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Progress In Electromagnetics Research M | ISSN: 1937-8726 |

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## THE DEPENDENCE OF TIME-DOMAIN RADIATION LOSS ON THE CIRCUMFERENCE AND WIRE RADIUS OF A CIRCULAR LOOP ANTENNABy E. K. Miller
Abstract:
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 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. Analytical estimates for the curvature and wire-radius effects are developed from best-fits expressions to the computed results.
2. Jackson, J. D., 3. Shen, L.-C., T. T. Wu, and R. W. King, "A simple formula of current in dipole antennas," 4. Anderson, B., "Admittance of infinite and finite cylindrical metallic antenna," 5. Jones, D. S., 6. Miller, E. K., "The proportionality between charge acceleration and radiation from a generic wire object," 7. Landt, J. A., E. K. Miller, and M. Van Blaricum, "WT-MBA/LLL1B (TWTD): A computer program for the time-domain electromagnetic response of thin-wire structures,", Lawrence Livermore Laboratory, Report No. UCRL-51585, 1974. 8. Miller, E. K., A. J. Poggio, and G. J. Burke, "An integro-differential equation technique for the time-domain analysis of thin-wire structures, Part I: The numerical method," 9. Poggio, A. J., E. K. Miller, and G. J. Burke, "An integro-differential equation technique for the time-domain analysis of thin-wire structures. Part II: Numerical results," 10. Paul, C. R., "Partial Inductance," 11. Miller, E. K., "Time-domain computation of loop inductance," |

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