Moxon is a rectangle shaped directional antenna, originally designed by Les Moxon (G6XN). There are couple of advantages of using this antenna.
- It is small in size
- Easy to mast
- Balanced to 50 Ohms
- Near 1:1 SWR
- Excellent Front to Back (F/B) ratio
- Large bandwidth
- Large beam-width angle
Here I have given the measurements of a 2m band, centered on 145.2MHz moxon antenna. The calculation is found by Moxgen software. The software can be downloaded from this website.
According to NEC calculation the Far Field Radiation Pattern is presented below. As we can see it shows approximately 6 dBi gain which is comparable to a 2m band 3 elements Yagi. It’s beam-width is 80 degree which is quite large and will give freedom to communicate with a lot of stations in the desired direction. It’s F/B ratio is around 43 dB and almost no back lobes. All the signal is concentrated in the forward direction.
As we run the SWR sweep from 144 to 146MHz range, it shows a fantastic SWR at the center frequency. SWR doesn’t get too high even we go far from the center. It definitely covers the full amateur band with healthy SWR value.