| 摘要 |
<p>PURPOSE:To suppress the change of a coupling state with the rotation of a rotary part and to stably perform signal transmission of wide area, by forming microstrip lines over almost entire circumference by dividing the microstrip line at least on one side of the rotary part side or the fixed part side of a rotary coupler which performs the transfer of a high frequency signal into plural pieces. CONSTITUTION:Micro strips 5A, 5B, 6A, and 6B are provided oppositely to each other on each circumferential plane where the rotary part 1 and the fixed part 2 are confronted with each other, and the microstrip lines are formed with those strips and conductor layers 3 and 4. The microstrips 5A and 5B on the rotary part 1 side are provided only on the half of the outer circumference of the rotary part 1. The microstrips 6A and 6B on the fixed part 2 side are arranged at the rotational symmetric position for the rotational center of the rotary part 1. Each sum of the confronting areas of the microstrips 6A and 6B on the fixed part 2 side and the microstrips 5A and 5B on the rotary part 1 side is always set almost at a constant coupling length without being changed by the rotation of the rotary part 1, and also, an impedance characteristic is stabled. In such a way, it is possible to obtain a stable transmission characteristic.</p> |
