Moxon antenna
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The Moxon antenna or 'Moxon Rectangle' is a simple and mechanically robust two-element parasitic array, single-frequency antenna.[1] It takes its name from the amateur radio operator Les Moxon[2] (amateur radio call sign G6XN).[1]
Design
The design is rectangular, with slightly less than half of the rectangle being the driven element (radiator) and the other part (slightly more than half) being the reflector. It is electrically equivalent to a two element Yagi antenna with bent elements and without directors.
Because of the folded ends, the element lengths are approximately 70% of the equivalent dipole length. The two element design gives modest directivity (about 2.0 dB) with a null towards the rear of the antenna, yielding high realized front to back ratio. At 28 MHz antenna gain up to 9.7 dBi can be obtained.[3] Because the placement and size of the parasitic reflector are highly dependent on wavelenght, each Moxon antenna is built to operate on only one frequency
Moxon rectangles are often used by radio amateurs in portable forms and on field days because of their lightweight construction.
Practical Construction
The Moxon antenna is popular with amateur radio enthusiasts for its simplicity of construction. The drawing shows the system of construction. The driven element is at the left, and the parasitic on the right, mechanically connected with an insulator (blue in the drawing). The antenna is in layout similar to the well known VK2ABQ-Square. For use on shortwave-bands spreaders are commonly made of bamboo or glass-fiber reinforced plastics, carrying a radiator and reflector made from wire. Such antennas can be built with little wind load and minimal weight.
L.B. Cebik (W4RNL) made detailed comparisons and calculations of several different versions of Moxon antennas.[4] AC6LA provides a calculator which is based on empirical formulas developed by Cebik.[5]
References
- ^ a b
Labutski, J.P. (KD6WD). Hammer, S. (K6SGH) (ed.). "KD6WD's Moxon antenna project". Archived from the original on 2018-11-24. Retrieved 2019-06-12.
{{cite web}}: CS1 maint: numeric names: authors list (link) — multiple articles and construction reports from Moxon antenna builders. - ^
Moxon, Les A. (G6XN) (1993). HF Antennas for All Locations (2 ed.). Radio Society of Great Britain. ISBN 1-872309-15-1.
{{cite book}}: CS1 maint: numeric names: authors list (link) - ^
Reid, R.E. (KK4OBI). "Moxon antenna modeling – the 4NEC2 optimizer function" (PDF). moxonantennaproject.com. Archived from the original (PDF) on 2017-02-28. Retrieved 2019-06-12.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^
Cebik, L.B. (W4RNL). "The Moxon rectangle: A review". antentop.org. Retrieved 2019-04-18.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^
Maguire, D.J. (AC6LA). "Moxon calculator for Microsoft Windows: Moxon rectangle generator". AC6LA. Retrieved 2019-06-12.
{{cite web}}: CS1 maint: numeric names: authors list (link)
Sources
- Baker, Allen (April 2004). "A 6 meter Moxon antenna". QST Magazine. American Radio Relay League.
External links
- N3WWN. "Moxon calculator for the web browser". n3wwn.futuretek.cx. Archived from the original on 2015-08-02. Retrieved 2019-06-12.
{{cite web}}: CS1 maint: numeric names: authors list (link) - KD6WD. "KD6WD's Moxon antenna project". moxonantennaproject.com. Archived from the original on 2018-11-24. Retrieved 2019-06-12.
{{cite web}}: CS1 maint: numeric names: authors list (link)