Define Near Field from Data

Apply an array of electric and magnetic dipoles in the model (in the form of a planar aperture) that is equivalent to measured or calculated field values.

Source Files
The user can import the E-Field and H-Field files by pressing the Browse button and selecting the text files in their hard drive. These files contain the electric and magnetic field for every point in the U and V direction, four columns for the E-Field file with EU (Amplitude V/m), EU (Phase deg), EV (Amplitude V/m), EV (Phase deg); and four columns for the H-Field file with HU (Amplitude V/m), HU (Phase deg), HV (Amplitude V/m), HV (Phase deg) (see Figure 2).

Figure 1. Define Near Field
  • Start reading from line number: Skip this number of lines before reading the field values.

    Figure 2. E-Field file example
  • Cartesian Coordinate System: Allows the user to define the planar aperture, the E-Field and H-Field files must contain a field value for each point defined in this section.
    • Width (W): Array size in U direction.
    • Height (H): Array size in V direction.
    • Number of points (U): The number of points in U direction.
    • Number of points (V): The number of points in V direction.
  • Displacement: This parameter is a vector that specifies the translation applied to the points when added to the simulation.
  • Orientation: This parameter allows the rotation applied to the points. There are several ways the user can specify this rotation: by giving each of the axis directions of the transformation, by specifying spherical rotation angles, by specifying rotation angles on each axis or by specifying the Z axis and a rotation angle.

If the Relative to reference plane check box is selected, the displacement and rotation will be relative to the current reference plane coordinate system.

When the user has finished setting up the parameters of the Near Field Source, they need to press the Save button in order to add the antenna to the simulation.

Figure 3. Near Field Source