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Microwave filters with improved spurious performance based on sandwiched.pdf

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Microwave filters with improved spurious performance based on sandwiched

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 49, NO. 8, AUGUST 2001 1501 Microwave Filters With Improved Spurious Performance Based on Sandwiched Conductor Dielectric Resonators Andrew R. Weily and Ananda S. Mohan 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 ex- hibits 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 fi- nite-difference time-domain (FDTD) method for one- and four-pole SCDR filters and compared with measured results. The measured spurious perfor- mance 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. Index Terms—Dielectric-resonator filter, FDTD analysis, mode chart, sandwiched conductor dielectric resonator, spurious performance. I. INTRODUCTION Mobile communication systems require filters that have good in-band performance in terms of loss and good out-of-band spurious performance. Filters composed of dielectric resonators (DRs) give excellent in-band performance, but have poor spurious characteristics due to their crowded mode spectrum. The key issue in obtaining wide spurious rejection performance from a filter is to optimally design the resonator to give a well-spaced mode spectrum. Charts have been presented by Kobayashi and Miura specifically for this purpose [1]. When using the TE01-mode DR, introducing a concentric hole can markedly improve the spurious performance [1], [2]. Many other techniques have also been presented over the years to further improve the spurious performance of DR filters. Quarter-wavelength coaxial TM01-mode DRs have been shown to h