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:
Oct. 13, 1998
Filed:
May. 22, 1996
Kazuto Kitakubo, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An antenna switching circuit (55) is constructed by a circulator element (63) having three terminals, of which the first terminal (CTX) is connected to the transmitting circuit, the second terminal (CANT) is connected to a first antenna (4), and the third terminal (CRX) can be connected to the terminal resistance (64) through a first switch element (62); a second switch element (60) capable of connecting the third terminal of the circulator element to the receiving circuit; and a third switch element (61) capable of connecting a second antenna (22) to the receiving circuit, whereby, it is no longer necessary to use a duplexer circuit having large insertion loss, the whole construction can be miniaturized, and the insertion loss can be reduced.