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Off‐axis performance of shaped antennas at millimeter wavelengths
Author(s) -
Hudson Jerome A.
Publication year - 1989
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs024i004p00417
Subject(s) - millimeter , optics , wavelength , curvature , feed horn , fresnel zone antenna , physics , coma (optics) , aperture (computer memory) , directional antenna , computation , horn antenna , extremely high frequency , computer science , mathematics , geometry , radiation pattern , telecommunications , antenna (radio) , acoustics , slot antenna , algorithm , periscope antenna
Antennas which have been shaped for optimal aperture efficiency will not give sharp off‐axis images. This is true for even quite small fields of view. The shaping to match feed horn illumination is at fault here; it leads inevitably to severe coma and curvature of the field. The analysis presented here is based upon geometrical optical computations.