A new class of dual-mode asymmetric microwave rectangular filters

Satellite communications are used extensively today. The separation of the different frequency channels requires greater selectivity. Designers have unanimously adopted the circular filters to do this task. But the circular waveguides require a very long, hard development process. We present, in this paper, a new method of filtering based on rectangular geometry. We give a new synthesis procedure and we show that this original configuration can create zeros at right or left hand of the band. With a very powerful computational circuit and electromagnetic analysis, the design needs less tuning. To validate this new concept of filtering, we present the measurements of two TE₁₀/TE₃₀ rectangular dual-mode filters