Patent ID: 8774743
Filing Date: 2014-07-08
Classification: H01Q,H03H

Abstract:
1. A wireless communications system, comprising: a tunable matching network having an input and an output, the output of the tunable matching network connected via a low noise amplifier to an input of a power detector, an output of the power detector connected to a radio frequency receiver in a receiver system; an antenna connected at the antenna feedpoint to the input of the tunable matching network to input electromagnetic signals from the antenna to the radio frequency receiver; a control system configured to use three different measurements of power levels detected at a single location by the power detector to calculate, in real-time, a complex value of an input impedance of the antenna at the antenna feedpoint, by using the three different power measurements simultaneously to solve two non-linear equations, and to tune the matching network to match its input impedance to the calculated value of the input impedance of the antenna.