Computer-aided design (CAD) of filters and multiplexers for passive inter-modulation (PIM) set-ups

This paper is focused on the computer-aided design (CAD) of filters and manifold-coupled multiplexers for passive inter-modulation (PIM) measurement test beds. After a brief summary of the demanding requirements to be satisfied by these components, two novel topologies of rectangular waveguide filters conceived for this particular application are presented. Next, the procedure carried out for the design of the filters and involved multiplexers is outlined. Finally, the performance of two wideband manifold-coupled multiplexers for PIM measurement set-ups (operating at Ku- and K-bands) is fully validated with experimental measurements.