Title:
チューナブルフィルタ
Document Type and Number:
Japanese Patent JP4053504
Kind Code:
B2
Abstract:
A tunable filter has a plurality of variable capacitors and a plurality of inductor elements, each being formed on a common substrate, a filter circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a monitor circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a detecting circuit which detects a prescribed circuit constant of the monitor circuit, a storage which stores information relating to a reference circuit constant of the monitor circuit, and a capacitance control circuit which controls capacitance of the variable capacitors in the monitor circuit and capacitance of the variable capacitors in the filter circuit, based on a result detected by the detecting circuit and information stored in the storage.
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Inventors:
Takashi Kawakubo
Ryoichi Ohara
Abe Kazuhide
Hiroshi Yoshida
Hiroshi Tsurumi
Ryoichi Ohara
Abe Kazuhide
Hiroshi Yoshida
Hiroshi Tsurumi
Application Number:
JP2004023012A
Publication Date:
February 27, 2008
Filing Date:
January 30, 2004
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H01G7/06; H03H9/58; H03B5/00; H03H7/075; H03H7/12; H03H9/00; H03H9/17; H03H9/46; H03H9/54; H03H9/60; H03H9/64; H03H11/04; H03J1/00; H03J3/08
Domestic Patent References:
| JP9098446A | ||||
| JP2003530705A | ||||
| JP2002532889A | ||||
| JP63187713A | ||||
| JP63501993A | ||||
| JP7335491A | ||||
| JP9064683A | ||||
| JP2003101375A | ||||
| JP10303699A | ||||
| JP2003124784A | ||||
| JP53118409U | ||||
| JP56093046U | ||||
| JP2003023363A |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki