Near Field Coordinate Systems (FE card)
The coordinate systems for the FE card have specific definitions/conventions. Use the appropriate coordinate system for the application.
Cartesian coordinates x, y, z
Figure 1. Field calculation in the Cartesian coordinate system.
Observation point:
Unit vectors of the coordinate system:
Cylindrical coordinates around Z axis , ,
Figure 2. Field calculation in the Cylindrical coordinate system.
Observation point:
Unit vectors of the coordinate system:
Spherical coordinates , ,
Figure 3. Field calculation in the spherical coordinate system.
Observation point:
Unit vectors of the coordinate system:
Cylindrical coordinates around X axis , ,
Figure 4. Field calculation in the Cylindrical coordinate system around the X axis.
Observation point:
Unit vectors of the coordinate system:
Cylindrical coordinates around Y axis , ,
Figure 5. Field calculation in the Cylindrical coordinate system around the Y axis.
Observation point:
Unit vectors of the coordinate system:
Conical coordinates around the Z axis ,
Figure 6. Field calculation in the Conical coordinate system.
This option is similar to the field calculation in cylindrical coordinates around the Z axis, where the radius changes with the height :
Observation point:
Unit vectors of the coordinate system: