Low phase-noise device comprising a microstrip-mounted coaxial dielectric resonator and method of reducing the phase noise in such a device, in particular in a voltage-controlled oscillator

摘要

A low phase-noise device, like e.g. a microstrip-mounted voltage- controlled oscillator (VCO) is described, and also a method of reducing such a noise in such devices or other devices comprising a microstrip- mounted coaxial ceramic resonator. In practice, a recess is made in the metallic support, opening towards the substrate, extending beneath the terminal area of the ceramic resonator or, possibly, even beyond it. Said recess is filled with air and the layer of electrically conducting material between the substrate and the metallic support at said recess is removed.