Moxon Rectangles and Online CalculatorL. B. Cebik, W4RNL |
Online Moxon Calculator: Above is a version of the Moxon dimension calculator that you may use right on this page, thanks to Joe Faber, KG4UHP, who created the JAVAScript and gave me permission to place it here. Remember that the dimensions apply to Moxon rectangles that use the same diameter material throughout. Decide on the design frequency and the diameter of the elements. You may use inches or millimeters for the diameter--or you may select an AWG wire gauge. Be certain to select the unit of measure for the output. Then, click on any of the output boxes if the calculations have not already appeared.
2024 Update: Added 93 ohm option used in Simplifying the Turnstile Moxon Rectangle Fixed-Position Satellite Antennas, removed dependence on body tag.
MOXGEN: A stand-alone Windows program that calculates the dimensions of a Moxon rectangle for a near-50-Ohm feedpoint impedance, as described in "Designing Moxon Rectangles by Equation and by Model," has been developed by Dan Maguire, AC6LA. You may obtain a free copy from his website: www.ac6la.com/moxgen1.html. The program will also create a model in .EZ format for use with EZNEC or in .NEC format for use with NEC-Win software or with generic NEC programs. The only required input entries are the design frequency and the diameter of the wire or tubing to be used. Dan's site also contains a number of other very useful programs for modelers and others interested in antenna design and analysis.
The Moxon Rectangle is growing in popularity as a compact 2-element array that approaches a full-size 2-element Yagi in gain but with a far superior front-to-back ratio and a direct match for the standard 50-Ohm coaxial cable. The antenna can be built as a wire array--especialy for the lower HF regions--or as a rotateable aluminum beam. For convenience, I have pulled together the growing selection of Moxon Rectangle notes into this single subdirectory and organized them in the order of recommended reading--unless you already know what you are looking for.
Additonal information on building wire and tubing versions of Moxon rectangles for a direct 50-Ohm feed is available in Simple and Fun Antennas for Hams, ed. Hutchinson and Straw (ARRL, 2002), pp. 12-19 to 12-28.
The KD6WD Moxon Antenna Project is another good source of information on various construction techniques, especially for the operator needing a light-weight or a semi-stealthy antenna.
Moxon Rectangle Notes is also available in PDF book format with model sets on the Books Page.
Updated 07-04-2006. © L. B. Cebik, W4RNL. Data may be used for personal purposes, but may not be reproduced for publication in print or any other medium without permission of the author.