FREE Access to article.
After a discussion with the antenneX publisher, he has published my article in the FREE access section.
http://download.antennex.com/listarch/files/searchlight.pdf
A couple of comments re recent questions.
Re efficiency: For ME, an inefficient antenna is BAD. So, if the Searchlight proves to be inefficient, then I'm disappointed. HOWEVER, in some applications, an inefficient antenna that can be used on "any" frequency with minimum or no tuning is/may be "good." An example is a resistively loaded device like the B&W. Crummy ham antenna, but they have sold lots of them for "other" applicatios.
Yes, the Searchlight can be viewed as an assymetric dipole. But an assymetric dipole MUST be fed in the center. And that is not practical in *most* vertical installations.
Also similar to some of the open sleeve designs I have seen. These devices are about 50% larger than Searchlight, since they are -- in effect -- J poles with the J morphed into a cylinder.
Searchlight is NOT the same as a coaxial sleeve antenna since the RF at the bottom of the sleeve is at a VERY high RF potential. And THAT makes it*very* difficult to control common mode currentsm in the feeder.
All the best,
Bill
