Patent ID: 7426373
Filing Date: 2008-09-16
Classification: H01Q,H03J,H04B

Abstract:
1. 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 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.