The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2001
Filed:
Sep. 27, 1999
Peter R. Drake, Hudson, MA (US);
Keith R. Kessler, Andover, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A method for operating a microwave amplifier wherein a packaging arrangement is provided. The packaging arrangement includes: (i) a mounting thermally conducting mounting flange; (ii) an isomorphic, thermally conductive material disposed on the flange; (iii) a circuit comprising a semiconductor chip having a transistor arranged as the amplifier, such amplifier being adapted to operate at a nominal microwave frequency with a band of frequencies, disposed on a portion of a surface of the isomorphic, thermally conductive material, other surface portions of the thermally conductive material extending laterally beyond the portion of the material having the semiconductor chip disposed thereon; (iv) a corral having an aperture through an inner region thereof, the isothermal material being disposed within the aperture, such corral having an outer region thereon mounted to surface portions of the flange. The amplifier is biased for Class C operation. The method includes feeding pulsed microwave signals to the amplifier for amplification thereby. The pulses have pulse widths greater than 750 microseconds and have a duty cycle of about 25 percent or more. Thus, the amplifier is now able to operate with a substantially continuous wave input signal.