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Utilization of Higher Order Dual-Post Resonance Modes for Advanced Coaxial Filter Designs

The inherent phase reversal of the higher order mode, or odd mode, of close dual-post configurations is exploited in the design of pseudo-elliptic filters with transmission zeros at finite frequencies. This phase transformation allows the realization of negative coupling coefficients in coaxial technology without using traditional probes. Design guidelines in regards to control of the elements of the equivalent circuit are discussed. The approach is illustrated at the example of quadruplet filters at 2.6 GHz with two TZ's at finite frequencies. Full-wave simulation results confirm the validity of the approach.