New design methodology for multiband waveguide filters based on multiplexing techniques

This paper introduces a new design methododology for multiband waveguide filters based on a manifold approach. The new design algorithm is based on a subtle modification of the well-known multiplexer design algorithm. Transmission zeros, enhancing the overall performance, are also shown to be naturally produced. In addition to theory, the measured performance of a multiband filter is shown indicating very good agreement with the simulated response, thereby fully validating the new design methodology.