Patent ID: 6690251
Filing Date: 2004-02-10
Classification: G01R,H01G,H01L,H01P,H03B,H03F,H03H,H03J,H03L,H04B

Abstract:
A tunable electromagnetic signal filter comprising:a dielectric constant adjustment signal generator for generating a dielectric constant adjustment signal; an element having a capacitance and a quality factor; a volumetric resonator; the element and the resonator configured as an electromagnetic signal filter having a resonant frequency; a ferro-electric material positioned proximate the first element for adjusting, responsive to the dielectric constant adjustment signal, the capacitance of the first element for adjusting the resonant frequency; and wherein the quality factor, when operated in a temperature range between about âˆ’50 degrees Celsius and 100 degrees Celsius, is greater than about 180 in a frequency range between 0.25 GHz and 7.0 GHz.