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:
Jan. 29, 2008
Filed:
Jun. 25, 2001
Toru Yamada, Katano, JP;
Tsutomu Matsumura, Yao, JP;
Toshio Ishizaki, Kobe, JP;
Hiroyuki Nakamura, Katano, JP;
Kazuhide Uriu, Katano, JP;
Toru Yamada, Katano, JP;
Tsutomu Matsumura, Yao, JP;
Toshio Ishizaki, Kobe, JP;
Hiroyuki Nakamura, Katano, JP;
Kazuhide Uriu, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A 3-frequency branching circuit in the past could not be used for a system wherein a TDMA method such as GSM and DCS and a W-CDMA method such as UMTS are mixed. The 3-frequency branching circuit equipped with branching means having first and second internal terminals, an antenna terminal of connecting to an antenna, a low-pass filter connected between the first internal terminal and the antenna terminal, and a high-pass filter connected between the second internal terminal and the antenna terminal, a switching circuit of switching between GSM TX and GSM RX, a switching circuit of switching between DCS TX, DCS RX and a third internal terminal, and a duplexer connected to the third internal terminal.