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. 12, 2013
Filed:
Dec. 18, 2007
Shigeru Kemmochi, Saitama, JP;
Keisuke Fukamachi, Saitama, JP;
Kazuhiro Hagiwara, Saitama, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
An inventive high frequency circuit includes a switch circuit (SPDT), connected to an antenna terminal (Ant), using a field-effect transistor for switching between a connection with first to third transmitting terminals (Tx-, Tx-, Tx-) and a connection with first to third receiving terminals (Rx-, Rx-, Rx-); a transmitting-side triplexer (Trip) for branching a transmitting path connected to the switch circuit into transmitting paths of first to third frequency bands; and a receiving-side triplexer (Trip) for branching a receiving path connected to the switch circuit into receiving paths of the first to third frequency bands. The switch circuit can be formed as an IC to downsize the circuit. For example, in constructing the high frequency circuit with a laminated module using a ceramic laminated substrate or the like, particularly when the number of triplexers occupying a large space is large, the switch circuit is formed as an IC and mounted on the laminated body, whereby the whole structure can be downsized.