FILTER CIRCUIT APPARATUS AND MANUFACTURING METHOD THEREOF

Title:

FILTER CIRCUIT APPARATUS AND MANUFACTURING METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2003/056654

Kind Code:

A1

Abstract:

A filter circuit includes a filter element (4) which is a parallel resonance circuit having a pair of first resonance lines (19a, 19b) formed by the thick film formation technique and a pair of second resonance lines (20a, 20b) formed by the thin film formation technique. By significantly reducing the thickness of the pair of second resonance lines (20a, 20b), it is possible to increase the impedance ratio of the pair of second resonance lines (20a, 20b) and the pair of first resonance lines (19a, 19b), thereby reducing the length of the resonance lines (19a, 19b, 20a, 20b) and reducing the filter element size.

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Inventors:

Hirabayashi, Takayuki c/o SONY CORPORATION 7-35 (Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)

Application Number:

PCT/JP2002/013031

Publication Date:

July 10, 2003

Filing Date:

December 12, 2002

Export Citation:

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Assignee:

SONY CORPORATION (7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Hirabayashi, Takayuki c/o SONY CORPORATION 7-35 (Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)

International Classes:

H05K3/46; H01P1/203; H01P3/08; H01P7/08; H05K1/16; H05K3/02; (IPC1-7): H01P1/203; H01P3/08

Attorney, Agent or Firm:

Koike, Akira (11th Floor, Yamato Seimei Bldg. 1-, Uchisaiwai-c Chiyoda-ku Tokyo, 100-0011, JP)

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