Patent ID: 8674782
Filing Date: 2014-03-18
Classification: H03H

Abstract:
1. An impedance matching module having a first port to be connected to an RF source and a second port to be connected to an antenna, said network comprising: an adjustable impedance matching network having an input coupled to the first port and a output coupled to the second port, said adjustable impedance matching network including at least two impedance components including at least one series component and at least one parallel component, with the adjustable impedance matching network having impedance matching characteristics which are adjustable in response to at least one control signal; a first voltage measurement device configured to sense a voltage on the impedance matching network at a first network node; a second voltage measurement device configured to sense a voltage on the impedance matching network at a second network node, with the first and second network nodes being located on opposite sides of the series component; a network adjuster circuit configured to switch the impedance matching network between at least first and second states, wherein in the first state, first and second voltages are sensed on the respective first and second nodes and wherein in the second state, different from the first state, third and fourth voltages are sensed on the respective first and second nodes; processing circuitry configured to detect a change in antenna impedance while an antenna is coupled to the second port, based upon the first, second, third and fourth sensed voltages; and matching adjustment circuitry configured to control the at least one control signal so as to adjust the impedance matching network so as to at least partially compensate for the change in antenna impedance.