One approach to a transient electromagnetic radiator is an impulse radiating antenna (IRA) [1]. In this case an antenna aperture is focused at infinity. While there are several ways to realize an IRA (reflector, lens, array), the reflector type is very practical, especially for large ones, if electronic beam steering is not required. Basic physical considerations are discussed in [2]
What if, instead, one has a target which is relatively close to the antenna so that focusing at infinity may not be appropriate. Focusing at the target can then be used to increase the field strengths there [3, 4]. Such is the subject of the present paper.
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Baum, C.E. (2007). Producing Large Transient Electromagnetic Fields in a Small Region: An Electromagnetic Implosion. In: Baum, C.E., Stone, A.P., Tyo, J.S. (eds) Ultra-Wideband Short-Pulse Electromagnetics 8. Springer, New York, NY. https://doi.org/10.1007/978-0-387-73046-2_14
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