ANTENNA STRUCTURE AND RADIO COMMUNICATION DEVICE EMPLOYING IT

WIPO Patent Application WO/2007/094111

A1

In an antenna structure (1), a substrate (2) on which a feeding radiation electrode (6) and a parasitic radiation electrode (7) creating a double resonance state at least in the higher order resonance frequency band of the feeding radiation electrode (6) are formed is mounted in the ground region (Zg) of a circuit board (3). The antenna structure is provided with a capacitor loading means (12) for loading a capacitor to the higher order mode zero voltage region (P) of the feeding radiation electrode (6). The capacitor loading means (12) is connected electrically with a ground electrode (4) in the ground region of the circuit board (3) through a grounding conduction passage (15) and a switching means (16). On/off switching of capacitor loading to the higher order mode zero voltage region (P) of the feeding radiation electrode (6) by the capacitor loading means (12) is controlled through on/off switching of the switching means (16) thus switching the basic resonance frequency in the basic resonance frequency band of the feeding radiation electrode (6).

NAGUMO SHOJI (JP)
FURUYA KAZUYUKI (JP)
SHIMIZU MIE (JP)
FUJII HIROTAKA (JP)

PCT/JP2006/323818

August 23, 2007

November 29, 2006

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MURATA MANUFACTURING CO (JP)
NAGUMO SHOJI (JP)
FURUYA KAZUYUKI (JP)
SHIMIZU MIE (JP)
FUJII HIROTAKA (JP)

H01Q1/24; H01Q13/08; H01Q5/10; H01Q9/14; H01Q9/36

JP3658639B2	2005-06-08
JP3528737B2	2004-05-24
JP3503556B2	2004-03-08
JP2004312364A	2004-11-04
JPH11136025A	1999-05-21
JP2004274223A	2004-09-30
JPH10224142A	1998-08-21

IGARASHI, Kiyoshi (Yokohamahigashiguchi Bldg. 10-13, Takashima 2-chome, Nishi-ku, Yokohama-sh, Kanagawa 11, JP)

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