Patent ID: 9059680
Filing Date: 2015-06-16
Classification: H03H

Abstract:
1. An impedance adjustment apparatus that is provided between a high frequency power source and a load, and adjusts a target impedance seen from the high frequency power source to the load, the apparatus comprising: an input end for connecting to the high frequency power source; an output end for connecting to the load; a variable electrical characteristic element; a characteristic parameter storage unit for storing a plurality of characteristic parameters indicating transmission characteristics of the impedance adjustment apparatus, the plurality of characteristic parameters being parameters that are respectively acquired for a plurality of adjustment points at which a plurality of frequency adjustment points that correspond to output frequencies of the high frequency power source are combined with a plurality of electrical characteristic adjustment points that correspond to electrical characteristics of the variable electrical characteristic element; a high frequency information detection unit for detecting high frequency information of the input end; an output frequency acquisition unit for acquiring an output frequency of the high frequency power source; an electrical characteristic acquisition unit for acquiring an electrical characteristic of the variable electrical characteristic element; a characteristic parameter acquisition unit for acquiring a characteristic parameter for an adjustment point at which the acquired output frequency is combined with the acquired electrical characteristic, based on the plurality of characteristic parameters; an output reflection coefficient calculation unit for calculating an output reflection coefficient of the output end, based on the high frequency information detected by the high frequency information detection unit and the characteristic parameter acquired by the characteristic parameter acquisition unit; a specifying unit for specifying an impedance adjustment point at which to match the target impedance to the impedance of the high frequency power source, among the plurality of adjustment points, based on the output reflection coefficient, a target input reflection coefficient set in advance, and the plurality of characteristic parameters; an electrical characteristic element adjustment unit for adjusting the electrical characteristic of the variable electrical characteristic element to an electrical characteristic of the impedance adjustment point; and a command signal output unit for outputting, to the high frequency power source, a command signal for adjusting the output frequency of the high frequency power source to an output frequency of the impedance adjustment point.