Xnecview - animation of a dipole
The above picture shows how several quantities on and near a
half-wave dipole vary in the course of time.
These quantities are indicated by different colours, as follows:
The dipole itself is on the Y axis, in the bottom left corner of the picture.
The electric and magnetic field strength has only been calculated in the first
quadrant of the YZ plane. Because of symmetry, extending the calculation to
other positions would not add anything significant.
Although this is not immediately obvious from the picture, the electric field vectors
lie in the YZ plane, while the magnetic field is perpendicular to this plane.
If you run Xnecview on your own computer, you can manipulate the view with the
mouse, to see this three-dimensional structure more easily.
- Currents: indicated by blue lines, with lenght proportional to the magnitude.
- Charges: indicated by cyan and magenta square around the wire on which the
charge is "sitting". The size of the square represents the magnitude,
the colour the sign: cyan for positive, magenta for negative charge.
- Electric field vectors: indicated by red lines.
- Magnetic field vectors: indicated by green lines.
The NEC input file for the above is available
Back to the Xnecview page.