a question a bout antennas.

cause English is not my mother language, I can not understand what is the difference between a "loop antenna" and a "toroidal entenna" .
would you be so kind to explain it for me ?

Thanks .

This is a very specialized antenna. http://www.hep.princeton.edu/~mcdona...ples/cwhta.pdf is a scientific paper on the subject.

Thanks for replying :)
is the antenna mentioned in the paper a toroidal
antenna ?here are 3 types of antennas now

loop antenna, toroidal antenna and helical toroidal antenna .