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Need magnetic loop antenna theory references.

 
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miner_tom
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Joined: 09 May 2018
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PostPosted: Wed May 09, 2018 5:41 pm    Post subject: Need magnetic loop antenna theory references. Reply with quote

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
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admin
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Joined: 03 Jan 2007
Posts: 204

PostPosted: Thu May 10, 2018 11:27 pm    Post subject: Reply with quote

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.
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miner_tom
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Joined: 09 May 2018
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PostPosted: Fri May 11, 2018 9:52 pm    Post subject: Thank you for the reply Reply with quote

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
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R. Fry
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Joined: 06 Jun 2011
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Location: Illinois USA

PostPosted: Tue May 22, 2018 10:27 am    Post subject: Reply with quote

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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