Antenna system having directivity for elongate service zone

Details Antenna system having directivity for elongate service zone Antenna system having directivity for elongate service zone

1998-01-08

1999-07-13

Le, Hoanganh

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343818, 343846, H01Q 916, H01Q 1910

Patent

active

059233010

ABSTRACT:
An antenna system is adapted to be installed on a ceiling surface or on one of side wall surfaces of a space defined by the ceiling surface, the side wall surfaces and a floor surface. The antenna includes a reflector and a radiator element. The reflector has a grounded plate, a dielectric layer formed on the grounded plate, and metal strips having patterns parallel to the longitudinal direction of the space and formed on the dielectric layer. The radiator element is disposed to be perpendicular to a reflecting surface of the reflector. The radiator element may be in a bar form, a cylindrical form or at least partly a coil form. The distance between the center of the longitudinal direction of the radiator element and the reflector is set to be about 0.1 to 0.6 times the wavelength of the working frequency. The antenna system has high directivity along an elongate space such as a tunnel, a corridor or an underground shopping area.

REFERENCES:
patent: 4114163 (1978-09-01), Borowick
patent: 5220334 (1993-06-01), Raguenet et al.
patent: 5434580 (1995-07-01), Raguenet et al.

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