ANTENNA DEVICE AND WIRELESS COMMUNICATION DEVICE

WIPO Patent Application WO/2010/140406

A1

Provided is a small antenna device which can continuously vary a plurality of resonant frequencies in a wide band with a low control voltage, and furthermore, is capable of performing matching between a power feed section and a radiation element corresponding to each resonant frequency. A wireless communication device is also provided. The antenna device (1) is provided with a first antenna section (2), a second antenna section (3), and a matching circuit section (4). The first antenna section (2) has a first radiation element (21), a capacitance power feed section (22), and a tuned circuit section (23), and the second antenna section (3) has a second radiation element (31). A second variable capacitance diode (41) in the matching circuit section (4) has the cathode side thereof connected to a power feeding line (111). A control voltage (Vc) is outputted to the power feed line (111) from a control voltage source (120) via a power feed section (110). As a result, the tuned circuit section (23) and the matching circuit section (4) change the reactance value, while being synchronized by means of the control voltage (Vc).

FUJIEDA SHIGEYUKI (JP)

PCT/JP2010/053755

December 09, 2010

March 08, 2010

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MURATA MANUFACTURING CO (JP)
FUJIEDA SHIGEYUKI (JP)

H01Q23/00; H01Q5/10; H01Q9/14

JP4238915B2	2009-03-18
JP2004320611A	2004-11-11
JP2005159813A	2005-06-16
JP2008005313A	2008-01-10
JP2006319477A	2006-11-24
JPH1079622A	1998-03-24

TSUKAHARA Takakazu (JP)
Takakazu Tsukahara (JP)

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