| 摘要 |
<p>An element (1) which acts as an antenna and circular-polarizer for the domestic reception of direct broadcast signals (DBS signals) has a front plate (2) of aluminium alloy, with two slots (3) and (4) of differing length and orthogonally crossing at their midpoints. The width and length of slots (3) and (4) are chosen in order to provide equal power flow through the slots and adequate bandwidth appropriate to the format of the DBS frequency band. Behind the plate (2), element (1) has a rectangular housing (5) to form a cavity contain a suspended strip line (7) with a support (8), whose free end is located below the point of crossing the two slots, and which extends outwardly therefrom in a straight line bisecting the angle formed by adjacent arms of slots (3) and (4) and being in a plane parallel to the plate (2).</p> |
