Abstract:
Microwave filters based on a novel resonator comprised of a
sandwiched conductor dielectric resonator (SCDR) loaded in a cylindrical
cavity are analyzed in this paper. The SCDR is a compact resonator that exhibits
good spurious performance. Resonant frequencies of the lower order
modes are analyzed, and mode charts, unloaded , slot coupling, and screw
coupling graphs are presented. S-parameters are computed using the finite-
difference time-domain (FDTD) method for one- and four-pole SCDR
filters and compared with measured results. The measured spurious performance
for the four-pole elliptic function filter shows a large improvement
over conventional dielectric-resonator filters. The measured results agree
closely with predicted values obtained using the FDTD method.
