Patent ID: 7035592
Filing Date: 2006-04-25
Classification: H01Q,H04B,H04W

Abstract:
1. A radio apparatus capable of calibration of antenna directivity, comprising: an antenna ( a transmission circuit ( a reference signal generator ( switching means ( control means ( arithmetic means ( said arithmetic means includes: means controlling said switching means to connect the output of said transmission circuit to the input of said receiving circuit in calibration for calculating first information related to the quantity of phase rotation and/or the quantity of amplitude fluctuation caused in a signal passing through said transmission circuit and said receiving circuit, means controlling said switching means to connect said reference signal to the input of said receiving circuit in calibration for calculating second information related to the quantity of phase rotation and/or the quantity of amplitude fluctuation caused in a signal passing through said receiving circuit, means subtracting said second information from said first information thereby calculating third information related to the quantity of phase rotation and/or the quantity of amplitude fluctuation caused in a signal passing through said transmission circuit, and means calculating said correction value on the basis of said second information and said third information.