Title:
VARIABLE CAPACITANCE MODULE AND MATCHING CIRCUIT MODULE
Document Type and Number:
WIPO Patent Application WO/2010/113746
Kind Code:
A1
Abstract:
An inexpensive and compact variable capacitance module which can reliably and inexpensively achieve a variety of necessary variable capacitance ranges. The variable capacitance circuit (11) is provided with a variable capacitance element (Cv3) and fixed capacitance elements (Ce1, Ce2). The variable capacitance element (Cv3) and one fixed capacitance element (Ce1) are connected in series, and this series circuit and the other fixed capacitance element (Ce2) are connected in parallel. Due to this, the range of the combined capacitance of the variable capacitance circuit, with the capacitance of the other fixed capacitance element (Ce2) as a reference, is given by a step size ΔC of capacitance based on the combined capacitance of the variable capacitance element (Cv3) and the one fixed capacitance element (Ce1). Here, the fixed capacitance elements (Ce1, Ce2) are achieved by inner layer flat electrodes of a multilayer board, and the variable capacitance element (Cv3) is achieved by an MEMS element mounted on the top surface of the multilayer board.
Inventors:
NAGAI Tomohiro (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
永井智浩 (〒55 京都府長岡京市東神足１丁目１０番１号 株式会社 村田製作所内 Kyoto, 〒6178555, JP)
TONEGAWA Ken (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
永井智浩 (〒55 京都府長岡京市東神足１丁目１０番１号 株式会社 村田製作所内 Kyoto, 〒6178555, JP)
TONEGAWA Ken (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
Application Number:
JP2010/055181
Publication Date:
October 07, 2010
Filing Date:
March 25, 2010
Export Citation:
Assignee:
Murata Manufacturing Co., Ltd. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
株式会社村田製作所 (〒55 京都府長岡京市東神足１丁目１０番１号 Kyoto, 〒6178555, JP)
NAGAI Tomohiro (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
永井智浩 (〒55 京都府長岡京市東神足１丁目１０番１号 株式会社 村田製作所内 Kyoto, 〒6178555, JP)
株式会社村田製作所 (〒55 京都府長岡京市東神足１丁目１０番１号 Kyoto, 〒6178555, JP)
NAGAI Tomohiro (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
永井智浩 (〒55 京都府長岡京市東神足１丁目１０番１号 株式会社 村田製作所内 Kyoto, 〒6178555, JP)
International Classes:
H01G5/40; H01G5/16; H01P1/00; H03H7/38
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (1-4-34, Noninbashi Chuo-ku, Osaka-sh, Osaka 11, 〒5400011, JP)
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