This letter presents a novel type of compact, low insertion loss (IL) planar microstrip filter, which is mainly composed of two hybrid resonators with a mixed electric/magnetic (EM) coupling between them. Tunable EM coupling is constructed to realize a tunable transmission zero (TZ) very close to the passband. And two folded T-shaped feed lines are adopted to introduce another tunable TZ and obtain a desired external coupling. Advantages of the proposed filter are not only its compact size and low IL, but also its tunable TZs.
No takes yet. Share an insight, caveat, or question.
Zong et al. (2015) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: