| 摘要 |
PURPOSE:To receive four kinds of satellite signals by one primary radiator by extracting selectively a linearly polarized wave signal by the selection of a rotary angle of a post-stage selection extraction means and a circularly polarized wave signal through the selection of a rotary angle of a pre-stage 90 deg. phase difference plate and selection extraction means. CONSTITUTION:Four kinds of signals entering an inlet of a circularly waveguide 16 pass through the part of the pre-stage 90 deg. phase difference plate 21 with respect to each linearly polarized wave signal of vertical and horizontal polarized wave and they are extracted respectively through the selection of the rotary angle of post-stage selection extracting means 28, 31. On the other hand, with respect to the left and right rotatory polarized waves, they are linearly polarized wave signals of left or right rotatary (45 deg.) to the 90 deg. phase difference plate through the pre-stage 90 deg. phase difference plate and they are extracted selectively by the selection of the rotary angle of the selection extracting means 28, 31 similarly. Thus, four kinds of signals are selectively received. |
