VLF input impedance of a loop antenna embedded in the magnetosphere |
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Authors: | TNC Wang CD Chang |
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Institution: | Radio Physics Laboratory, Stanford Research Institute, Menlo Park, California, U.S.A.;Department of Electrical Engineering, National Cheng-Kung University Tainan, Taiwan, Republic of China |
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Abstract: | An analysis is made to calculate input impedance of a loop antenna for radiation of the VLF whistler mode in the magnetosphere. The magnetosphere is assumed to be represented by a cold, uniform and collisionless magnetoplasma medium. Assuming a uniform current distribution of a circular loop, oriented at an arbitrary angle with respect to the Earth's magnetic field line, several closed-form expressions for the loop impedance have been derived. It is found that the loop input reactance is in substantial agreement with the self-inductance of a loop in free space and that the radiation resistance for a small loop can be as large as ~10 2 Ω. It is also found that a second order quasi-static theory is quite valid for determining the input impedance for small loops radiating VLF whistlers in the magnetosphere. |
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