Antenna device

Abstract

An antenna device includes an antenna part and a dielectric formed on the antenna part. The dielectric is formed to be thicker in a direction of directivity that the antenna part is to be made to have, than in another direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects, features and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of an antenna device according to a first embodiment of the present invention;

FIG. 2 is a cut-away side view of the antenna device according to the first embodiment of the present invention;

FIG. 3 is a simulation model of the antenna device;

FIG. 4 indicates the directivity of the simulation model;

FIG. 5 is a perspective view of an antenna device according to a second embodiment of the present invention;

FIG. 6 is a cut-away side view of the antenna device according to the second embodiment of the present invention;

FIGS. 7A through 7E are diagrams for describing a manufacturing method of the antenna device;

FIGS. 8A, 8B are diagrams for describing the manufacturing method of the antenna device; and

FIG. 9 is a cross-sectional view of a variation of a dielectric.

Claims

1. An antenna device comprising: an antenna part; anda dielectric formed on the antenna part; whereinthe dielectric is formed to be thicker in a direction of directivity that the antenna part is to be made to have, than in another direction.

2. The antenna device according to claim 1, wherein the antenna part includesa printed wiring board, anda conductive pattern formed on the printed wiring board.

3. The antenna device according to claim 1, wherein the antenna part is made of a metal plate.

4. The antenna device according to claim 1, wherein the dielectric is made from highly dielectric resin.

5. The antenna device according to claim 1, wherein the dielectric is formed by insert-molding the antenna part with a dielectric material.

6. The antenna device according to claim 1, wherein the dielectric is formed by laminating plural layers of dielectric material having different dielectric constants.

7. A method of manufacturing an antenna device including an antenna part on which a dielectric material is molded, the method comprising the step of: insert-molding the antenna part with the dielectric material, such that the dielectric material is thicker in a direction of directivity that the antenna part is to be made to have, than in another direction.

8. A method of manufacturing an antenna device including an antenna part and a dielectric formed on the antenna part, the dielectric being formed to be thicker in a direction of directivity that the antenna part is to be made to have, than in another direction, the method comprising the step of one of: attaching the dielectric to the antenna part; andinsert-molding the antenna part and the dielectric.