Band-pass waveguide filters and multiplexers design by the structure segmentation technique

Abstract

This work presents a technique for the efficient design of bandpass waveguide microwave filters using a segmentation technique. The segmentation technique was originally developed for in-line filters, and the main contribution of this work is in the combination of this technique with the coupling matrix formalism. In this way we have used this useful design technique for complex coupling topologies, beyond the in-line configuration. As an example some dual mode filters are designed using the new coupling matrix formalism, validating the theory presented.

In addition, this technique has been used in the design of diplexers and triplexers with the previously designed filters.

Furthermore, a novel dual-mode filter topology that can be implemented through this technique is proposed. Finally, in order to validate these contributions, a dual-mode filter has been designed with the introduced topology for a real application in the space sector in collaboration with the European Space Agency.