Abstract
A 3-D shaped prolate ellipsoidal dielectric lens is designed to produce multiple asymmetric beams in Ka-band. Such radiation characteristics are useful in applications where the antenna system is mounted on platforms ∞ying above Earth and the shape of the footprints have to be carefully controlled for difierent elevation angles. A set of design rules is introduced and the flnal designs are optimized using full-wave time-domain methods. A fully operational Ka-band antenna subsystem has been prototyped and measured. The flnal antenna lens has axes lengths of 62.3mm and 57.8mm and provides a maximum gain of 21dB. When mounted on a stabilized platform at the altitude of 21km (a typical HAPS scenario), this antenna provides 19 circular ground footprints of 5km diameter each. Radiation pattern measurements show that such a lens reduces the natural beam footprint elongation unavoidable with traditional spherical lenses and conflrm the validity of the proposed system.
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