Abstract
In a previous paper, closed-form time-domain expressions of the prompt responses along the axis of such an antenna have been derived, assuming a focused primary point source. In this communication, the formulas are generalized to a defocused primary point source laying on the axis. The new closed-form expressions are valid along the axis, near and far from the reflector. A closed-form expression of the impulse duration is also given. The analytical results show that defocusing may produce significant transient electromagnetic field on the axis.
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