DIRECTIVITY-VARIABLE ANTENNA

WIPO Patent Application WO/2007/072710

A1

A directivity-variable antenna includes three or more linear parasitic element bodies (21) parallel to Z-axis surrounding a feeding element (10). Each of the parasitic element bodies (21) is formed by two or more element pieces (211) parallel to the Z-axis and a first switch element (51). The parasitic element (2) further includes at least one second switch element (55) for electrically connects two adjacent parasitic element bodies (21) when ON and electrically insulating the adjacent parasitic element bodies (21) when OFF. The directivity is changed by switching ON and OFF state of the at least one first switch element (51) and the at least one second switch element (55). This realizes a directivity-variable antenna having a linear antenna whose radiation directivity is changed in a vertical plane and length in the longitudinal direction of the entire antenna is not increased by the parasitic element.

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FUJISHIMA TOMOYASU
SAKIYAMA KAZUYUKI
SANGAWA USHIO
KANNO HIROSHI

PCT/JP2006/324760

June 28, 2007

December 12, 2006

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MATSUSHITA ELECTRIC IND CO LTD (JP)
FUJISHIMA TOMOYASU
SAKIYAMA KAZUYUKI
SANGAWA USHIO
KANNO HIROSHI

H01Q3/44; H01P1/10; H01Q9/16

WO2005112194A1

2005-11-24

JP2005012779A	2005-01-13
JP2001185947A	2001-07-06
JP2005340910A	2005-12-08
JPS4932239B1	1974-08-28

OKUDA, Seiji (10th Floor Osaka Securities Exchange Bldg., 8-16, Kitahama 1-chome, Chuo-ku, Osaka-sh, Osaka 41, JP)

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