Title:
高周波スイッチ回路
Document Type and Number:
Japanese Patent JP4324814
Kind Code:
B2
Abstract:
A high-frequency switch circuit common to a plurality of frequency bands comprises a first high-frequency switch (SW2) connected to a high-frequency signal input (10) and output terminals and adapted to pass transmission signals of a first or a second frequency band and block received signals of the first and second frequency band; and a demultiplexer has a first high-frequency circuit which consists of a first phaseshifter (3) connected to a first terminal and a first bandpass filter (5) succeeding to the first phaseshifter (3), and a second high- frequency circuit which consists of a second phaseshifter (4) connected to the first terminal and a second bandpass filter (6) succeeding to the second phaseshifter (4). The transmission line in the first phaseshifter (3) has a line length such that the input impedance of the first high-frequency circuit is substantially open in the pass band of the second bandpass filter (6), whereas the transmission line in the second phaseshifter (4) has a line length such that the input impedance of the second high-frequency circuit is substantially open in the pass band of the first bandpass filter (5). Thus, the high-frequency switch circuit passes one of the received signals of the first and second frequency bands and blocks the other.
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Inventors:
Shigeru Kamochi
Mitsuhiro Watanabe
Takeda Takeshi
Hiroyuki Tadai
Mitsuhiro Watanabe
Takeda Takeshi
Hiroyuki Tadai
Application Number:
JP2008291424A
Publication Date:
September 02, 2009
Filing Date:
November 13, 2008
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
H04B1/44; H01P1/15; H01P1/213; H03K17/76; H04B1/40; H04B1/48; H04B1/50
Domestic Patent References:
| JP9307399A | ||||
| JP1227530A | ||||
| JP11112382A | ||||
| JP11168303A | ||||
| JP11313003A | ||||
| JP11154804A | ||||
| JP3010643U |
Attorney, Agent or Firm:
Takaishi Tachibana