On input impedance of an arbitrarily oriented small loop antenna in a cold collisionless magnetoplasma

Closed-form expressions are derived for the input impedance
Z
of a small loop antenna with arbitrary orientation in a cold collisionless uniform multicomponent magnetoplasma. The closed-forms results of
Z
are compared with numerical results from a full-wave formal solution. It is found that for small loops these approximate formulas adequately represent the loop input impedance.