An Efficient EM-Based Synthesis Technique for Single-Band and Dual-Band Waveguide Filters

This paper presents a systematic and an efficient synthesis technique for designing single-band and dual-band waveguide filters with transmission zeros. The proposed EM-based synthesis technique directly results in a filter design with an RF performance that is in excellent agreement with the ideal filter performance, thus significantly reducing the post fine optimization effort. Furthermore, the proposed technique also reduces the EM simulation resources required for the filter synthesis. The synthesis technique is lucidly explained by designing a symmetrical 6th order waveguide filter with 4 transmission zeros, a 9th order filter with 3 asymmetric transmission zeros and a 6th order dual-band filter. To the best of author’s knowledge, this is the first filter synthesis technique, which can be adopted to design waveguide filters including transmission zeros with minimum or no post fine optimization.