Abstract
Numerical techniques permit now to analyze rigorously complex voluminous ar planar microwave devices. In this paper, a rigorous design of dielectric resonator filters applying the finite element method is described. We first present a dual mode coupling technique which replaces classical dielectric resonators, coupling and tuning screws commonly used in dual mode filters, by slotted dielectric resonators. Next, to explain the generation of transmission zeros in the insertion loss performance of microwave filters, we define a new theoretical analysis based on the contribution of the first dielectric resonator hybrid mode and of higher order modes. This analysis can be applied to any type of microwave dual mode filter. Finally, a synthesis method applying the finite element method, is developed to design rigorously for the first time, a four and a eight pole slotted dielectric resonator elliptic filters. The experimental results obtained with no tuning and the theoretical ones show good agreement.
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