Patent ID: 7426373

Claim:
A tuning apparatus for tuning an impedance of an antenna coupled to an electromagnetic wave transmitter, the apparatus comprising: a piezoelectric capacitor; a magnetostrictive inductor coupled in parallel with the piezoelectric capacitor to form a resonance circuit, said resonance circuit being in electrical communication with said antenna; a biasing circuit for biasing each of said piezoelectric capacitor and said magnetostrictive inductor to thus alter a resonant frequency of said resonance circuit; said biasing circuit including: a voltage controller for controlling a bias voltage applied to said piezoelectric capacitor; and a current controller for controlling a bias current applied to said magnetostrictive inductor; and a controller for generating a pair of independent control signals applied independently to said voltage controller and to said current controller to independently control a magnitude of each of said biasing current and said bias voltage, to control said biasing circuit in accordance with a frequency of said transmitter to match said impedance of said antenna to said impedance of said transmitter.