CST – Computer Simulation Technology

Novel Multiplexer Topologies Based on All-Resonator Structures
Xiaobang Shang, YiWang, Wenlin Xia, Michael J. Lancaster
IEEE Transactions on Microwave Theory and Techniques
Volume: 61, Issue: 11, November 2013
3838 - 3845
Coupling matrix optimization, diplexer, multiplexer, resonator filters
This paper presents two novel multiplexer topologies based on all-resonator structures. Such all-resonator structures remove the need for conventional transmission-line-based splitting networks. The first topology is a diplexer with transmission zeros in the guard band, shared by both channels. These transmission zeros are generated by introducing a cross coupling in a quadruplet in resonators common to both channels. A twelfth-order diplexer with a pair of transmission zeros is presented here as an example. The second topology is a multiplexer with a bifurcate structure that limits the connections to any resonator to three or less, regardless of the number of output channels. A sixteenth-order four-channel multiplexer is presented as an example. Both topologies have been demonstrated at -band using waveguide technology. Good agreements between measurements and simulations have been achieved.

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