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《Journal of Changchun University of Science and Technology》 2004-01
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Analysis of the input characteristics of electrically short antenna in the subsurface

SUN Jian-guo~(1,2), KANG Guo-jun~(1,2), ZHANG Hui~(1,2) (1.College of Geo-Exploration Science and Technology, Jilin University, Changchun130026, China;2.Laboratory for Integrated Geophysical Interpretation Theory of Ministry for Land and Resources,Changchun130026, China)  
The input admittance of electrically short antenna located in the subsurface is a function of its geometrical size, the operating frequency, and the electrical parameters of the geological materials near and under the surface. By analyzing the function numerically, it is found that (1) the input admittance of electrically short antenna is a complicated function of the operating frequency. When the frequency is relative low, the driven point conductance does not change significantly with the change of the dielectric constant, while the driven point susceptance changes linearly with the frequency. (2) For low frequencies, the dielectric constant has no significant influence on the driven point susceptance, and there exists a frequency band in that different dielectric constants give the same driven point susceptance. (3) The driven point admittance is sensitive to the change of frequency in the region with low resistivity. For media with middle and high resistivities, the driven point admittance has the same value independent of the frequency. (4) The driven point admittance of electrically short antenna increases when the antenna has a larger radius and length.
【Fund】: 国家自然科学基金资助项目(40074029)
【CateGory Index】: P631.3
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