HETEROZYGOUS DIELECTRIC RESONATOR AND BAND-PASS FILTER THEREWITH

摘要

PURPOSE: A heterozygous dielectric resonator and a band-pass filter therewith is provided to guarantee a temperature stability and utilize more kinds of dielectric substance having various characteristics for the resonator and filter therewith. CONSTITUTION: A heterozygous dielectric resonator and a band-pass filter therewith includes 1/4 wavelength (lambda) resonator which is generally a cylindrical coaxial type. A body(10) of the resonator has a longitudinal hole(11), and is coated with a conductive material(12) on the inside and the outside of the cylindrical type. A side of the hole(11) is opened and the other side is closed as an open side(13) and a short-circuit side(14). The dielectric substance includes a dielectric material having a high permittivity(epsilon r) and a low dielectric loss(tan delta). The dielectric substances includes a negative(-) temperature coefficient and a positive(+) temperature coefficient of a resonant frequency(tau f) are longitudinally connected in a determined longitudinal ratio. The first dielectric material(20), connected the short-circuit side(14), has a bigger dielectric constant than a second dielectric material(30), to shorten a total length of the resonator.