Optimized Design of a Broadside-Coupled Suspended Stripline Filter

摘要

In this article an optimized design flow for the layout of a broadside-coupled suspended stripline filter is outlined. The parameters of the equivalent circuit of the coupling region between two resonators are extracted from a full 3D electromagnetic field simulation in order to get parameter values which are as close as possible to that of the realized filter structure. The synthesis of the complete filter is done using an analytical model containing the extracted values. With the design procedure described in this article an ultra wideband filter with a passband from 50GHz to 67GHz and an isolation of about 65dB has been designed and implemented. The presented measurement results show a very good agreement with the simulations. The filter exhibits an insertion loss of 2.5dB.