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Performance and design procedure of dual parabolic cylindrical antennas

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2 Author(s)
Sanad, M.S.A. ; Dept. of Electr. Eng., Mam.,itoba Univ., Winnipeg, Man., Canada ; Shafai, L.

The radiation characteristics of dual parabolic cylindrical antennas are studied, and the dependence of the principal plane beamwidths and the peak cross-polarization on their geometrical parameters is determined. The antenna aperture is rectangular in shape and generates an elliptical beam pattern, with a beamwidth ratio that can be controlled by the main and subreflector focal lengths. The far-field patterns are determined by an extended aperture integration method that includes the contributions of the reflected and the main diffracted rays. It is found that the cross-polarization depends of the offset angle between the axis and the direction of the normal to the subreflector surface and can be minimized by optimizing the relative angle between the reflectors. Other pattern characteristics are controlled by the antenna geometrical parameters and the feed illumination. A procedure for the design of these antennas and the expressions for determining the reflector geometries are provided

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:36 ,  Issue: 3 )

Date of Publication:

Mar 1988

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