| 摘要 |
PROBLEM TO BE SOLVED: To provide an indoor diversity receiving device capable of simplifying a circuit configuration and the control to improve reception performance in the case that an antenna is installed in a room to receive a broadcast wave.SOLUTION: Each branch 20a-20n weights a reception signal of a non-directivity antenna 21 arranged in a room by means of a weight circuit 22. The weight circuit 22 weights an amplitude by only on/off for a signal amplitude, weights a phase by only a positive/reverse phase for a signal phase, and has three combinations of discrete weight amounts. In the room, an electric field environment is a multipath, and an arrival angle of a path to a reception point is omnidirectionally uniform. In the case that an antenna is arranged in this electric field environment to receive a broadcast wave, the combined directivity of the antenna can be set to many kinds of properties depending on the conditions of simple weight to be applied to an individual branch. In the case of 8-branch, a horizontal surface combined directivity can be set in 6,000 or more ways, and thereby, a very high synthesis efficiency can be obtained. |
