Specials - 'VP2E' (Vertically-Polarized 2-Element) antenna designer
Design a 'VP2E' (Vertically-Polarized 2-Element) antenna - a full-wave single-band wire antenna fed off-center at a point where the feed-point impedance is at a minimum (around 75 Ω, and not 50 Ω as claimed by some). The wire is typically arranged as an inverted-V configuration so that much of the current flows vertically, producing predominantly vertical polarization, and without the need for radials or counterpoise. Because a full-wave wire has two current maxima along its length, the antenna behaves somewhat like two vertically separated radiating sections along the antenna wire. This produces a radiation pattern with modest gain and useful low-angle radiation compared with a simple half-wave dipole. Read more...
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- 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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VP2E (Vertically-Polarized 2-Element) antenna designer
portable-antennas.com
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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| View radiation patterns: |
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| Set ref. elevation angle: |
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| Set ref. azimuth angle: |
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Patterns hover info:
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| View VSWR chart: | |
| Display impedance curves: | Using unun |
| Impedance curves scales: |
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| Effect of coax on VSWR: |
Coax length:
Type:
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| View currents diagram: | |
| View Smith chart: |
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Antenna gains at 0° elevation: |
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| Antenna efficiency: | |
| Antenna impedance: | |
| Estimated bandwidth: | |
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