Moxon antenna designer

Design a lightweight Moxon antenna for the upper HF bands and VHF. The Moxon is basically a compact version of a 2-element Yagi with folded elements, designed for a single band, with a feed-point impedance very close to 50 ohms, and offers good forward gain and very good front-to-back F/B ratio. The antenna can be oriented either horizontally or vertically, with polarization following the configuration, and with subtle differences in radiation patterns. It is most effective when mounted fairly low above ground level, depending on the communication distance of interest to the operator.  Read more...

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  1. Use the controls on the left-hand side to configure your antenna - set the design frequency, antenna element lengths and angles, wire diameter, wire insulation if required, support height, etc.
  2. When you are happy with your configuration, press the "Show antenna" button to display your antenna in interactive 3D graphics mode in the area on the right-hand side. Each time you change your configuration, you should press the "Show antenna" button to register the changes to the app.
  3. After you have configured your antenna, you can then use the controls further down in the page to generate charts and diagrams to evaluate the antenna's performance - you will need to to access these controls.
    You can choose to view any combination of the available charts and diagrams: these include four radiation pattern types: azimuth, elevation, 3D and polarization patterns; other options include VSWR charts, an antenna currents diagram, and a Smith chart.

Set antenna color:    

Principal band
Band:
Frequency: kHz
Antenna configuration
Configure as a:
Antenna material
Material type:  
Diameter: mm
Insulation:   
Ins. type:   Corr. factor:
Antenna support
Height: m (At antenna's lowest point)
Driver element
Long side: m
Short side: m
Reflector element
Long side: m
Short side: m
Antenna overview
Support
height 		Reflector element Driver element Elements
Gap
Long side Short side Long side Short side
 
 Moxon antenna designer
  1. Use the controls on the left-hand side to configure your antenna.
  2. When you are happy with your configuration, press the "Show antenna" button to display your antenna in interactive 3D graphics mode in this area.
  3. After you have configured your antenna, you can then use the controls further down in the page to generate charts and diagrams to evaluate the antenna's performance ...
Antenna feed-point: ⬥
 

Antenna performance

Here you can generate plots of radiation patterns, VSWR chart, antenna currents diagram and Smith chart for your antenna over a choice of ground types. By changing the physical dimensions of the antenna, and refreshing these plots, you can learn a lot about how such antennas will perform in the field.
Please note that radiation patterns are here modelled over flat ground - when the antenna is erected on a hill-top or mountain summit, the surrounding sloping ground will generally cause angles in the elevation radiation pattern to be lowered in the direction of the slope: the steeper the slope, the lower the effective elevation take-off angle will be, and the better the chances of making long-distance contacts.

Choose ground type of
land in the vicinity
of the antenna: 		   Conductivity: S/m    Dielectric const.: F/m
 
View radiation patterns:    Set elevation angle for azimuth plot:     ?
  Set azimuth angle for elevation plot:     ?

?
View VSWR chart:
Impedance curves scales:   
View currents diagram:
View Smith chart:
Antenna gains
at 0° elevation:
Antenna impedance:
Frequency range: