Off-axis-fed fresnel zone plate antenna

James C. Wiltse

doi:10.1117/12.2298257

14 December 1992 Off-axis-fed fresnel zone plate antenna

James C. Wiltse

Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19293W (1992) https://doi.org/10.1117/12.2298257
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States

Abstract

Phase-correcting zone plates may be used with off-axis feeds. For angles up to about 20Ã‚Â° off-set, the performance is well-behaved, with minor degradation. The design is given for a transmission type and an equivalent reflecting version having a 17Ã‚Â° feed offset. An investigation has been carried out for angles larger than 20Ã‚Â°, apd the results indicate that the annular zones on the zone plate should not be circular. A ray- tracing analysis shows that the zones need to be egg-shaped, and these results will be described. The analysis has been completed for both transmission or reflection-type zone plates.

Citation Download Citation

James C. Wiltse "Off-axis-fed fresnel zone plate antenna", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19293W (14 December 1992); https://doi.org/10.1117/12.2298257

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