Design a vertical antenna for portable use. Vertical antennas for portable use are designed for one principal HF/VHF/UHF amateur band only; they have an advantage over other types of antenna in that they receive and transmit omni-directionally, i.e. in all directions. Radiation patterns in elevation typically show low-angle vertically-polarized radiation, so verticals can be very good DX antennas, especially when used in open areas free of vertically-oriented conducting objects like trees, etc. Read more...
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Vertical antenna designer
Antenna feed-point: ⬥
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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 -
generally speaking, when an antenna is erected on a hill-top or mountain summit, surrounding sloping ground will often cause angles in
the elevation radiation pattern to be lowered in the direction of the
slope.
This is not, however, the case with vertical antennas, since the vertically-polarized waves radiated by the antenna are
emitted horizontally, such that reflections from the ground will be minimal, with the resulting elevation radiation pattern
being largely unaffected by downward-sloping ground.
A more profound effect on the take-off angle from vertical antennas arises from the conductivity of the ground immediately surrounding
the antenna: the higher the ground conductivity, the lower will be the take-off angle. Try it!
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: |
Set elevation angle for azimuth plot:
Set azimuth angle for elevation plot: |
View VSWR chart: | |
Display impedance curves: | Using unun |
Impedance curves scales: | |
View currents diagram: | |
View Smith chart: | |
Antenna gains at 0° elevation: |
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Antenna impedance: | |
Frequency range: | |