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Center-fed parabolic reflector antenna cross polarization due to slightly right-left asymmetric feed patterns

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1 Author(s)
Miyata, K. ; Akita National Technical College, Akita-Shi, Japan

Slightly right-left (R-L) asymmetric feed pattern effects on a center-fed parabolic reflector antenna cross polarization have been described with some numerical computation examples, noting that measured feed patterns, both in theEplane and in theHplane, are generally not completely R-L symmetric and have a slightly different R-L field intensity which produces asymmetrical reflector surface currents. It is shown from the numerical computations that even a slight feed asymmetry, in both amplitude and phase, gives rise to a cross polarization in the secondary prinicpal planes and that, in particular, phase R-L asymmetry incurs two-dimensional movement of principal- and cross-polarized patterns resulting in the rapid increase of principal-plane cross polarization as well as the maximum cross polarization, principal-pattern beamshift, and the sidelobe variations.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:28 ,  Issue: 2 )

Date of Publication:

Mar 1980

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