Practical considerations on the design and optimization of substrate integrated coaxial filters

A practical approach for the design and optimization of substrate integrated coaxial filters is presented in this work. The technique is based on the electromagnetic optimization of the 3D filter by using a circuit-level model of the structure. As an example, a 6-pole filter with quasi-elliptic response and tight requirements in terms of group delay flatness has been designed, manufactured and measured. The proposed approach can be used on any cross-coupled substrate integrated coaxial filters and can help to minimize the computational effort and number of design iterations required for satisfying stringent filter specifications.

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