Studies of dual channel, polarisation agile, quad-ridge and octo-ridge feeds suggest that mode degeneracy in multi-ridge structures severely constricts operational bandwidths, for a large range of ridge dimensions. Mode characteristics in dual-ridge, quad-ridge and octo-ridge waveguide are examined in this paper, with a view to identifying both the nature of the degeneracy, and its implications for bandwidth. The results presented have been generated using a full-wave finite element electromagnetic field simulator.
2. Hopfer, S., "The design of ridge waveguide," IRE Transactions on Microwave Theory and Techniques, Vol. 3, No. 10, 20-29, 1955.
doi:10.1109/TMTT.1955.1124972
3. Rong, Y. and K. A. Zaki, "Characteristics of generalised rectangular and circular ridge waveguides," IEEE Trans. MTT, Vol. 48, No. 2, 258-265, 2000.
doi:10.1109/22.821772
4. Tsandoulas, G. N. and G. H. Knittel, "The analysis and design of dual-polarisation square waveguide phased arrays," IEEE Transactions on Antennas and Propagation, Vol. 21, 796-808, Nov. 1973.
5. Chen, C. C., "Quadruple ridge-loaded circular waveguide phased arrays," IEEE Transactions on Antennas and Propagation, Vol. 22, 481-483, May 1974.
doi:10.1109/TAP.1974.1140797
6. Chen, C. C., et al., "Modal characteristics of quadruple-ridge circular and square waveguide," IEEE Transactions on Antennas and Propagation, Vol. 22, 801-804, August 1974.
7. Chu, T.-T. and A. Larussi, Quad ridged feed horn with two co-planar probes, US Patent No. 6,624,792 B1, Sept. 23, 2003.
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