Revised August 2010 v1.0
I WILL MODEL THIS ANTENNA IN ANY TUBE SIZE OR TAPER SECHDULE FOR YOU, CONTACT ME VIA EMAIL
This is a high-gain, wideband OWA (Optimised Wideband Array) Yagi
which covers the whole of the 15m band with an SWR of less than1.1:1. It
has options with both UK/USA and European sized tube and has a 3
section taper.
This Antenna has been modelled
using NEC4 and confirmed by FEKO. This is thousands of dollar of the
very latest antenna design software available and the results are highly
accurate. When loading into your software, you will see similar SWR but
not the same. Please do not alter the model, build to these dimensions
for the best results.
Contact
me if you are unsure what correction (if any) you require for the
element holders/stand-offs you will use or any other questions you may
have.
Also read 'An intro to OWA Yagis' and 'Creating a Balun'
Antenna Layout and Construction:
Performance
11.89dBi @ 21.200MHz
23.86dB @ 21.20MHz
SWR: Below 1.1.1 from 21MHz to 21.450MHz
Construction details
Refer to the above drawing.
Antenna Dimensions for UK/USA sized tubing - European version below
Taper: Mid Section, 5/8 inch tube (total length 4.8m). Outer section 1/2 inch 2.4m long. End sections as per below schedule
Spacing End Section Length (All below sizes in Metres)
Reflector 0 1.201
DE1 2.064 1.133
D1 2.798 .964
D2 4.881 .948
D3 8.150 .879
D4 12.452 .820
D5 16.835 .666
Antenna Dimensions for European sized tubing
Taper: Mid Section, 16mm tube (total length 4.8m). Outer section 13mm tube 2.4m long. End sections as per below schedule
Spacing End Section Length (All below sizes in Metres)
Reflector 0 1.199
DE1 2.064 1.130
D1 2.798 .962
D2 4.881 .946
D3 8.150 .877
D4 12.452 .818
D5 16.835 .664
Polar Plots
Azimuth Plot of this super antenna
Elevation plot of this antenna
Elevation plot of this antenna at 15M above ground
SWR Plot
Any questions, please ask!
Justin G0KSC |