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:
Sep. 05, 1978
Filed:
Aug. 05, 1976
Gary L Burnett, Anaheim, CA (US);
George I Tsuda, Fullerton, CA (US);
Hughes Aircraft Company, Culver City, CA (US);
Abstract
A lightweight microwave filter device is disclosed which utilizes a housing made of a lightweight metal such as aluminum having a relatively large coefficient of thermal expansion. The microwave filter also utilizes resonator elements which are either interdigital or in a comb-line filter arrangement. The resonator rods are made in two segments -- a lightweight metal such as aluminum having a relatively large coefficient of thermal expansion and a metal having a very low coefficient of thermal expansion such as invar. As the temperature varies the length of the rod also varies. The tuning capacitance between the rods and the housing varies with temperature changes and compensates for the change in the rod length. Thus the resonant frequency of the microwave filter is maintained relatively constant over a predetermined temperature range.