Patent ID: 6989721

Claim:
An adaptive controller for adaptively controlling a plurality of variable high frequency devices, said adaptive controller comprising: a calculation part that calculates a scalar function value by using a signal varied in accordance with impedances of the variable high frequency devices, a reference signal, and a predetermined scalar function; an impedance variation part that creates a signal that sequentially varies the impedances of the variable high frequency devices; and a determination part that, when an impedance of one of the variable high frequency devices is varied, determines whether a direction in which the scalar function value is varied is in a predetermined sloped direction, the impedance variation part comprising: a first variation part that, when the determination part determines the direction in which the scalar function value is varied is in the predetermined sloped direction, creates a signal that further varies the impedance of said one of the variable high frequency devices in the predetermined sloped direction; and a second variation part that, when the determination part determines the direction in which the scalar function value is varied is not in the predetermined sloped direction, creates one of a signal that varies the impedance of said one of the variable high frequency devices in a oppositely sloped direction and a signal that varies an impedance of another one of the variable high frequency devices.