multidips.nec

zip contains tool for Antenna Modelling with examples

' Example multiband antenne: First created with Geometry editor (with SYmbols),
' then modified using 'Notepad' to get more 'readable' symbols/variables and 
' after this optimized on SWR for 3.6, 7.1 and 14.1 Mhz. 
' Generate with 'use original file' to see SWR for different bands. (takes a while)
CE
SY w1seg=37,w1x1=.5,w1y1=0,w1z1=20,w1len = 19.66177,w1rad=1.e-3
GW	2	w1seg	w1x1	w1y1	w1z1	w1len	w1y1	w1z1	w1rad
GW	3	w1seg	-w1x1	w1y1	w1z1	-w1len	w1y1	w1z1	w1rad
SY w2seg=19,w2z1=19.5,w2len = 10.26445
GW	4	w2seg	w1x1	w1y1	w2z1	w2len	w1y1	w2z1	w1rad
GW	5	w2seg	-w1x1	w1y1	w2z1	-w2len	w1y1	w2z1	w1rad
SY w3seg=9,w3z1=19,w3len = 5.173325 
GW	6	w3seg	w1x1	w1y1	w3z1	w3len	w1y1	w3z1	w1rad
GW	7	w3seg	-w1x1	w1y1	w3z1	-w3len	w1y1	w3z1	w1rad
SY w7seg=3
GW	8	w7seg	-w1x1	w1y1	w1z1	w1x1	w1y1	w1z1	w1rad
GW	9	w7seg	-w1x1	w1y1	w2z1	w1x1	w1y1	w2z1	w1rad
GW	10	w7seg	-w1x1	w1y1	w3z1	w1x1	w1y1	w3z1	w1rad
GE	0
GN	2	0	0	0	14	-.006	' Average ground
TL	8	2	9	2	450	0
TL	9	2	10	2	450	0
EX	0	10	2	0	1	0

SY Freq=3.6						' Design frequency				
FR	0	1	0	0	Freq
XQ
'
SY start=3.5, stop=14.5, step=.1				' Set Freq-sweep.
SY nrf=(stop-start)/step+1
FR 0 nrf 0 0 start step
EN