FILTER DEVICE - MATSUSHITA ELECTRIC IND CO LTD

Title:

FILTER DEVICE

Document Type and Number:

WIPO Patent Application WO/2008/062753

Kind Code:

A1

Abstract:

A high frequency filter includes an inductor (2); a serial resonance circuit (31) including an inductor (3a) and capacitors (4a, 5a); a serial resonance circuit (32) including an inductor (3b) and capacitors (4b, 5b), and a varactor diode (6) connected between a connecting point between the capacitor (4a) and the capacitor (5a) and a connecting point between the capacitor (4b) and the capacitor (5b). The controller (1) changes two attenuation pole frequencies of the filter device at the same time by changing the capacitance value of the varactor diode (6).

Inventors:

YAMAKAWA TAKEHIKO
OKAJIMA TOSHIYUKI
NAKATSUKA HIROSHI
ONISHI KEIJI

Application Number:

PCT/JP2007/072378

Publication Date:

May 29, 2008

Filing Date:

November 19, 2007

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)
YAMAKAWA TAKEHIKO
OKAJIMA TOSHIYUKI
NAKATSUKA HIROSHI
ONISHI KEIJI

International Classes:

H03H7/01; H04B1/18

Foreign References:

JP2004235898A	2004-08-19
JPH01238321A	1989-09-22
JPH0273821U	1990-06-06
JPH01238321A	1989-09-22
JP2003060408A	2003-02-28

Other References: