Title:
ANTENNA APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/016138
Kind Code:
A1
Abstract:
A very small loop antenna element of an antenna apparatus includes a plurality of
loop antenna parts that each have a predetermined loop plane and radiate a first polarization
component parallel to the loop plane; and at least one connecting conductor that
is oriented orthogonally to the loop plane, connects the plurality of loop antenna
parts and that radiates a second polarization component orthogonal to the first
polarization component. It is arranged that the maximum value of the antenna
gain of the first polarization component be substantially the same as the maximum
value of the antenna gain of the second polarization component when the distance
between the antenna apparatus and a conductive plate is changed in a case where
the antenna apparatus is disposed close to the conductive plate. Because of
this arrangement, the composition of the first and second polarization components
is substantially constant regardless of that distance.
Inventors:
MIYASHITA NORIHIRO
YOSHIKAWA YOSHISHIGE
YOSHIKAWA YOSHISHIGE
Application Number:
PCT/JP2007/065258
Publication Date:
February 07, 2008
Filing Date:
August 03, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
MIYASHITA NORIHIRO
YOSHIKAWA YOSHISHIGE
MIYASHITA NORIHIRO
YOSHIKAWA YOSHISHIGE
International Classes:
H01Q7/00; H01Q1/24; H01Q3/24; H01Q21/28
Domestic Patent References:
| WO2004070879A1 | 2004-08-19 | |||
| WO2004070879A1 | 2004-08-19 |
Foreign References:
| JPH1188246A | 1999-03-30 | |||
| US5850200A | 1998-12-15 | |||
| JP2004242179A | 2004-08-26 | |||
| JP2007051471A | 2007-03-01 | |||
| JP2002043826A | 2002-02-08 | |||
| JP2000244219A | 2000-09-08 | |||
| JP2005109609A | 2005-04-21 |
Other References:
"Antenna Engineering Handbook", 30 October 1980, OHMSHA, LTD., article "Information and Communication Engineers", pages: 59 - 63
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (IMP Building3-7, Shiromi 1-chome,Chuo-ku, Osaka-shi, Osaka, JP)
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