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Hexbeam Antenna Modeling
Clifford,
There are two styles of hexbeam: the older design which has a W-shape Driver and a W-shape Reflector, and which I call the "classic" on my web site; and my newer broadband design which has a W-shape Driver and a U-shape Reflector. I found in my lab notebook a 2m version of the broadband style; its dimensions a half-Driver 21"; Reflector 40"; end gap 2.5". I think I assumed wire construction using #14 bare copper. That would give a hexagon radius of 12.5". When I model this with EZNEC I see about 3.8dBd Forward Gain and 19dB F/B with VSWR=1.4. The problem is that the rearward response is very smooth and "well behaved" so probably not much use for DF. If I increase the end gap to 5" the Forward Gain and F/B remain about the same, but the azimuth pattern devlops deep side nulls (38dB) at plus and minus 130 degrees which may be useful. The VSWR deteriorates to 1.8:1. Hopefully that may give you a starting point for experimentation. If I get a chance I'll try some modelling experiments on the classic design also. 73, Steve G3TXQ |
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