AAWSAP DIRD, Pulsed High-Power Microwave Source Technology, January 2010

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Conclusion
This paper provided an overview of the current state of HPM sources and the
technologies driving their development. Advanced cathode materials, computer codes
for more predictive ability in electron beam generation and propagation, high-speed
switching at high power, and low-loss insulation techniques are just a few of the areas
where advancement clearly is needed for progress to occur. Advancements in
photoconductive solid-state (PCSS) and other solid-state switching and sharpening
devices appear to finally be reaching a level of development such that they may soon
be of use in high-voltage systems. If PCSS switching devices capable of higher
operating voltage and extended lifetime are made available, variations of the phased
array will become the HPM source design of choice, given the inherent advantages.
More compact antennas are greatly desired; however, the physics of the radiation
process requires structure sizes on the order of one-half wavelength of the lowest
rad iated frequency. With demanding levels of directivity and gain also requirements,
compact UWB antenna designs will continue to be difficult, if not impossible, to realize.
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