TH3A: Multi-band and multi-mode planar filters

This session focuses on the latest progress in the design and implementation of multi-band or multi-mode filters. The first two papers report dual-band filters that can be used in multi-functional RF front-ends. The first one uses substrate-integrated-waveguide (SIW) technology, and the other one uses conventional microstrip technology for implementation. The last three papers present several innovative tri-mode resonators and their application in high-performance filter designs. Improved performance such as out-of-band transmission zeros or reduced filter size are demonstrated with the use of these multi-mode resonators.