DataSet Structure: Near Field
Near field results must contain a complete set of either electric field components, magnetic field components, or both in order to be valid.
For each different coordinate system, a different set of spatial axes are required. See Table 1 for the required properties for near fields.
Property name | Property type | Description |
---|---|---|
Frequency | Axes | Every near field requires a valid frequency axis. (Hz) |
Axis 1...3 | Axes | Every near field requires three independent spatial axes. Depending on the coordinate system, these axes may vary. Table 2 gives a breakdown of the required axes for each system. |
MediumNames | Axes | The value is an index into the MediumNames table in the MetaData section of the DataSet. |
EFieldComp1...3 | Quantities | Required quantity set for electric fields. All three complex values must be defined for a complete electric field definition. ( ) |
HFieldComp1...3 | Quantities | Required quantity set for magnetic fields. All three complex values must be defined for a complete magnetic field definition. ( ) |
MediumIndex | Quantities | A scalar quantity that links to the list of media names under the MetaData list MediumNames |
Conical | MetaData | A boolean flag indicating whether the near field is defined in a conical coordinate system. The value may be either true or false. |
MediumNames | MetaData | A list of names for the media in which a near field point was calculated. An index to this list is provided for each point under the MediumIndex quantity. |
Origin | MetaData | The local origin for the workplane around which the near field is defined. |
UVector | MetaData | A point relative to the origin which indicates in which direction the vector. |
VVector | MetaData | A point relative to the origin which indicates in which direction the vector. |
RhoStepSize | MetaData | A scalar value indicating the increment with which the cone’s rho
axis increases. This effectively controls the angle of the cone for a
conical system. Note: Only required if Conical is
true.
|
- Conical = true
- This flag indicates to POSTFEKO that the DataSet fields must be interpreted differently than other coordinate systems.
- RhoStepSize
- The step size indicates the intervals with which the rho axis grows.fNote: The rho axis only contains a single value which corresponds to the starting point of the cone.
Coordinate system | Axis 1 | Axis 2 | Axis 3 |
---|---|---|---|
Cartesian | X | Y | Z |
Spherical | R | Theta | Phi |
Cylindrical (X axis) | Rho | Phi | X |
Cylindrical (Y axis) | Rho | Phi | Y |
Cylindrical | Rho | Phi | Z |
Conical | Rho | Phi | Z |