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The Lienard-Wiechert potentials show explicitly that charge acceleration, i.e., a change in charge velocity, causes radiation of an electromagnetic field. The goal of this discussion is to explore the rate of energy loss due to radiation from current and charge flowing on a circular loop as a function of the loop’s circumference (or curvature) and wire radius. The results presented are obtained using a thin-wire, time-domain (TWTD) computer model for Gaussian-pulse excitation. Some results for a straight wire are also presented for comparison. Representative analytical estimates for the curvature and wire-radius effects are developed from best-fits expressions to the computed results.

THE DEPENDENCE OF TIME-DOMAIN RADIATION LOSS ON THE CIRCUMFERENCE AND WIRE RADIUS OF A CIRCULAR LOOP ANTENNA