Wide band antenna for mobile communications
First Claim
1. An antenna device for vehicles, comprising a ground plate having a flat surface, and L-shaped radiator plate having one leg of the L shape arranged parallel to said ground plate with the other leg being positioned perpendicular to said ground plate, said radiator plate being disposed having a narrow gap between an end of said perpendicular leg and the upper surface of said ground plate, a feed coaxial cable for connecting said ground plate with an outer conductor and also for connecting an inner conductor with substantially the center of the end of said perpendicular leg of said radiator plate, and a sub-radiator element formed by an L-shaped plate rigidly mounted on said ground plate at a position in close proximity to said radiator plate, said sub-radiator element having one leg extending parallel to said ground plate with the end thereof being spaced away from the end of the parallel leg of said radiator plate by a given distance, and a perpendicular leg of said L-shaped plate of said sub-radiator element having the end thereof connected with said ground plate to provide an increased resonant band width.
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Accused Products
Abstract
An antenna to be mounted on a vehicle. The antenna includes a ground plate with an L-shaped radiator plate and an L-shaped sub-radiator plate. One leg of the radiator plate and sub-radiator plate are parallel to the ground plate. The parallel legs are spaced from the ground plate. The other leg is perpendicular to the ground plate. The perpendicular leg is separated from the ground plate by a small gap. The two legs are opposed to each other with a gap between the legs parallel to the ground plate. In some embodiments, filler is placed between the plates.
94 Citations
15 Claims
- 1. An antenna device for vehicles, comprising a ground plate having a flat surface, and L-shaped radiator plate having one leg of the L shape arranged parallel to said ground plate with the other leg being positioned perpendicular to said ground plate, said radiator plate being disposed having a narrow gap between an end of said perpendicular leg and the upper surface of said ground plate, a feed coaxial cable for connecting said ground plate with an outer conductor and also for connecting an inner conductor with substantially the center of the end of said perpendicular leg of said radiator plate, and a sub-radiator element formed by an L-shaped plate rigidly mounted on said ground plate at a position in close proximity to said radiator plate, said sub-radiator element having one leg extending parallel to said ground plate with the end thereof being spaced away from the end of the parallel leg of said radiator plate by a given distance, and a perpendicular leg of said L-shaped plate of said sub-radiator element having the end thereof connected with said ground plate to provide an increased resonant band width.
- 14. An antenna device for vehicles, comprising a ground plate having a flat surface, an L-shaped radiator plate having one leg of the L shape arranged parallel to said ground plate with the other leg being positioned perpendicular to said ground plate, said radiator plate being disposed having a narrow gap between an end of said perpendicular leg and the upper surface of said ground plate, a feed coaxial cable for connecting said ground plate with an outer conductor and also for connecting an inner conductor with substantially the center of the end of said perpendicular leg of said radiator plate, and a sub-radiator element formed by an L-shaped plate being disposed close to said ground plate at a position in opposite proximity to said radiator plate, said sub-radiator element having one leg extending parallel to said ground plate with the end thereof being spaced away from the end of the parallel leg of said radiator plate by a given distance, and a perpendicular leg of said L-shaped plate of said sub-radiator element having a connecting bridge portion thereof rigidly connected with said ground plate at one side of the perpendicular leg to widen a resonant band width.
Specification