Physical encryption by the transmission of nonperiodic signal sets with a phased array

A system capable of generating continuous and nonperiodic of multiple frequen- cies and shape is constructed. Using user defined nonperiodic signals, a novel phys- ical layer encryption technique is experimentally verified via the synthetization of frequency specific, continuous signals in free space. In order to take advantage of nanosecond impulses transmitted in the time domain, a TEM Horn antenna with a Chebyshev taper is implemented. The time-domain impulse response of the TEM Horn is verifed theoretically and experimentally. Further experiments verify the re- gion in which the intended signal is received, and the limits of the area based on an antenna array configuration is established. Comparisons of modern physical layer en- cryption techniques are made to the results shown, and how the proposed technique quells a common drawback from other established techniques.