Modal-S-Matrix Design of Optimum Stepped Ridged and Finned Waveguide Transformers
- 1 June 1987
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 35 (6), 561-567
- https://doi.org/10.1109/tmtt.1987.1133704
Abstract
Optimum stepped transformers from rectangular wavegnide to ridged and all-ruetat finned waveguides are designed with the method of field expansion into eigenmodes, which inclirdes bigher order mode inter- action between the step discontinuities. Computer-optimized design data are given for a Ku-band ridged waveguide prototype with a ridge width of 1 mm, as well as for Ku-band and E-band finned wavegnide transformers with commerciatfy available metaf fin thicknesses of 0.19 mm and 0.1 mm, respectively, snitable for metaf-etchirrg manufacturing techniqne. The opti- mum designs achieve a minimum return loss of abont 36 dB, or 34 dB for the whole Ku- or E-band, respectively. The theory is verified by compari- son with measured resntts.Keywords
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