ANTENNA DEVICE AND RADIO COMMUNICATION DEVICE

Title:

ANTENNA DEVICE AND RADIO COMMUNICATION DEVICE

Document Type and Number:

WIPO Patent Application WO/2008/013021

Kind Code:

A1

Abstract:

It is possible to provide an antenna device and a radio communication device capable of increasing the number of resonances and the bandwidth, improving the antenna efficiency, and performing accurate matching in all the resonance frequencies. The antenna device (1) includes a radiation electrode (2) to which capacity is fed via a capacity unit (C1) and additional radiation electrodes (3-1 to 3-3). The radiation electrode (2) has a tip end (2a) which is grounded to a ground region (402) and becomes a minimum voltage portion during power supply. Moreover, a capacity unit (C2) which becomes a maximum voltage portion during power feed is formed at the base end (2b) of the radiation electrode (2). A grounded variable capacity element (4) is connected in series to the capacity unit (C2). Moreover, the additional radiation electrodes (3-1 to 3-3) are connected to the radiation electrode (2) via switch elements (31 to 33) and have reactance circuits (5-1 to 5-3) in the middle of the connections. The additional radiation electrodes (3-1 to 3-3) have tip ends grounded to the ground region (402).

Inventors:

ISHIZUKA KENICHI (JP)
KAWAHATA KAZUNARI (JP)
TSUBAKI NOBUHITO (JP)

Application Number:

PCT/JP2007/062891

Publication Date:

January 31, 2008

Filing Date:

June 27, 2007

Export Citation:

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Assignee:

MURATA MANUFACTURING CO (JP)
ISHIZUKA KENICHI (JP)
KAWAHATA KAZUNARI (JP)
TSUBAKI NOBUHITO (JP)

International Classes:

H01Q9/14; H01Q1/24; H01Q1/38; H01Q7/00; H01Q9/38; H01Q9/42

Foreign References:

JP2002261533A	2002-09-13
JP2003060417A	2003-02-28
JP2004253943A	2004-09-09
JP2005269608A	2005-09-29
JP2002261533A	2002-09-13
JP2005210568A	2005-08-04
JP2002335117A	2002-11-22
JP2004047223A	2004-02-12

Other References: