Wave Number and Input Impedance of a VLF Insulated Linear Antenna in an Anisotropic Ionosphere

被引：0

作者：

Zhang, Shitian ^{[1
,2
]}

Peng, Huaiyun ^{[2
]}

Wei, Bing ^{[1
]}

Han, Xiange ^{[1
]}

Wang, Maoyan ^{[3
]}

机构：

[1] School of Physics and Optoelectronic Engineering, Xidian University, Xi’an, China

[2] National Key Laboratory of Electromagnetic Environment, Qingdao, China

[3] School of Physics, University of Electronic Science and Technology of China, Chengdu, China

来源：

International Journal of Antennas and Propagation | 2021年 / 2021卷

基金：

中国国家自然科学基金;

关键词：

Anisotropy - Geomagnetism - Electric impedance measurement - Ionosphere - Electric impedance - Electromagnetic fields - Ionospheric measurement - Wave equations - Antennas;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

We report a method to obtain the wave number and input impedance of a very low frequency (VLF) insulated linear antenna in an anisotropic ionosphere. Due to the anisotropy, electromagnetic fields in the ionosphere are decomposed into the ordinary wave and extraordinary wave. Wave equations for the layered structure are applied to access the wave number of the insulated antenna in the ionosphere via the derivation of the eigenvalue equation by using boundary conditions. The expression for the wave number is given based on some approximation formulas. Then, King’s antenna theory is further employed to solve the input impedance and current distribution of the antenna in the anisotropic medium. After the validation of the method is performed, near-field characteristics for an insulated antenna with different medium parameters in the anisotropic ionosphere are discussed. Effects of the electric density and geomagnetic field of the time-and space-varying anisotropic ionosphere on the distribution of normalized current are analyzed. This finding provides a promising avenue for getting electromagnetic characteristics of spaceborne antennas. Copyright © 2021 Shitian Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

引用