Specials - "Loop on Ground" RX antenna designer
Design a "Loop on Ground" (LoG) type of receiving antenna. This consists of a loop of wire laid out horizontally on, or just above, the ground surface. The loop can have basically any shape at all - rectangular, circular, triangular, and so on, and can be fed at any point along its' circumference. This designer deals only with rectangles, and offers only three different feed-point positions, but it will soon become clear to the user that the receive patterns change very little with loop shape and/or feed-point.
The loop gives very good all-round receive, with low-elevation angles especially on conductive ground and - notwithstanding the lower signal strength compared to other more conventional antennas - the LoG antenna often has a very low SNR (signal-to-noise ratio). Since the gain figures are so low - typically between -45dBi to -20dBi - this is a receive only antenna: transmitting into it would cause very high losses to ground.
It is recommended that one uses a loop that no more than one electrical wavelength in circumference, adjusted for the insulation of the wire, on the shortest wavelength on which you intend to operate. Read more...
Get started » » »
- 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.
- 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.
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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
scroll down in the page
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.
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Set antenna color: |
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"Ground Loop" antenna designer
Antenna feed-point: ⬥
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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.
Read more...
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Choose ground type of
land in the vicinity of the antenna: |
Conductivity:
S/m
Dielectric const.:
F/m
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Choose ground
solution type: |
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| View radiation patterns: |
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| Set ref. elevation angle: |
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| View VSWR chart: | Check on: From: To: |
| Impedance curves scales: | |
| View currents diagram: | |
| View Smith chart: |
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Antenna gains at 0° elevation: |
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| Antenna impedance: | |
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