PLANAR ANTENNA

PROBLEM TO BE SOLVED: To provide a planar antenna capable of maintaining aesthetic appearance by securing transparency, and also, capable of realizing a wider bandwidth without using a matching unit or the like. SOLUTION: A film-like antenna substrate 11 is formed of a transparent synthetic resin or the like. An antenna element 12 composed of a conductive pattern is provided to the upper face of the antenna substrate 11. The antenna element 12 is composed, for example, by forming a metal wire into a lattice shape. Sufficient transparency can be secured by composing the line width of the metal wire, for example, by using a fine wire of ≤1 mm. The interval between the lattice-shaped metal wires is set, for example, to about 0.02 wavelength at a center frequency of a TV broadcast wave band of UHF. An elongated slit 13 is formed from the central part of one side to the other side in the antenna element 12. Feeding points 14a, 14b are respectively provided to both sides on the open end side of the slit 13 in the antenna element 12. COPYRIGHT: (C)2006,JPO&NCIPI