# DataSet Structure: Far Field

Table 1. Required properties for far fields.
Property name Property type Description
Frequency Axes Every far field requires a valid frequency axis. (Hz)
Spatial Axis 1 Axes The first spatial axis, depending on the coordinate system.
• Theta (when using spherical coordinates) is the elevation angle component relative to the local workplane. The vertical position is located at $\theta ={0}^{\circ }$ . (deg)
• X (when using Cartesian coordinates) is the $u$ component of the unit vector relative to the local workplane.
Spatial Axis 2 Axes The second spatial axis, depending on the coordinate system.
• Phi (when using spherical coordinates) is the azimuthal angle component relative to the local workplane. (deg)
• Y (when using Cartesian coordinates) is the $v$ component of the unit vector relative to the local workplane.
IncidentTheta Axes The theta direction from where an incident plane wave originates. (deg)
IncidentPhi Axes The phi direction from where an incident plane wave originates. (deg)
Theta Quantities This is a complex value indicating the theta component of the electric field in the theta direction, or ${E}_{\theta }$ . (V)
Phi Quantities This is a complex value indicating the phi component of the electric field in this phi direction, or ${E}_{\varphi }$ . (V)
DirectivityFactor Quantities A scaling factor that scale the magnitude of a field value to the expected directivity in a given direction.
GainFactor Quantities A scaling factor that scale the magnitude of a field value to the expected gain in a given direction.
RealisedGainFactor Quantities A scaling factor that scale the magnitude of a field value to the expected realised gain in a given direction.
RCS Quantities A scaling factor that scale the magnitude of a field value to the expected radar cross section for a given observation direction.
Origin MetaData The local origin for the workplane around which the far field is defined.
UVector MetaData A point relative to the origin which indicates in which direction the $u$ vector.
VVector MetaData A point relative to the origin which indicates in which direction the $v$ vector.