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  Topic: Challenge to validity of aperture theory & conductors
Riaan

Replies: 2
Views: 11929

PostForum: Questions Related to Antenna Theory   Posted: Thu Jul 21, 2016 7:27 pm   Subject: Radiation from arbitrarily shaped aperture antennas
Dear fellow members,

When I last posted about this topic on this forum (I was truly shocked to see that it was almost 6 years ago), I had in the back of my mind that should I one day succeed in hav ...
  Topic: Challenge to validity of aperture theory & conductors
Riaan

Replies: 2
Views: 11929

PostForum: Questions Related to Antenna Theory   Posted: Tue Sep 29, 2015 7:36 pm   Subject: Challenge to validity of aperture theory & conductors
I recently decided to submit a follow-on article on the use of the equivalence principle in aperture problems. I had come to the conclusion that the conventional technique, in which a conductor is pla ...
  Topic: Challenge to validity of aperture theory & conductors
Riaan

Replies: 2
Views: 11929

PostForum: Questions Related to Antenna Theory   Posted: Thu Aug 21, 2014 7:53 pm   Subject: Challenge to validity of aperture theory & conductors
Dear all,

Some years ago I published a paper in which I pointed out that the concept of placing a conductor in the null field of an aperture antenna problem is invalid. This paper has, however, be ...
  Topic: Why does a spiral radiate at a circumference of one lambda?
Riaan

Replies: 1
Views: 9541

PostForum: Questions Related to Antenna Theory   Posted: Sat Oct 23, 2010 6:34 am   Subject: Why does a spiral radiate at a circumference of one lambda?
Has anyone been able to quantitively or mathematically show why a spiral antenna radiates in the region where the circumference equals one wavelength? We know that from experimental results and numeri ...
  Topic: Spiral antenna axial ratio at 90 degrees - not infinite!
Riaan

Replies: 0
Views: 9159

PostForum: Questions Related to Antenna Theory   Posted: Fri Oct 22, 2010 2:34 pm   Subject: Spiral antenna axial ratio at 90 degrees - not infinite!
Practical spiral antennas have very good (e.g. 3 or 4 dB) wideband axial ratio (AR) out to 90 degrees off boresight. Numerical analysis however almost invariably predicts an infinite AR at 90 degrees. ...
 
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