MOXON antenna project
my current project is a 40 meter MOXON. why, because it is an interesting design plus I need a
40 meter antenna... that seems to be where i spend most of my time.
ADVANTAGES for me:
front to back > 30 db
gap with directive pattern (unique to MOXON)
the design of the MOXON started with Les Moxon G6XN (sk).
Les Moxon, G6XN originally designed the Moxon Rectangle based upon a design by Fred Caton, VK2ABQ.
L.B. Cebik, W4RNL optimized a wire version of the Moxon. The Moxon can be visualized as a 2-element
yagi with the element tips bent towards one another. The tips are separated by an insulator creating
a gap which is mostly responsible for the directive pattern unique to the Moxon.
The Moxon is a directional antenna system that is gaining in popularity because it offers three very distinct advantages over a typical two element Yagi:
Small in physical size. The Moxon can be built using a very lightweight structure and wire elements,
which will fit into a footprint about two thirds the area required for a conventional beam.
You can see by the measurements above that a 20 meter Moxon is only 25 by 9 feet.
Being a very light structure, typically made from wire and lightweight spreaders, it can easily be
mast mounted on a lightweight pole, hoisted up in a tree from an overhanging branch, or turned
vertically and ground mounted! As such it also makes an excellent field antenna.
Outstanding front to back ratio. The Moxon's front-to-back ratio models at greater than 30dB! Moreover,
close-gap coupling enables the Moxon's enhanced performance to be realized at lower elevation heights of only 1/2 wavelength.
As seen below, the Moxon exhibits a broad forward area combined with superior front to back.
The Moxon is a 50 ohm antenna, generating a near perfect 1:1 swr without requiring any additional matching devices.
It is also quite broadbanded allowing for effective full band coverage.
The Moxon antenna can provide hams with an excellent antenna system that is easy to homebrew and usually does not
require any adjustment if made according to the dimensions specified by software that is available on this website.
A typical Moxon rectangle can be built in a few hours, using X or H type of spreaders made from bamboo, fiberglass, pvc or a variety of other materials.