2008•IEEE Microwave and Wireless Components LettersRequires access

Design of Microstrip Dual-Mode Filters Based on Source-Load Coupling

Xiaochuan Zhang, Zhiyuan Yu, Jun Xu

Abstract

In this letter, a novel circular open-loop resonator is presented. The field patterns of this type of dual-mode resonator are investigated using full-wave electromagnetic simulations. The applications of the dual-mode resonator as bandpass filters are proposed. A coupling and routing scheme is presented to model the operations of these filters. Advantages of using this type of filter are not only its low insertion loss, but also its controllable transmission zeros. Both simulated and measured results are presented.

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Key concepts: Resonator, Band-pass filter, Microstrip, Coupling (piping), Electronic engineering, Insertion loss, Dual mode, Filter (signal processing)