| 摘要 |
PROBLEM TO BE SOLVED: To provide a beam switching antenna with which an inertia moment is reduced by miniaturizing a rotary part itself, high-speed rotation sufficiently satisfying a scan speed is enabled and an insertion loss is reduced. SOLUTION: This antenna has a microstrip circuit board 1 circumferentially arranging plural patch antenna radiation elements 11 and a turnable microstrip power feeding line 21. Then, the power feeding line 21 is turned and successively overlapped with the patch antenna radiation elements 11, and the turnable microstrip power feeding line 21 to be slot-connected has a rotary shaft 5 at a position having a fixed gap from the patch antenna radiation element 11 and is slot-connected with a microstrip power feeding line 41 for input at the position of the rotary shaft 5.
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