| 摘要 |
PURPOSE:To attain antenna selection and synthesis and the rotation of antenna directivity, by controlling a directivity control pulse signal train, performing the selection and synthesis of antenna elements, and switching the antenna directivity sequentially. CONSTITUTION:A pulse train is inputted to a switch driving circuit 17 as a directivity control switch signal transmitted from a directivity controller. A pulse is outputted from a sequential switch driving circuit 17 to a switching circuit 16. The circuit 16 gives an output (OUT) and selects a corresponding antenna while switching the connection to antenna 1, 2, 3, 15 sequentially in response to the number of input pulses. When the number of antennas is N, the N-stage of shift registers constituting the switch driving circuit is provided, allowing to prevent the output corresponding to the antennas selected at the switching circuit from being zeroed. |
