Patent ID: 6870878

Claim:
A radio apparatus capable of calibrating transmission characteristics, comprising: n (n: integer greater than or equal to 3) signal transmission systems each including an antenna (ANT) as well as a transmission circuit (TX) and a receiving circuit (RX) sharing said antenna; control means ( 22 ) performing control for transmitting a known signal from said transmission circuit of each of said n signal transmission systems and receiving said transmitted signal in said receiving circuits of a plurality of signal transmission systems included in said n signal transmission systems in calibration; signal processing means (PE, AE) provided for each said signal transmission system for performing prescribed signal processing on a signal received in said receiving circuit of said signal transmission system with said known signal; storage means ( 21 ) storing signals obtained by said signal processing means in said plurality of signal transmission systems; and arithmetic means ( 22 ) calculating information related to at least either a phase rotation quantity or an amplitude fluctuation quantity resulting in a signal from passage of said signal through each of said transmission circuit and said receiving circuit of each of said n signal transmission systems on the basis of said signals stored in said storage means.