FLAT-TYPE WIDEBAND ANTENNA

PROBLEM TO BE SOLVED: To provide a flat-type wideband antenna which can be manufactured inexpensively, using a simple arrangement and is lightweight and withstands against wind velocity. SOLUTION: Dipole elements 11a and 11b are constituted of double-square conductors and a central element 12 is provided in the center of a square loop element. The dipole elements 11a and 11b are arranged on a plane, while keeping an interval d of about λ/50, and a half wavelength dipole antenna is constituted by setting the length (overall length) L in the electric field direction at about λ/2, where λ is the wavelength at the resonance frequency of the half-wavelength dipole antenna. The dipole element 11a, 11b has an overall width W of about λ/3.75 or larger, and the width a of a peripheral conductor element and the width b of the conductor element of a central element 12 are set at about λ/60. The dipole elements 11a and 11b are provided with feeding points 13a and 13b at substantially in the center portion on the facing sides. COPYRIGHT: (C)2007,JPO&INPIT