Title:
HIGH FREQUENCY SWITCH
Document Type and Number:
Japanese Patent JP3777209
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide the high frequency switch of low insertion loss and high isolation by forming this switch so that a parallel PIN diode may likely be released when the switch is turned on but it may likely be short-circuited when the switch is turned off.
SOLUTION: PIN diodes D1 and D2 are serially and parallelly arranged, and the parallel PIN diode D2 is connected by the line of λ/4 use frequency. Since when the switch is turned on, the respective PIN diodes D1 and D2 are turned on, a transmission line is turned into through state and the top end of the λ/4 line is short-circuited, the λ/4 line 4 on the side of the transmission line 1 is opened, and only the insertion loss of the serial PIN diode D1 is observed. When the switch is turned off, the respective PIN diodes D1 and D2 are turned off, the serial PIN diode D1 is turned into high resistance state, and the top end of the λ/4 line is opened at such a time. Therefore, the λ/4 line on the side of the transmission line 1 is short-circuited, and the high isolation state is provided by such an attenuation factor.
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Inventors:
Yoshinobu Haga
Hirokazu Ueda
Shinichi Kawai
Masaaki Saito
Hirokazu Ueda
Shinichi Kawai
Masaaki Saito
Application Number:
JP29585695A
Publication Date:
May 24, 2006
Filing Date:
November 14, 1995
Export Citation:
Assignee:
富士通株式会社
International Classes:
H01P1/15; H03K17/76; H04B1/44; (IPC1-7): H01P1/15; H03K17/76; H04B1/44
Domestic Patent References:
| JP5283901A | ||||
| JP3263928A | ||||
| JP7307604A | ||||
| JP3258126A | ||||
| JP7123077A | ||||
| JP6501833A | ||||
| JP7023450A | ||||
| JP4097602A | ||||
| JP7022802A | ||||
| JP6343002A |
Attorney, Agent or Firm:
Yu Sanada