Bandwidth characteristics for the stepped conical-zoned antenna

James C. Wiltse

doi:10.1117/12.477417

1 August 2002 Bandwidth characteristics for the stepped conical-zoned antenna

James C. Wiltse

Proceedings Volume 4732, Photonic and Quantum Technologies for Aerospace Applications IV; (2002) https://doi.org/10.1117/12.477417
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

The stepped conical zoned lens antenna has better overall efficiency than a true lens, and provides an excellent antenna pattern. It also exhibits somewhat different bandwidth characteristics than the Fresnel zone plate antenna. This paper examines the frequency behavior in detail, particularly for microwave and millimeter-wave applications. For the usual zone plate antenna employed at microwave or millimeter wavelengths, path length adjustment (i.e., phase correction) is accomplished by cutting different depths (grooves) in a dielectric plate or by using two or more dielectrics having different dielectric constants. The new design uses a tilted cut in a flat dielectric plate, which more accurately matches the shape of a true lens and produces much lower phase error. The construction is still linear (i.e. spherical or hyperboloidal curves do not have to be cut), and can be made, for example, by a milling machine with a tilted bit. For a circular zone plate, the lens is a stepped conical shape. The phase correction steps are small, usually a few degrees, which is much smaller than for the typical Fresnel zone plate. The bandwidth characteristics are calculated for specific cases.

Citation Download Citation

James C. Wiltse "Bandwidth characteristics for the stepped conical-zoned antenna", Proc. SPIE 4732, Photonic and Quantum Technologies for Aerospace Applications IV, (1 August 2002); https://doi.org/10.1117/12.477417

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