| 摘要 |
PURPOSE:To form a multibeam of which performance deterioration is reduced in an existing range of the multibeam by forming the range like an ellipse. CONSTITUTION:An RLM forms the center sectional curves M0, S0 in a vertical surface (z, x surface) so as to obtain twin focuses F1, F2. The RLM also forms representative mirror surface curves SmSm'. SsSs' inersecting with the center sectional curves M0, S0 so as to obtain twin focuses F3, F4 to the beam deflection of a horizontal surface (y, z surface). If the phase center of a primary radiator is made coincide with the points F1, F2, the remaining aberration on the opening surface of a main reflector 6 which is obtained by subtracting an aberration from the beam deflection shows (a); although the abberation is zero in the vertical surface, the aberration is generated in other state. If the short and long diameter directions are made correspond to the vertical and horizontal surfaces respectively in the existing range of the elliptic multibeam, a multibeam antenna with small gain reduction can be obtained in said range. |
