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   Compute the number of elements needed to prevent grating lobes.
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   Form:
   n = NElementsPhasedArray( w, h, f, theta )
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   ------
   Inputs
   ------
   w             (1,1)    Width (m)
   h             (1,1)    Height (m)
   f             (1,1)    Frequency (GHz)
   theta         (1,1)    Max scan angle (deg)

   -------
   Outputs
   -------
   n             (1,1)    Number of elements

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