| 摘要 |
PURPOSE: To receive both circularly and linearly polarized radio waves through a BS-CS antenna that uses a single radiator. CONSTITUTION: A probe 3 is attached to a probe shaft 5 which revolves in a circular waveguide 1, and a short plate 4 is interlocked to a short plate shaft 6 and revolves in the direction rectangular to the shaft 6. The distance is set atλ/4 between the probe 3 and an edge part 4a of the plate 4 together with a distanceλ/8 set between the part 4a and the end face of a square waveguide 2 respectively. The protrusions 5b and 6b are provided on a transmission part 5a of the shaft 5 and on a stopper 6a of the shaft 6 respectively. A motor, etc., is attached at the back 5c of the part 5a to revolve the shaft 5 toward an arrow 7. The directions of both probe 3 and plate 4 are defined within a vertically polarized wave surface. Under such conditions, the part 4a of the plate 4 functions as the short surface of a conventional primary radiator and can receive the vertically polarized waves. In the same way, the circularly polarized waves can be received when the probe 3 and the plate 4 are set vertically and at 45 deg. respectively.
|
