Response of a dielectric sphere for electromagnetic pulsed wave—cases of back- and forward-scattering


  • Akira Itoh,

    1. Tokyo National College of Technology, Hachioji, Japan 193
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    • Akira Itoh graduated from the Department of Electrical Engineering, Nihon University, in 1977 and received his M.S. degree in 1979. He received his Ph.D. degree later. In 1979, he became a Research Associate at Tokyo National College of Technology where he was promoted to an Assistant Professor in 1986 and to an Associate Professor in 1994. He has been engaged in research on the scattering transient phenomena of electromagnetic waves.

  • Toshio Hosono

    1. College of Science and Technology, Nihon University, Tokyo, Japan 101
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    • Toshio Hosono graduated in 1943 from the Department of Electrical Engineering, Nihon University, and his Ph.D. degree from the University of Tokyo in 1946. In 1960, he became a Professor at Nihon University. Since 1992, he has been Professor Emeritus of Nihon University. He was a Visiting Scholar at the University of Illinois, a Visiting Professor of Kuwait University, Chairman of Group on Electromagnetic Theory of Institute of Electrical Engineers of Japan, and Editorial Advisor for I.E.I.C.E. In 1978, he received a Best Paper Award from the Institute of Electrical Engineers of Japan. He is the author of Foundations for Information Engineering (Corona Publ.), Foundations for Linear Black Boxes (Corona Publ.), High-Speed Laplace Transform by BASIC (Kyoritsu Publ.), and a chapter in Modern Analysis Methods for Electromagnetic Fields (I.E.I.C.E.). He is an IEEE Fellow.


It is important to analyze the scattering phenomena of a dielectric sphere in conjunction with the improvement of performance of weather radar to observe rain clouds. This paper considers the transient scattering phenomena when a plane electromagnetic pulse wave is incident on a dielectric sphere. Specifically, the responses of the back- and forward-scattering observed at distant points are presented. The response waveforms are compared when the permittivity, loss, and incident waveform are varied. Analyzing the typical response waveforms, the propagation paths were estimated from the characteristics of the response time and waveform so that the scattering phenomena were studied. The fast inversion of Laplace transform (FILT) method was used for the calculation of the transient responses.