Patent ID: 6433738
Filing Date: 2002-08-13
Classification: H01Q,H04B

Abstract:
A transmission antenna directivity control apparatus for controlling directivity formed by a plurality of transmission array antenna elements for a radio wave signal arrival direction to a plurality of reception array antenna elements, comprising:reception multi-beam generation means for weighting and combining reception signals from the reception array antenna elements using a preset weight coefficient to generate reception multi-beams; transmission weight coefficient generation means for generating, in accordance with detection powers of the reception multi-beams from said reception multi-beam generation means, a transmission weight coefficient for transmission data in correspondence with each of transmission multi-beams corresponding to the transmission array antenna elements; and transmission multi-beam generation means for multiplying the transmission data by the transmission weight coefficient from said transmission weight coefficient generation means to generate the transmission multi-beams and supplying the transmission multi-beams to the corresponding transmission array antenna elements, said transmission weight coefficient generation means comprisingpower ratio calculation means for calculating a power ratio of a maximum power of the detection powers of the reception multi-beams to an adjacent power of the maximum power beam, which exhibits a larger power beam, and transmission weight coefficient calculation means for calculating the transmission weight coefficient on the basis of the power ratio from said power ratio calculation means.