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Brent Regan wrote:
There was a very interesting demo at the RAMI both at OSH. The demo consisted of a standard, belly mounted, COM antenna on a pole, and connected to an analyzer. The point of the demo was to show the difference in VSR (a measure of an antennas efficiency, lower numbers are good with 1.0 being as good as it can get)
Brent,
I'm sorry, but you have to be careful about making this statement. The only thing that a low VSWR guarantees is maximum power transfer from the source if it’s impedance is that of the VSWR measuring device. It absolutely does not guarantee radiation efficiency. It is that in most circumstances with similar style antennas, the radiation efficiency of the antenna is similar, therefore more power in is more power radiated.
Without doing antenna range type measurements, I am concerned with using carbon fiber as your ground plane. There is the real possibility that you can get a match to the cable, and dissipate a significant amount of RF in the resistive carbon. You could have good VSWR, but lowered radiation efficiency. This would also translate to a lower receiving antenna efficiency too.
Charles R. Patton
LNC2 360JM
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