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CURTAIN_QAUD_2C_8dbi_OVAL_5785.NEC
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CURTAIN_QAUD_2C_8dbi_OVAL_5785.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 7.34 1.85 6.45 1.55 6.45 1.59
CM 0.80 7.43 1.63 7.76 1.41 7.59 1.44
CM 0.85 7.50 1.48 8.48 1.31 8.69 1.30
CM 0.90 7.52 1.34 8.73 1.20 9.29 1.17
CM 0.95 7.52 1.16 8.73 1.06 9.45 1.01
CM 1.00 7.50 1.05 8.60 1.18 9.29 1.20
CM 1.05 7.47 1.33 8.34 1.49 8.93 1.48
CM 1.10 7.44 1.75 7.99 1.91 8.38 1.87
CM
CM W=0.008 Wire Thickness. 0.008
CM CW=0.0045 Center element wire thickness 0.0045
CM C=0.0739 Center element. 0.0739
CM H=0.50 Horizontal elements. 0.5037
CM V=C Vertical elements. 0.075
CM elements=3 Number of elements (1 to 4). This decides size of antenna, peak gain and thereby beamwidth.VSWR does not change drasticly beween 1 to 4 elements.
CM HG=C Horizontal gap between 2 elements. 0.075
CM VG=1.10 Vertical gap between 2 elements. 1.00 (best peak gain is between 0.90 to 1.0). This parameter is very critical but very useful to tune the antenna.It adjust the VSWR, peak gain.Range is 0.75 to 1.10.
CM FP=0.18 Feedpoint 0.18
CE
SY freq=5785 'Resonent frequency.
SY W=0.002 'Wire Thickness. 0.004 0.002 to 0.008
SY C=0.073866 'Center element. 0.07386
SY H=0.501608 'Horizontal elements. 0.5016
SY V=C 'Vertical elements. 0.07386
SY HG=C 'Horizontal gap between 2 elements. 0.07386
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=0.96 '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.
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=0.961054 'Adjust stub lenght to adjuset VSWR 0.98 Electric length of stub
SY STUB2=1.00645 'Adjust stub lenght to adjuset VSWR 0.98 Electric length of stub
SY FP=0.18 'Feedpoint 0.18
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
GW 100 1 FP VG/2 -W FP VG/2 W W
GS 0 0 299.8/freq
GE 0
LD 5 0 0 0 58000000
GN -1
EK
EX 0 100 1 0 1 0 0
TL 100 1 1 3 50 STUB1 0 0 0 0
TL 100 1 11 3 50 STUB2 0 0 0 0
FR 0 0 0 0 freq 0
EN