handiko / yagi-4e-144

4-elements Yagi Antenna for 144.3 MHz - 12.5 Ohm design. Meant to be fed using a gamma match.

4 Elements Yagi Antenna for 144.3 MHz

4-elements Yagi Antenna for 144.3 MHz - 12.5 Ohm design. Meant to be fed using a gamma match. This antenna won the Techno Antenna Fair 2014 - 2015 for Directional Antenna Category.

Properties

• Elements : 1 reflector + 1 driven element + 2 directors
• Boomlength : 1.5 m
• Material : Aluminium alloy tubes / rods
• Input impedance : 12.5 Ohm resistive nominal (use a gamma match to bring it to 50 Ohm)
• VSWR : better than 1:1.1 (when matched using a gamma match)
• Gain : better than 16 dBi (simulation, at least 3 meters above average ground, horizontal polarization)

Geometries

Element	Length,mm (full span)	diameter,mm	Position,mm
Reflector	1020	4	0
Drivent element	949	10	320
Director 1	942	4	860
Director 2	922	4	1480

Simulations

The simulation files are included in Yagi-4E-144/models/. The .nec file is created using 4NEC-2 and .maa file is created using MMANA-GAL

During Testing

Contributing

1. Fork it https://github.com/handiko/Yagi-4E-144/fork
2. Create new branch (git checkout -b add-blah-blah)
3. Do some editing / create new feature
4. Commit your works (git commit -m "Adding some blah blah blah..")
5. Push to the branch (git push -u origin add-blah-blah)
6. Create a new Pull Request