Elementary Loop Antenna

A small loop of current S, producing a vector potential approximated as:

$$ A \approx j \frac{\mu}{4\pi} I k \frac{e^{-jkr}}{r} \sin\theta S $$

Standing Wave Antennas

Antennas where the current distribution follows a standing wave pattern, given by:

$$ I(l) = I_m \sin(k(h - |l|)) $$