Patent ID: 6326929
Filing Date: 2001-12-04
Classification: G01R

Abstract:
A method to measure the impedance of an antenna supplied by an amplifier, wherein the method consists of:the conversion, into voltage, of the value of the antenna supply current by means of a transformer whose primary winding is crossed by the supply current,the uncoupling, in a first step, of the antenna from the amplifier to charge the amplifier on a calibrating resistor Re through the primary winding of the transformer in making the voltage given by the secondary winding equal to the voltage given by the output of the amplifier,then the uncoupling, in a second step, of the calibrating resistor Re from the output of the amplifier by reconnecting the antenna to the output of the amplifier through the primary winding of the transformer to compute the modulus and the argument of impedance Z of the antenna through the multiplication, by the value of the calibrating resistor Re, of the ratio of the voltages given respectively during this second step by the output of the amplifier and the secondary winding of the transformer.