Title :
Wait´s complex-image principle generalized to arbitrary sources
Author :
Lindell, Ismo V. ; Hänninen, Jari J. ; Pirjola, Risto
Author_Institution :
Electromagn. Lab., Helsinki Univ. of Technol., Espoo, Finland
fDate :
10/1/2000 12:00:00 AM
Abstract :
The well-known simple and remarkably accurate approximate low-frequency (LF) complex-image method introduced in 1969 by J. R. Wait to compute the effect of the ground to the field of a divergenceless horizontal current (vertical magnetic current) is generalized to arbitrary current sources through the exact image formulation. The images of a vertical dipole, a horizontal current segment, and an oscillating point charge are first reduced to simplified but asymptotically exact forms and, subsequently, in terms of delta and step-functions to approximate image expressions that also include Wait´s image. The novel part of the image is tested numerically through a geophysical example
Keywords :
approximation theory; conducting bodies; electric current; geophysical techniques; radiowave propagation; LF complex-image method; LF radio propagation; Wait´s complex-image principle; arbitrary current sources; delta functions; divergenceless horizontal current; exact image formulation; geophysics; horizontal current segment; image expressions; low-frequency complex-image method; oscillating point charge; perfectly electrically conducting plane; vertical dipole; vertical magnetic current; Conductivity; Earth; Electromagnetic radiation; Frequency; Geophysics computing; Image segmentation; Impedance; Nonhomogeneous media; Radio propagation; Testing;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
