| 摘要 |
PROBLEM TO BE SOLVED: To provide a helical antenna that enables transmission/reception with high accuracy by enhancing feeding phase difference accuracy with respect to each antenna element. SOLUTION: Signal input sections 105a-108a of antenna elements 105-108 are substantially held on the same circle. Signal output sections 113b, 113c, 114b, 114c of a feeding circuit 102 supplying feeding signals to the antenna elements 105-108 with a prescribed phase difference to each other are supported on a plane perpendicularly to a plane, where the circle is placed and on a line segment passing through a substantial center of the circle. Thus, the electrical length of feeders 119A-119D connecting the signal output sections 113b, 113c, 114b, 114c and the signal input sections 105a-108a is arranged.
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