Harmonic Phase Responses of Radio Frequency Electronics: Wireline Test

Report No. ARL-TR-7552
Authors: Gregory J Mazzaro, Sean F McGowan, Kyle A Gallagher, Anthony F Martone, and Kelly D Sherbondy
Date/Pages: December 2015; 32 pages
Abstract: This report describes the phase response of electronic nonlinear-radar targets illuminated by a single frequency stepped across a wide bandwidth. The amplitudes and phases of harmonics generated by each target at each tone are captured, and a nonlinear reflected transfer function is constructed for each target at selected transmit powers. Reception of at least 1 harmonic indicates detection of a nonlinear target. The derivative of the reflected phase data with respect to radian frequency indicates the range to the nonlinear target. Data are presented for coaxial-line tests at transmit frequencies between 800 and 900 MHz and for a distance of 24 ft. The current experiment is wireline, but it may be extended to the wireless case. Successful tests confirm that the harmonic phase responses of radio frequency electronic targets of interest are, in fact, constant versus frequency across a wide bandwidth; therefore, the stepped-frequency technique is generally applicable for detecting and ranging such targets.
Distribution: Approved for public release
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Last Update / Reviewed: December 1, 2015