| 摘要 |
PURPOSE:To execute an excitation of a circularly polarized wave with regard to a radiation element of an optional shape by determining a circularly polarized wave exciting frequency and a feeding point position of its frequency in accordance with a radiation element shape. CONSTITUTION:A relation of a frequency (f) by which a circularly polarized wave of a square type microstrip antenna can be excited, and an aspect ratio b/a becomes as shown in the figure, and when b/a is selected so as to be smaller than 0.99, the circularly polarized wave can be excited by two frequencies. Also, curves l1-l4 show a locus of a position of a feeding point in which the circular polarized wave can be driven, and l1 and l2, and l3 and l4 can excite the circular polarized waves of 953.47MHz (l1: right rotation, l2: left rotation), and 907.48MHz (l3: left rotation, l4: left rotation), respectively.
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