Computer aided design for new microwave filter topologies for spatial applications in Ka band

This paper presents, in the first part, an original topologie of dielectric resonators for multilayer filter applications in Ka band. The resonant ele ment is defined by a partially metallized dielectric plate enclosed in a pa rallelepipedic cavity. This topology allows a high integration in a planar environment type and presents high electrical performances too. It is easil y manufactured, and suitable for high frequencies filtering and power appli cations. Irt order to realize multipole filters without tuning a direct ele ctromagnetic optimization method developed in our laboratory is applied. Th is method combines a electromagnetic software based on the finite element m ethod, and a specific one to establish the identified coupling matrix deduc ted from the filter responses. Some experiments are performed to verify the theoretical design. In the second part, we consider a new global function which combines filter ing and radiating characteristics. For the first time, an opened tuning les s two-pole filter defined by two superposed resonators coupled by a metalli c iris is designed Its filtering and radiating functions are optimized in t he same time to present required electrical performances.