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Quite a few years ago, there were a couple of articles -- in Ham Radio
magazine, I believe --, which addressed that topic. As I recall, the author used an optimization program that allowed the shape to vary. He ended up with elements bent kind of like a gull wing, and considerably longer than a half wavelength -- more like a wavelength if I recall correctly. The gain was substantially more than for a Yagi, but I don't remember how good the F/B ratio was. I believe he did construct and measure some actual antennas. I'm sorry I don't recall the name of either the author or the articles. Hopefully, though, this posting will spur someone with a better memory (and that includes just about everyone) to recall and report enough information for you to find the articles. The articles were very interesting, but it looked to me like the construction problems would outweigh the benefits. Apparently I'm not the only one to reach that conclusion, because in the intervening years I've never seen an actual antenna resembling that design. Roy Lewallen, W7EL Dan Jacobson wrote: Just curious, what is the result of computer modeling for the ideal shape of Yagi elements? I couldn't just be simple tubes. |
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