Abstract
ABSTRACT This paper presents several topics on the beam efficiency of a reflector antenna. (i) A simple definition for the “main beam” is suggested for calculating beam efficiency. This definition is related to the reflector aperture diameter, but is independent of the feed edge taper. Use of this definition allows a fair comparison of beam efficiencies due to different feeds to be made. (ii) Physical optics theory does not conserve power. Therefore conventional reflector pattern computation methods based on PO can calculate beam efficiency only within 2% to 3% accuracy. A method for calibrating out this PO error is described. (iii) Beam efficiency curves are presented for typical parabolic reflectors fed by open-ended circular cylinder waveguide feeds. While directivity is optimized by a 10 dB edge taper, beam efficiency is optimized for a higher edge taper of over 20 dB. (iv) Beam efficiency curves for cases in which the beam is scanned off-axis are presented. (v) A cluster feed is utilized to improve b...
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