CIRCULARLY POLARIZED WAVE ANTENNA

摘要

PROBLEM TO BE SOLVED: To provide a circularly polarized wave antenna capable of obtaining an excellent axial ratio cover a very wide range and high in gain in a zenith direction. SOLUTION: The circularly polarized wave antenna 10 includes a planar loop antenna element 122, and a feeding means for applying four ways of feedings with a phase shift by 90-degrees each to the planar loop antenna element 122. The feeding means comprises four feeding probes 131 to 134. The circularly polarized wave antenna 10 includes a circuit board 25 arranged in parallel with the planar loop antenna element 122. The area of the circuit board 25 is greater than the area of the planar loop antenna element 122. A primary side 25U of the circuit board 25 entirely acts like a ground plane. A rear side 25L of the circuit board 25 is formed with a 90-degree phase shifter. COPYRIGHT: (C)2007,JPO&INPIT