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Antennas led astray
Tho the Yagi has been good to communication over
the years it has in fact retarded the advance of antennas. The biggest reason is the misinterpretation of the term "curl" where it is termed as a two dimensional vector instead of a three dimensional vector. The two dimensional term came about by adding vectors to a static charge where the vector values are zero i.e time was removed from equations by reducing the vector to a point for the sake of mathematical expedience but with a known direction. This aproach has fastened into the minds of academics that radiating elements should always be in parallel form and which the Yagi has perpetuated. The error in this aproach is that when a time varying field is applied to a static charge is that the addition of vectors move from a two dimensional form into a cartesian three dimensional form. With this concept in mind which is an extension of a Gaussian antenna aproach, it should be seen that parallism tho good in terms of manufacture is not the ideal array arrangement and in fact verticals may well be better off place at an angle somewhat less than 90 degrees. Ofcourse as always antennas are compromises and the biggest drawback here is the lack of symetry for only a small advance in efficiency. Food for thougtht gentlemen if you have an open mind Art |
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