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Transient Behavior of Aperture Antennas

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1 Author(s)
Polk, Charles ; University of Rhode Island, Kingston, R.I.

The transient behavior of aperture antennas is analyzed. For an antenna which is illuminated by a field of uniform phase and either uniform or cosine tapered amplitude, it is shown that the steady-state main lobe is established within (¿/2+R/c) seconds after the aperture is energized. ¿ is the period of the carrier frequency, R is the distance from the center of the aperture to the point where the field is evaluated, and c is the velocity of light. The time required for the establishment of the steady-state pattern at all angles between 0° and 90° is (¿/2¿0+ R/c) where 2¿0 radians is the beamwidth between first nulls of the steady-state pattern (¿0<

Published in:

Proceedings of the IRE  (Volume:48 ,  Issue: 7 )