Title:
SMALL ANTENNA UNIT
Document Type and Number:
WIPO Patent Application WO/2008/038354
Kind Code:
A1
Abstract:
A small antenna unit in which directivity gain does not deteriorate even if an
antenna element and a mounting component are arranged in close proximity to a
metal surface. When an antenna element (101) is arranged in close proximity
to a metal housing (102) substantially in parallel therewith, a high resistance
film (104) is formed, by vapor deposition, on the surface of the metal housing
(102) opposing the antenna element (101) in order to increase the surface resistance
of the metal housing (102). When an antenna current i101 flows through
the antenna element (101), a negative-phase current i102 flows through
the high resistance film (104) on the surface of the opposing metal housing (102),
but the negative-phase current i102 is dependent on the resistance
of the high resistance film (104) and thereby the current component is suppressed
to have a relatively small value. Since the apparent antenna current i101
has a large value, directivity gain G101 of the antenna element (101)
is increased, thereby enhancing antenna performance.
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Inventors:
HAYASHI TOSHITERU
KOYANAGI YOSHIO
TANAKA NOBUAKI
SAITO YUTAKA
KOYANAGI YOSHIO
TANAKA NOBUAKI
SAITO YUTAKA
Application Number:
PCT/JP2006/319197
Publication Date:
April 03, 2008
Filing Date:
September 27, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
HAYASHI TOSHITERU
KOYANAGI YOSHIO
TANAKA NOBUAKI
SAITO YUTAKA
HAYASHI TOSHITERU
KOYANAGI YOSHIO
TANAKA NOBUAKI
SAITO YUTAKA
International Classes:
H01Q9/38; H01Q1/46; H01Q1/52; H01Q17/00
Foreign References:
| JP2004104502A | 2004-04-02 | |||
| JPS54103732U | 1979-07-21 | |||
| JP2005309811A | 2005-11-04 | |||
| JP2005005883A | 2005-01-06 | |||
| JP2000188510A | 2000-07-04 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (Shintoshicenter Bldg. 24-1, Tsurumaki1-chome, Tama-sh, Tokyo 34, JP)
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