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miner_tom
Antenna-Theory.com Newbie

Joined: 09 May 2018
Posts: 2

 Posted: Wed May 09, 2018 5:41 pm    Post subject: Need magnetic loop antenna theory references. Hi to the forum, I have several books concerning antenna theory but they mostly deal with electric dipoles. I have not seen much theory concerning the operation of what are referred to "magnetic" loop antennas. Please recommend references. Thank You Tom Ke6EXT

Joined: 03 Jan 2007
Posts: 204

 Posted: Thu May 10, 2018 11:27 pm    Post subject: What specifically are you looking for? Magnetic dipoles are typically loop antenna that are much smaller than a wavelength. They are inefficient and horizontally polarized. Basically their fields are similar to a short dipole, with the polarization swapped and near fields that are more strongly H- than E-. Hence they look like small dipoles with E- and H- swapped. They have low gain, low directivity, and the pattern looks similar to a diploe antenna. There are a lot of complicated equations (just look up the ones for short dipole) and you'll get an idea.
miner_tom
Antenna-Theory.com Newbie

Joined: 09 May 2018
Posts: 2

 Posted: Fri May 11, 2018 9:52 pm    Post subject: Thank you for the reply Your reply was short and of a general nature but that is what I was looking for to start off with. Now I can dig though all of the math but with a perspective on what was important to me. Regards Tom
R. Fry
Antenna Theory Regular

Joined: 06 Jun 2011
Posts: 46
Location: Illinois USA

 Posted: Tue May 22, 2018 10:27 am    Post subject: Just to note that the electric and magnetic radiation existing in the far field of a transmit antenna always have the same relationship to each other -- regardless of the antenna configuration that produced them (e.g., dipole or loop).
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