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8133Re: [loopantennas] Re: Loop reflector

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  • Dale Parfitt
    Jan 5, 2011
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      You cannot think of it as 4 1/4 wave dipoles as there are only 2 current loops.
      Model the antenna with any of the popular software ad we can end this disagreement.
      The models converge very nicely and do not disobey any of the miniNEC limitations.
      Dale W4OP

      ----- Original Message -----
      From: Andy
      To: loopantennas@yahoogroups.com
      Sent: Wednesday, January 05, 2011 6:23 PM
      Subject: Re: [loopantennas] Re: Loop reflector



      > ... Think of a 1 wavelength
      > horizontal loop as two half wave dipoles spaced 1/4 wavelength apart- it is
      > obvious this is not omni and will have classic construction and destruction
      > azimuth pattern.

      OK ... but now think of it as four shortened (quarter wave) dipoles in a square.

      Now it's not so obvious that it might have classic dipole radiation
      characteristics.

      Thinking that a loop is like two dipoles in parallel, is a real stretch.

      And in fact a good 1 wavelength loop radiates nothing like a dipole!

      Bend a circular loop into a square or triangle, and it's not quite so
      omni anymore; but it's still close enough for government work.

      Andy





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