operating range. Each array transistor has a temperature sensor closely thermally coupled thereto preferably mounted within the transistor package, in close physical proximity to the transistor junction.

Power transistor array temperature control system

A broadband antenna system utilizes multiple photonic bandgap crystals to achieve nearly 100 percent power efficiency over a larger range of frequencies than prior antenna systems. Multiple custom tailored photonic bandgap crystals form a substrate for the antenna system. Each of the crystals is designed to cover a specific range of frequencies. The multiple crystals are attached together to form a photonic bandgap substrate whose bandwidth varies as a function of location on the substrate. A broadband antenna that can cover a wide frequency range, and whose active region shifts to different portions of the antenna as a function of frequency, is formed on the substrate such that the active region of the antenna is always on a crystal that has a corresponding operating bandwidth. The photonic bandgap crystals provide a nearly 100 percent efficient reflector for radiation emitted into the substrate that would otherwise be trapped or dissipated therein.

Efficient broadband antenna system using photonic bandgap crystals

A dielectric material having a dielectric constant which varies inversely with frequency, and preferably with the second power of frequency, fills the space between a radiator and a reflecting groundplane. The back-directed wave is reflected back to the radiator in phase with the directly radiated wave over a wide frequency band, increasing the radiator efficiency.

Radiator bandwidth enhancement using dielectrics with inverse frequency

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Los Angeles, CA, United States of America

Jerome I Glaser