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:
Nov. 20, 2001
Filed:
Jun. 11, 1999
Arvind K. Sharma, Torrance, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
The present invention provides a switched-line phase shifter (,) for creating a differential phase shift between switched transmission paths (,). A switched-line phase shifter (,) incorporates Schiffman sections (,) of lengths which are non-integer multiples of quarter-wavelength. The lengths of the Schiffman sections (,) are chosen such that no isolation points, which result from frequencies at which the effective electrical length of one of the transmission paths (,) is an integer multiple of &lgr;/2, occur over the operating frequency range of the phase shifter (,). The present invention also provides a space-efficient implementation of a switched-line phase shifter (,) which utilizes switches (,) between Schiffman subsections (,) to alternately combine and isolate the Schiffman subsections (,) thereby alternately creating effective Schiffman sections of greater and lesser length respectively.