FREQUENCY COMMON USE NON-DIRECTIONAL ANTENNA, AND ARRAY ANTENNA

Title:

FREQUENCY COMMON USE NON-DIRECTIONAL ANTENNA, AND ARRAY ANTENNA

Document Type and Number:

Japanese Patent JP2002198731

Kind Code:

A

Abstract:

To provide a frequency common use non-directional antenna that is used for frequency bands apart from each other.

The frequency common use non-directional antenna is provided with a cylindrical reflector made of a conductor, a couple of 1st half wavelength dipole antenna elements placed with the reflector in between, and couple of 2nd half wavelength dipole antenna elements that are placed with the reflector in between in a way of not being overlapped with a couple of the 1st half wavelength dipole antenna elements. The operating center frequency of a radiation wave from a couple of the 1st half wavelength dipole antenna elements differs from that of a couple of the 2nd half wavelength dipole antenna elements, and the interval of a couple of the 1st half wavelength dipole antenna elements and the interval of a couple of the 2nd half wavelength dipole antenna elements are selected shorter than half the wavelength of the operating center frequency of the radiation wave emitted from the respective half wavelength dipole antenna elements.

Inventors:

KARIKOMI MASATAKA
SHIMURA TAKESHI
EBINE YOSHIO

Application Number:

JP2000394584A

Publication Date:

July 12, 2002

Filing Date:

December 26, 2000

Export Citation:

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Assignee:

NIPPON DENGYO KOSAKU CO LTD
NTT DOCOMO INC

International Classes:

H01Q19/30; H01Q9/16; H01Q21/06; H01Q21/20; H01Q21/30; (IPC1-7): H01Q21/30; H01Q9/16; H01Q19/30; H01Q21/06; H01Q21/20

Attorney, Agent or Firm:

Satoru Akita (1 person outside)

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