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Title:
MULTIFREQUENCY SHARED ANTENNA
Document Type and Number:
Japanese Patent JP2007060082
Kind Code:
A
Abstract:

To provide a technology of suppressing grating lobes in a vertical in-plane directivity characteristic of frequencies at a high frequency band in a multifrequency shared antenna.

The antenna includes: a reflection board; n (n≥2) sets of half wavelength dipole antenna elements arranged on a reflection face of the reflection board; n sets of parasitic elements located at a side of the the half wavelength dipole antenna elements reverse to the side at the reflection board; and (n+1) sets of conductive boards, each of the half wavelength dipole antenna elements is respectively arranged between (n+1) sets of the conductive boards, one end of each conductive board is opposite to a tip of each of the half wavelength dipole antenna elements, the other ends are connected to the reflection board, and an interval (d) of the half wavelength dipole antenna elements adjacent to each other satisfies formula of 0.25×λ1≤d<0.5×λ1, wherein λ1 is a free spatial wave whose operating center frequency resides in a lower frequency band in multi-frequencies.


Inventors:
KIMURA YASUKO
SO MASAKUNI
Application Number:
JP2005000240900
Publication Date:
March 08, 2007
Filing Date:
August 23, 2005
Export Citation:
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Assignee:
NIPPON DENGYO KOSAKU CO LTD
NTT DOCOMO INC
International Classes:
H01Q5/10; H01Q1/38; H01Q9/28; H01Q21/08; H01Q21/30
Attorney, Agent or Firm:
秋田 収喜
近野 恵一