PLANAR ANTENNA

Japanese Patent JP3783226

B2

PROBLEM TO BE SOLVED: To accurately hold and fix the intervals among an upper case, a planar antenna element, and a ground plate at regular intervals in a planar antenna. SOLUTION: A plurality of small protrusions 21 having stepped parts for fixing a planar antenna element 12 with regular intervals are arranged at the central site of the backside of an upper case 16 of a planar antenna 11, and the planar antenna 12 in which small holes are opened at parts corresponding to the small protrusions 21 is fixed so that the small holes can be fit into the small protrusions 21. A plurality of large protrusions 22 having stepped parts are arranged near the peripheral part of the backside of the upper case 16 for arranging a ground plane 13 at regular intervals from the planar antenna 12, and the ground plane 13 in which holes are opened at parts corresponding to the large protrusions 22 is fixed so that the holes can be fit into the large protrusions 22. Thus, it is possible to assembly the planar antenna by maintaining the regular intervals among the upper case 16 and the planar antennal element 12 and the ground plane 13.