Antenna system having directivity for elongate service zone

H - Electricity – 01 – Q

Patent

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Details

H01Q 15/14 (2006.01) H01Q 1/12 (2006.01) H01Q 9/38 (2006.01) H01Q 19/10 (2006.01)

Patent

CA 2226437

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.

L'invention est une antenne adaptée pour être installée au plafond ou sur l'un des murs d'un espace délimité par les surfaces du plafond, des murs et du plancher. Cette antenne comprend un réflecteur et un élément rayonnant. Le réflecteur est doté d'une plaque mise à la terre, d'une couche diélectrique formée sur cette plaque et de bandes métalliques à configurations placées parallèlement à la direction longitudinale de l'espace en cause et formées sur cette couche diélectrique. L'élément rayonnant est placé perpendiculairement à la surface de réflexion du réflecteur. Il peut avoir la forme d'une barrette, d'un cylindre ou, au moins partiellement, d'une bobine. La distance entre le centre de l'axe de l'élément rayonnant et du réflecteur varie de 0,1 à 0,6 fois environ la longueur d'onde de travail. L'antenne de l'invention a une grande directivité dans les espaces en longueur tels que les tunnels, les couloirs ou les aires commerciales souterraines.

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