Title:
ANTENNA SYSTEM, ANTENNA REFLECTOR, AND RADIO COMMUNICATION APPARATUS WITH BUILT-IN ANTENNA
Document Type and Number:
Japanese Patent JP2007194915
Kind Code:
A
Abstract:
To provide an antenna system which has a high front-to-back ratio and is made compact.
A helical dipole antenna is used as a radiator and a corner reflector formed obtained by folding a conductor plate at 90 degrees along a ridge is used as a reflector. Linear slit parts are formed in the corner reflector respectively at two sides parallel to a principal plane of polarization to obtain wavelength shortening effect that make the line length of the corner reflector equivalently long in an electric field direction, and a larger front-to-back ratio can be obtained when a corner reflector of the same size is used.
COPYRIGHT: (C)2007,JPO&INPIT
Inventors:
ASAKURA KENJI
YOKOKI KIYOTADA
YOKOKI KIYOTADA
Application Number:
JP2006011175A
Publication Date:
August 02, 2007
Filing Date:
January 19, 2006
Export Citation:
Assignee:
SONY CORP
International Classes:
H01Q15/14; H01Q9/26; H01Q11/04; H01Q19/10
Attorney, Agent or Firm:
Masaaki Miyata
Eiji Yamada
Toshio Sawada
Eiji Yamada
Toshio Sawada
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