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1. (WO2010113746) VARIABLE CAPACITANCE MODULE AND MATCHING CIRCUIT MODULE

Pub. No.:    WO/2010/113746    International Application No.:    PCT/JP2010/055181
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Fri Mar 26 00:59:59 CET 2010
IPC: H01G 5/40
H01G 5/16
H01P 1/00
H03H 7/38
Applicants: Murata Manufacturing Co., Ltd.
株式会社村田製作所
NAGAI Tomohiro
永井智浩
TONEGAWA Ken
利根川謙
HARADA Tetsuro
原田哲郎
Inventors: NAGAI Tomohiro
永井智浩
TONEGAWA Ken
利根川謙
HARADA Tetsuro
原田哲郎
Title: VARIABLE CAPACITANCE MODULE AND MATCHING CIRCUIT MODULE
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.