Patent ID: 9287960
Filing Date: 2016-03-15
CPC Classification: G01S,H01Q,H04B

Claim Text:
1. A radio communication apparatus comprising: a plurality of antennas; local signal phase shifters each setting a phase of a local signal to a controlled value; baseband signal phase shifters each setting a phase of a baseband signal to a controlled value; quadrature modulators each up-converting the baseband signal output from a corresponding one of the baseband signal phase shifters by the local signal from a corresponding one of the local signal phase shifters and converting frequency of the baseband signal to generate a transmission signal; 180° distributors each distributing the local signal into two signals of 0° and 180°, in place of the local signal phase shifters each setting the phase of the local signal to a controlled value; and a mechanism for controlling a radiation direction of a radio signal to be sent from each of the antennas, wherein first radiation direction of the transmission signal to be sent from each of the antennas and second radiation direction of a local leak signal can be controlled independently from each other, the number of the baseband signal phase shifters, and the number of the quadrature modulators are all equal to each other and the number of plurality of antennas, and the number of the plurality of antennas is an odd number (2n+1) (n is an integer), and the radio communication apparatus comprises n pieces of the 180° distributors and one local signal phase shifter which sets the phase of the local signal to a controlled value.