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Title:
VARIABLE DIRECTIVITY ANTENNA AND VARIABLE DIRECTIVITY ANTENNA SYSTEM USING THE ANTENNA
Document Type and Number:
WIPO Patent Application WO/2004/091043
Kind Code:
A1
Abstract:
folded dipole antenna elements (2, 4) are generally parallel arranged at an interval shorter than 1/2 of the wavelength used. The antenna elements (2, 4) are connected to a combiner (16) through feeders (12, 14) having different lengths. The difference in length between the feeders (12, 14) is determined so that the received signals arriving from the front side at the antenna elements (2, 4) and received by the antenna elements (2, 4) are in phase at the inputs (16a, 16b) of the combiner (16) and the received signals arriving from the rear side at the antenna elements (2, 4) and received by the antenna elements (2, 4) are opposite at the inputs (16a, 16b).

Inventors:
SHIROSAKA TOSHIAKI (JP)
FUJISAWA SHINGO (JP)
FUJITA TOSHIO (JP)
TATEKAWA KIYOTAKA (JP)
SHIBUYA EIJI (JP)
Application Number:
PCT/JP2004/004793
Publication Date:
October 21, 2004
Filing Date:
April 01, 2004
Export Citation:
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Assignee:
DX ANTENNA (JP)
SHIROSAKA TOSHIAKI (JP)
FUJISAWA SHINGO (JP)
FUJITA TOSHIO (JP)
TATEKAWA KIYOTAKA (JP)
SHIBUYA EIJI (JP)
International Classes:
H01Q1/38; H01Q3/26; H01Q3/36; H01Q9/26; H01Q9/28; H01Q21/00; H01Q23/00; H01Q25/02; (IPC1-7): H01Q3/26
Foreign References:
JP2003008328A2003-01-10
JPS5866708U1983-05-06
JPS5613809A1981-02-10
JPS54140636U1979-09-29
JP2000236209A2000-08-29
JPS5680935A1981-07-02
JPS5782706U1982-05-21
JP2001217737A2001-08-10
JPH10191464A1998-07-21
JPH09181667A1997-07-11
JPH11231038A1999-08-27
Attorney, Agent or Firm:
Kimura, Masatoshi (7th Floor Shin-crescent Building, 72 Kyomachi, Chuo-k, Kobe-shi Hyogo, JP)
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