Patent ID: 6097263
Filing Date: 2000-08-01
Classification: H01P,Y10S

Abstract:
A tunable electromagnetic resonating apparatus, comprising:a cavity for resonating at a cavity resonant frequency in response to electromagnetic energy received by said cavity;an input for inputting said electromagnetic energy into said cavity;an output for outputting said electromagnetic energy from said cavity;a resonator coupled to said cavity for altering the cavity resonant frequency, said resonator comprising a dielectric material having an electric permittivity that is a variable function of a voltage applied to said dielectric material, and a pair of spaced-apart conductors, said pair of spaced-apart conductors being located on a common surface of a substrate, the dielectric material being located in a gap between the conductors;a biasing circuit for applying said voltage to said dielectric material;a leakage controller for inhibiting coupling of the electromagnetic energy to said biasing circuit, said leakage controller being operatively connected to said biasing circuit;a sensing device operatively connected to the cavity for determining the cavity resonant frequency and generating a signal in response thereto;a variable power source connected to said biasing circuit for appylying power thereto; anda control device connected to the variable power source and sensing device for receiving the signal and generating a control signal in response thereto, wherein the variable power source applies power to the biasing circuit in response to said control signal, wherein said cavity resonant frequency is altered by altering said electric permittivity in response to altering of the applied voltage.