Field theory design of square waveguide iris polarizers
Abstract
Profiled depth-corrugated square waveguide polarizers are designed with the method of field expansion into eigenmodes, which includes higher order mode interaction between the step discontinuities. Computer-optimized design data are given for a compact Ku-band prototype with an exponentially varying depth function, that achieves 90 + or - 1 deg differential phase shift within the separate 11.9-12.3-GHz and 17.5-17.9-GHz frequency bands. The maximum voltage standing-wave ratio is only about 1.02. Further design examples include a linearly profiled depth function, which provides a short design, and a polarizer with iris thicknesses suitable for metal-etching manufacturing technique. The theory is verified by comparison with available measured results.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- January 1986
- DOI:
- 10.1109/TMTT.1986.1133293
- Bibcode:
- 1986ITMTT..34..156T
- Keywords:
-
- Computer Aided Design;
- Field Mode Theory;
- Polarizers;
- Rectangular Waveguides;
- Optimization;
- Phase Shift;
- Superhigh Frequencies;
- Communications and Radar