부산대학교 도서관

For full-fledged applications of radar imaging of burled objects by using electromagnetic waves, it is important to analyze theoretically and experimentally the fundamental problems such as the scattering of the electromagnetic wave by various objects and the electromagnetic wave propagation from the antenna above the ground Into the ground. As the first step toward such a goal, this paper studies the transient electromagnetic fields scattered by an infinite perfectly conducting circular cylinder placed near a dipole antenna in free space. First, the transient electromagnetic fields are calculated rigorously for the case where one dipole antenna is placed in parallel to a conducting cylinder. Furthermore, geometrical optics approximation also is derived. From the computed results, it is shown that the transient scattered field can be interpreted as the total sum of the scattered fields corresponding to optical paths. It is shown also that the geometrical optics approximation is extremely accurate in the backscattering region important for the analysis of inverse scattering problems such as the detection of a buried object. Next, the transient transmission and reception responses are analyzed theoretically in the case where two dipole antennas are placed in parallel to the circular cylinder and its validity is confirmed by experiments. [ABSTRACT FROM AUTHOR]