Title:
BYPASS FILTER, MULTI−BAND ANTENNA SWITCH CIRCUIT, AND LAYERED MODULE COMPOSITE PART AND COMMUNICATION DEVICE USING THEM
Document Type and Number:
WIPO Patent Application WO/2003/015301
Kind Code:
A1
Abstract:
A multi−band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission&sol reception terminals, a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit. The multi−band antenna switch circuit includes a high pass filter having an input terminal and an output terminal and provided at least between the diplexer and the antenna terminal and including a first inductor connected between the input terminal and the ground, a first capacitor connected between the input terminal and the output terminal, a second inductor connected to the output terminal, and a second capacitor connected between the second inductor and the ground.
Inventors:
FUKAMACHI KEISUKE (JP)
KEMMOCHI SHIGERU (DE)
WATANABE MITSUHIRO (JP)
TAKETA TSUYOSHI (JP)
TAI HIROYUKI (JP)
YOKOUCHI SATORU (JP)
KEMMOCHI SHIGERU (DE)
WATANABE MITSUHIRO (JP)
TAKETA TSUYOSHI (JP)
TAI HIROYUKI (JP)
YOKOUCHI SATORU (JP)
Application Number:
PCT/JP2002/008215
Publication Date:
February 20, 2003
Filing Date:
August 12, 2002
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
FUKAMACHI KEISUKE (JP)
KEMMOCHI SHIGERU (DE)
WATANABE MITSUHIRO (JP)
TAKETA TSUYOSHI (JP)
TAI HIROYUKI (JP)
YOKOUCHI SATORU (JP)
FUKAMACHI KEISUKE (JP)
KEMMOCHI SHIGERU (DE)
WATANABE MITSUHIRO (JP)
TAKETA TSUYOSHI (JP)
TAI HIROYUKI (JP)
YOKOUCHI SATORU (JP)
International Classes:
H03H7/01; H03H7/075; H03H7/46; H04B1/40; H04B1/48; H04B1/52; H04B1/44; (IPC1-7): H04B1/50; H03H7/075
Foreign References:
| JPH118562A | 1999-01-12 | |||
| JP2000165274A | 2000-06-16 | |||
| JPH1093473A | 1998-04-10 | |||
| JPH04260221A | 1992-09-16 | |||
| JPH11168303A | 1999-06-22 | |||
| JP2000165273A | 2000-06-16 | |||
| JP2001044885A | 2001-02-16 | |||
| JP2001102957A | 2001-04-13 | |||
| JPH11112382A | 1999-04-23 |
Other References:
See also references of EP 1418680A4
Attorney, Agent or Firm:
Takaishi, Kitsuma (Tokyo, Tokyo, JP)
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