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I have written a deck for NEC2 which uses and incident plane wave as the excitation scenario. The deck: CMSmall square untuned loop CMEXTENDED THIN WIRE KERNEL USED CM1. FREE SPACE CE2. Plane wave excitation GW 1 9 -0.25 0 1 -0.25 0 1.5 .0007 GW 2 9 -0.25 0 1.5 +0.25 0 1.5 .0007 GW 3 9 +0.25 0 1.5 +0.25 0 1 .0007 GW 4 9 +0.25 0 1 -0.25 0 1 .0007 GE 1 EK FR 0 1 0 0 7.1 EX 1 1 1 0 90 0 0 0 0 0 LD 4 1 1 1 50 0 GN -1 XQ EN I get an antenna factor of 35.8dB/m by multiplying the current in wire 1, seg 1 (the location of the 50 ohm load) by 50 ohms, and taking -20*log of that voltage. Owen PS: This won't work if you are working with one of the original column formatted Fortran inputs, but it does work with nec2++ ( http://www.si-list.org/NEC_Archives/swindex.html ) |
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