Title :
Microwave filters with improved spurious performance based on sandwiched conductor dielectric resonators
Author :
Weily, Andrew R. ; Mohan, Ananda S.
Author_Institution :
Fac. of Eng., Univ. of Technol., Sydney, NSW, Australia
fDate :
8/1/2001 12:00:00 AM
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 Q, 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
Keywords :
Q-factor; S-parameters; dielectric resonator filters; elliptic filters; finite difference time-domain analysis; microwave filters; S-parameters; cylindrical cavity; finite difference time domain method; four-pole elliptic filter; microwave filter; mode chart; one-pole filter; resonant frequency; sandwiched conductor dielectric resonator; screw coupling; slot coupling; spurious characteristics; unloaded Q-factor; Band pass filters; Conducting materials; Conductors; Dielectric measurements; Finite difference methods; Insertion loss; Microwave filters; Performance loss; Resonator filters; Time domain analysis;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
