DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
EFFECTIVE LENGTHS OF ANTENNAS IN MAGNETOIONIC MEDIA.
NAVAL RESEARCH LAB WASHINGTON D C
The voltages induced in dipoles and loop antennas immersed in a magneto-active plasma are calculated using the Rayleigh-Carson theorem for magneto-active media as derived in NRL Report AD-610 009. The voltage induced is given in terms of an effective length times the applied electric field, and in the present case the tensor dielectric character of the magneto-ionic medium complicates the effective length calculations. A first approximation for the effective length of a linear dipole in a magnetoactive plasma is derived which can be used if the antenna is short. Because loop antennas are also used in ionospheric propagation experiments, the ratio of the voltage induced in a small loop antenna to that induced in a dipole antenna is derived. Author