VLF input impedance of a loop antenna embedded in the magnetosphere

Details VLF input impedance of a loop antenna embedded in the magnetosphere VLF input impedance of a loop antenna embedded in the magnetosphere

Oct 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.1810w&link_type=abstract

Planetary and Space Science, Volume 21, Issue 10, p. 1810-1815.

Physics

Scientific paper

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 ~102 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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