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. 28, 1999
Filed:
Sep. 19, 1997
Applicant:
Inventor:
James R Sherman, St. Petersburg, FL (US);
Assignee:
Raytheon Company, Lexington, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01P / ;
U.S. Cl.
CPC ...
333209 ; 333210 ;
Abstract
Tunable varactor diodes are utilized to adjust the filter frequency of a waveguide filter operating in evanescent mode. Because evanescent mode signals in a waveguide attenuate as they propagate, and because shunt capacitance between a waveguide and the surroundings can change the frequency at which the signals attenuate, controlling the shunt capacitance can filter the signals passing along the waveguide.