A new procedure for synthesising filters with finite dissipative loss is presented. This method enables filters with finite Q resonators to be directly synthesised while maintaining a prescribed selectivity in the passband. Previous methods of synthesis using pre-distortion and reflection mode type networks are compared. Numerical examples for a 5th degree Butterworth are given.

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A demand for high power filters is met by a theoretical procedure to produce prototype networks designed to minimise peak voltages occuring due to stored energies in resonant cavities. The stored energies are re-distributed within the filter. This is in contrast to previous techniques which have looked at physical design methods to minimise breakdown in the various technologies used for realisation. Limitations are placed on the optimisations to ensure practical topologies are generated. A 4th Degree Chebychev coaxial resonator type filter is developed using the new procedure. The peak fields responsible for breakdown at high incident power levels are reduced. This allows greater power handling capacity when compared to conventional network topologies producing the same overall small-signal transfer function.A 4th Degree Chebychev filter is designed for implementation using coaxial resonator technology. Additional external couplings and cross-couplings are introduced to distribute the large stored energies from the second cavity into the fourth cavity. When compared to the ladder network significant reduction of peak voltages in the second cavity is obtained by increasing the level of peak voltage in the fourth to an equal value.