Crosspolar control in far-field synthesis of dual offset reflectors
作者:
B.S.Westcott,
F.Brickell,
I.C.Wolton,
期刊:
IEE Proceedings H (Microwaves, Antennas and Propagation)
(IET Available online 1990)
卷期:
Volume 137,
issue 1
页码: 31-38
年代: 1990
DOI:10.1049/ip-h-2.1990.0006
出版商: IEE
数据来源: IET
摘要:
The possibility of synthesising dual offset reflector systems to produce a prescribed far-field power pattern with no depolarisation is examined under the principles of geometrical optics. A formulation is developed based upon a model in which both source and antenna far fields are represented by Huygen's fields. Numerical implementation in general appears difficult but a useful special case emerges in which the reference axes of the Huygen's fields are parallel. Results for a contoured beam application reveal that a shaped dual offset system with no optical depolarisation is possible, and further analysis using physical optics suggests that extremely good axial ratios can be obtained.
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