Microwave Filters With Improved Spurious Performance Based on Sandwiched Conductor Dielectric Resonators

IEEE-Institute of Electronics Engineers Inc.
Publication Type:
Journal Article
IEEE Transactions on Microwave Theory and Techniques, 2001, 49 (8), pp. 1501 - 1507
Issue Date:
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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. -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
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