Dielectric resonator and filter with low permittivity material

摘要

A resonator cavity (60) for supporting a plurality of resonant modes and filtering electromagnetic energy includes a cavity (61) and a resonator element (68) with a mounting flange (67). The cavity is defined by a top end wall (62), a bottom end wall (63) and a sidewall (64) and has a longitudinal axis (B) along its length is defined. The resonator element is positioned within the cavity along the longitudinal axis and includes a mounting flange (67). The dimensions of the cavity and the resonator element are selected so that the associated electromagnetic energy is defined by an electromagnetic field pattern that substantially repeats itself at least twice along the length of the resonator.