| 摘要 |
PURPOSE:To obtain antenna outputs with less number of antennas having same effect as the provision of a lot of antennas with different directivity, by connecting a plurality of phase shifters synthesizing outputs of a plurality of antennas each having a different phase between a plurality of antennas and antenna switching devices to make each phase difference different. CONSTITUTION:Phase shifters 3-5 are provided between antennas 1, 2 and an antenna switching device 6. The phase shifters 3-5 are constituted with cables of different length; l for terminals (b), (c) and (d) at the antenna 2, and l+lambda/2, l+lambda/4 at the antenna 1, respectively. A drive circuit 15 drives the antenna switching device 6 based on the output of an electric field level detector 11 and a multi-path distortion detector 12. |
