Patent ID: 6992620
Filing Date: 2006-01-31
Classification: H01Q,H04B

Abstract:
1. A radio apparatus, comprising: a radio unit for reference which receives transmission signals from an antenna for measurement by an antenna for reference so as to derive a first weighting factor and which transmits, from the antenna for reference, signals weighted with the first weighting factor; a correcting radio unit which receives transmission signals from the antenna for measurement by an antenna for correction so as to derive a second weighting factor and which transmits, from the antenna for correction, signals weighted with the second weighting factor; a rotation unit which operates, at the time of transmitting signals, the second weighting factor while rotating, by a phase rotation amount of 0, a correction value against a π/2 phase shifter for transmission for performing quadrature modulation in said correcting radio unit, and which operates, at the time of transmitting signals, the second weighting factor while rotating, by a phase rotation amount of π, a correction value against a π/2 phase shifter for transmission for performing quadrature modulation in said correction radio unit; a measuring unit which receives signals transmitted from the antenna for reference and the antenna for correction by the antenna for measurement and which measures the strength of received signals as signals level an estimation unit which determines the phase rotation amount in the rotation unit to be 0 when the signal level wherein said rotation unit rotates the correction value by the phase rotation amount determined.