Hi Leila,
I guess that with EM coils as that used in transcranial magnetic stimulation, for example. I attach you the wiki ref.
Regards,
https://en.wikipedia.org/wiki/Transcranial_magnetic_stimulation
Leila,
it´in the coil design, as indicated by the other responses. There is no single and sinple answer, but many consideration to make. I suggest that you check the work by Shogo Uen, who over the years has published sevral ground-breaking papers on coild for e.g. TMS etc.
Two recent and relevant refrences are:
Lu M, Ueno S.Calculating the induced electromagnetic fields in real human head by deep transcranial magnetic stimulation. Conf Proc IEEE Eng Med Biol Soc. 2013;2013:795-8. doi: 10.1109/EMBC.2013.6609620.
Tsuyama S, Hyodo A, Sekino M, Hayami T, Ueno S, Iramina K.The numeric calculation of eddy current distributions in transcranial magnetic stimulation. Conf Proc IEEE Eng Med Biol Soc. 2008;2008:4286-9. doi: 10.1109/IEMBS.2008.4650157.
Good luck!
/Mats
Hello to all
Thank you for your excellent responses.
I am interested in ELF-MF's therapeutic effects.
Regards,
Selection of these types of antennas are according to the frequency of operation.
At frequencies below 3GHz, you can employ yagi-uda antennas.
At higher frequencies above 3GHz, you can use Horn antennas, lens antennas, parabolic dishes.
In the near field you're talking about Lenses - dielectric or Fresnel for instance. The Lens effect can be achieved by antenna arrays too.
Since you're talking about biomedical applications, the frequency comes into play, for lower frequencies the focusing system may be too large and cumbersome.
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