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:
Feb. 09, 2010
Filed:
Jul. 09, 2008
Mitsutaka Hikita, Hachioji, JP;
Nobuhiko Shibagaki, Kokubunji, JP;
Shigeki Matsuda, Nomi, JP;
Naoki Matsuura, Yokohama, JP;
Kazuyuki Yokoyama, Yokohama, JP;
Mitsutaka Hikita, Hachioji, JP;
Nobuhiko Shibagaki, Kokubunji, JP;
Shigeki Matsuda, Nomi, JP;
Naoki Matsuura, Yokohama, JP;
Kazuyuki Yokoyama, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Media Electronics Co., Ltd., Mizusawa, JP;
Abstract
A technology which can realize a high-performance multiband operation in a compact circuit configuration and is advantageous for a wireless terminal of GSM system for which the further increase of the demands is expected in the future is provided. Provided is a multiband switch type antenna duplexer adopted in a mobile phone used in TDMA system such as the GSM system, in which the signals of respectively different first to fourth frequency bands (GSM 850, EGSM, DCS, PCS) share a single antenna, wherein switching elements such as receive filters and diodes are combined in various ways to perform the high-performance band switch with the minimum number of switching elements. The circuit of this antenna duplexer can realize not only the size reduction of the multiband switch antenna duplexer but also the size reduction and performance improvement of the wireless terminal itself.