Patent ID: 9300271
Filing Date: 2016-03-29
CPC Classification: H01J,H03H

Claim Text:
1. An impedance matching device configured to be disposed between a high-frequency power supply and a load, the matching device comprising: an input port connected to the high-frequency power supply; an output port connected to the load; an impedance variable circuit having a plurality of impedance values to be selected; a T-parameter memory that stores sets of T-parameters relating to the impedance matching device in a manner such that each of the sets of T-parameters is related to a corresponding one of the plurality of impedance values; an input voltage detector that detects a forward wave voltage and a reflected wave voltage at the input port; and a p-p value calculator for computation of a p-p value of a high-frequency voltage at the output port; wherein the computation of the p-p value of the high-frequency voltage is performed by using the forward wave voltage and the reflected wave voltage detected at the input port and also using one set of T-parameters stored in the T-parameter memory, wherein the computation of the p-p value of the high-frequency voltage is performed by a following formula: where V