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CURTAIN_QAUD_2C_9.5DBI_OVAL_2450.NEC
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CURTAIN_QAUD_2C_9.5DBI_OVAL_2450.NEC
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CM Compact and easy to build 7.5 dbi omnidirectional antenna with wide bandwidth.
CM If we have 1.5 size antenna but connect only bottom half of it to a transmitter we get 8.73 dbi of gain.
CM If we have double size antenna but connect only bottom half of it to a transmitter we get 9.45 dbi of gain.
CM This design have very wide bandwidth due to thicker wire used.
CM
CM 1extra element 2 extra elements 3 extra elements
CM Gap Single size 1.5 size Double size
CM VG Gain SWR Gain SWR Gain SWR
CM
CM 0.75 7.72 1.30 6.45 1.55 6.45 1.59
CM 0.80 7.87 1.20 7.76 1.41 7.59 1.44
CM 0.85 7.97 1.10 8.48 1.31 8.69 1.30
CM 0.90 8.04 1.04 8.73 1.20 9.29 1.17
CM 0.95 8.07 1.07 8.73 1.06 9.45 1.01
CM 1.00 8.06 1.13 8.60 1.18 9.29 1.20
CM 1.05 8.03 1.16 8.34 1.49 8.93 1.48
CM 1.10 8.00 1.18 7.99 1.91 8.38 1.87
CM
CM freq=2450 Resonent frequency.
CM AH=3 Antenna height in wavelengths.
CM W=0.002 Wire Thickness. 0.004 0.002 to 0.008
CM C=0.0772 Center element. 0.0772
CM H=C/0.15 Horizontal elements. 0.5016 or C/0.15
CM V=C Vertical elements. 0.07386
CM HG=C Horizontal gap between 2 elements. 0.07386
CM elements=1 Number of elements (1 to 7). This decides size of antenna, peak gain and thereby beamwidth.VSWR does not change drasticly beween 1 to 7 elements.
CM VG=1.10 Vertical gap between 2 elements. 1.00 (peak gain is between 0.90 to 1.0). This parameter is very useful to tune the antenna.It adjust the VSWR, Range is 0.70 to 1.10. If RA is not 0 then range could be 0.20 to 1.00.
CM RA=0 Rotate angle between 2 elements 0-90 90 degrees rotation on Z axis have perfect omnidirectional pattern, 0 degrees rotation have oval pattern. Anything in beetween produce semi circular patern.
CM STUB1=0.98 Adjust stub lenght to adjuset VSWR 0.98 Electric length of stub
CM STUB2=0.98 Adjust stub lenght to adjuset VSWR 0.98 Electric length of stub
CM FP=0.18 Feedpoint 0.18
CE
SY freq=2450 'Resonent frequency.
SY AH=3 'Antenna height in wavelengths.
SY W=0.0020 'Wire Thickness. 0.0020 0.002 to 0.008
SY C=0.080715 'Center element. 0.080715
SY H=C/0.15 'Horizontal elements. 0.5381 or C/0.15
SY V=C 'Vertical elements. 0.079
SY HG=C 'Horizontal gap between 2 elements. 0.079
SY elements=1 'Number of elements (1 to 7). This decides size of antenna, peak gain and thereby beamwidth.VSWR does not change drasticly beween 1 to 7 elements.
SY VG=1.841379 'Vertical gap between 2 elements. 1.8414 (peak gain is between 0.90 to 1.85). This parameter is very useful to tune the antenna.It adjust the VSWR, Range is 0.70 to 1.10. If RA is not 0 then range could be 0.20 to 1.00.
SY RA=0 'Rotate angle between 2 elements 0-90 90 degrees rotation on Z axis have perfect omnidirectional pattern, 0 degrees rotation have oval pattern. Anything in beetween produce semi circular patern.
SY STUB1=3.3136 'Adjust stub lenght to adjuset VSWR 3.3136 Electric length of stub
GW 1 5 0 -C 0 0 C 0 W 'Center wire.
GW 2 11 0 C V+HG 0 H+C V+HG W
GW 3 11 0 C -V-HG 0 H+C -V-HG W
GW 4 13 0 C V+HG 0 C 0 W
GW 5 13 0 C 0 0 C -V-HG W
GW 6 11 0 -C V 0 -H-C V W
GW 7 11 0 -C -V 0 -H-C -V W
GW 8 13 0 -C V 0 -C 0 W
GW 9 13 0 -C 0 0 -C -V W
GM 10 elements 0 RA 0 0 VG 0
GM 0 0 90 180 0 0 0 AH
GS 0 0 299.80/freq
GE 0
LD 5 0 0 0 58000000
GN -1
EK
EX 0 1 3 0 1 0 0
TL 11 3 1 3 50 STUB1 0 0 0 0
FR 0 0 0 0 freq 0
EN