The images that follow show the near field Z as a measure of mismatch to 377 Ohms of free space. The coloring shows the contours of SWR averaged through the depth of a half wavelength sided cube. The degree of mismatch has been limited to display the values of 1:3:1 SWR. In other words, Z values outside the range of roughly 120 Ohms to 1200 Ohms are clipped so that extreme values did not drive the graphics presentation. The Blue coloring below corresponds to a SWR of 1.25.
download the mathcad file used to generate the images.
download the eznec file used to generate the data.
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