| 摘要 |
PURPOSE:To obtain an antenna which handles both clockwise and counterclockwise polarized wave by adding plural variable capacity active elements to a microstrip antenna. CONSTITUTION:When the capacities of C14 and C15 of varactor diodes added to the antenna are, for example, 0.053 and 0.068 (pF) at some bias voltage respectively, the antenna operates as a counter-clockwise polarized wave antenna when a bias voltage V is 0V, or as a clockwise polarized wave antenna when V=V0(V). For this purpose, the bias voltage to be applied to the varactor diodes (variable capacity active elements) is switched between 0V and V0(V) to allow the antenna to operate as the counterclockwise and clockwise polarized wave antenna, so this is applicable to a diversity antenna for circularly polarized waves. |
