FDTD Analysis of Two-Dimensional Cavity-Backed Antenna for Subsurface Radar

Osamu MAESHIMA  Toru UNO  Yiwei HE  Saburo ADACHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.10   pp.1468-1473
Publication Date: 1993/10/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on the 1992 Symposium on Electromagnetic Theory)
Category: Transient Field
Keyword: 
FDTD method,  subsurface radar,  cavity-backed antenna,  radiowave absorber,  (FD)2 TD method,  

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Summary: 
The antennas for subsurface radar are usually covered with a conducting cavity to prevent the radiation field from affecting the electromagnetic environment and to protect the received field from external noises. Furthermore, radiowave absorber is attached to the interior wall of the cavity in order to suppress the multiple reflections in the cavity. In this paper, the characteristics of the two-dimensional cavity-backed antenna having the absorber and the over-all properties of this subsurface radar due to buried objects are numerically analyzed by the Finite-Difference Time-Domain method. It is shown that the pulse propagation in the ground is confined to the narrow region due to the cavity. It is also shown that the multiple reflections in the cavity are effectively suppressed by choosing the suitable absorber, and so that the distinctive pulse echo can be obtained.