Small Transmitting Loops (STL) are loops of less than about 0.1λ in diameter or about 0.3λ in circumference. Below these limits, the current around the loop is almost uniform and this permits a simplified analysis. (A stricter definition of 0.3λ in circumference could be argued.)
These antennas are ascribed all sorts of magic properties, low noise, able to create band openings when conditions are poor etc. Continue reading The magic of small transmitting loops