Title :
Characteristic of the scattering field from a lossy medium coated conducting sphere
Author :
Zhang Liyang ; Wang Wenbing
Author_Institution :
Xi´´an Jiaotong Univ., China
Abstract :
The characteristics of the scattering field from a lossy medium coated perfectly conducting sphere are studied analytically. Singularities of the scattering field are only poles. There are no branch point contributions to transient electromagnetic scattering responses. The natural frequencies of the scatterer are numerically evaluated. It can be seen that the poles shift regularly under variations of conductivity of the coating medium sigma /sub 1/. Large sigma /sub 1/ introduces extra poles on the imaginary axis of the complex frequency plane. Branch points of square root epsilon do not give rise to extra poles.<>
Keywords :
coatings; electromagnetic field theory; electromagnetic wave scattering; coated conducting sphere; coating medium; complex frequency plane; conductivity; lossy medium; natural frequencies; poles; scattering field; singularities; transient EM scattering responses; Coatings; Conductivity; Electromagnetic scattering; Electromagnetic transients; Equations; Frequency; Numerical analysis; Partial response channels; Tellurium; Transient response;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115281
