Miniature Triple-Mode Dielectric Resonator Filters

Mustafa Safaa Ahmed Bakr, Ian Hunter, Wolfgang Bösch

Research output: Contribution to journalArticlepeer-review


In this paper, a new class of triple-mode microwave filters is presented. These devices use the degenerate pair of the H E 11δ mode and the single T M 01δ mode in dielectric-loaded cavities with an unloaded Q-factor of 3000-5000 and reasonable spurious-free window. The proposed structure is obtainable in less than one-quarter of the physical volume of equivalent TEM filters. A finite-element method solver for electromagnetic structures (HFSS) is used to study the main properties of this resonator. Fundamental design rules for triple-mode bandpass filters with controllable finite transmission zeros are presented. Design examples of bandpass filters with finite transmission zeros on the high or low or both sides of the passband are demonstrated. Measured results demonstrate excellent performance.
Original languageEnglish
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
Publication statusPublished - 2018

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