Doug Miron <dmiron_at_stcloudstate.edu> wrote:
>
> An antenna is a one-port. To have two ports, as usually assumed in
> a Y-parameter description, you need two antennas. With two
> antennas, you could apply two voltage sources, one to each, and do
> the usual textbook experiments of driving one port and measuring
> (calculating) the currents in both ports to get two terms, and then
> driving the other port and finding the currents to get the other two
> terms, and the coupling y12=y21 should be the same.
Be careful about setting a NEC voltage source to zero. If you input
exactly zero volts, NEC will change this to Real part = 1.0, Im part =
0.0. So input 1.E-6 volts (for example) when you want zero.
-Chuck W1HIS (who learned this the hard way)
Received on Mon Feb 28 2000 - 05:12:34 EST
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