Abstract
In this article, a novel idea to introduce two coupling paths including one electric coupling and one mixed electric and magnetic coupling between adjacent resonators is proposed. Theoretical exploration based on equivalent circuit model reveals that two adjustable finite transmission zeros can be generated to improve filter performances as the result of the interaction of the two paths for either electric domain or magnetic domain coupling. As an example, a microstrip filter is designed, fabricated and measured using the proposed configuration. The measure results validate and confirm the feasibility of the proposed design methodology.
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