Novel Implementations for Microstrip Resonator Filters in Transversal and Alternative Topologies

摘要

This paper presents novel and compact implementations of microstrip filters using transversal topologies. Thestructures proposed are based on source/load­multiresonatorcoupling, and implement different topologies, allowing the synthesis of different frequency responses with transmission zerosfor maximum selectivity. Design guidelines for different resonatortopologies are also reported to show the possibilities of the proposed structures. The analyzed characteristics of these filters,obtained with commercial full-wave computer-aided tools, showexcellent agreement with synthesis results. Several filter prototypes of third order, showing different frequency responses,are manufactured and tested, obtaining good agreement withtheoretical predictions.