Far Fields
View the quantities and properties that are available for a far field request.
On the Home tab, in the Add results group, click the Far field icon.
Quantity  Properties 

Electric field  Total 
Gain  Theta 
Realised gain  Phi 
Directivity  Ludwig III (Co) 
Radar cross section (RCS)  Ludwig III (Cross) 
LHC  
RHC  
Axial ratio  Minor / Major 
Major / Minor  
Handedness 
The options available for far fields:
 Total
 The total value independent of the polarisation.
 Theta
 The vertical (or $\theta $ ) component.
 Phi
 The horizontal (or $\varphi $ ) component.
 Ludwig III (Co)
 The reference polarisation as defined by Ludwig for conventional measurement configurations.
An antenna that is Z directed implied for which the reference polarisation is
intended along the
$\varphi ={90}^{\circ}$
cut.$$LII{I}_{Co}(\theta ,\varphi )=E(\theta ,\varphi )\cdot \left[\mathrm{sin}\left(\varphi \right){\widehat{i}}_{\theta}+\mathrm{cos}(\varphi ){\widehat{i}}_{\varphi}\right]$$
 Ludwig III (Cross)

The cross polarisation as defined by Ludwig for conventional measurement configurations. An antenna that is Z directed implied for which the reference polarisation is intended along the $\varphi ={0}^{\circ}$ .
$$LII{I}_{Cross}(\theta ,\varphi )=E(\theta ,\varphi )\cdot \left[\mathrm{cos}\left(\varphi \right){\widehat{i}}_{\theta}\mathrm{sin}(\varphi ){\widehat{i}}_{\varphi}\right]$$Conventions for the Ludwig coordinate system are defined by the following parameters: $\theta $ and $\varphi $
 Rotational angles in the spherical coordinate system as defined in Feko.
 ${\stackrel{\u2322}{i}}_{\theta}$
 Directional unit vector in the $\theta $ direction.
 LHC
 The left hand circularly polarised component. The polarisation vector rotates counter clockwise when viewed from a fixed position in the direction of propagation.
 RHC
 The left hand circularly polarised component. The polarisation vector rotates counter clockwise when viewed from a fixed position in the direction of propagation.
 Z (+45°)
 When viewed in the direction of propagation, the
$\theta $
unit vector points downwards and the
$\varphi ={90}^{\circ}$
unit vector to the left. The Zpolarisation vector is
then$${\widehat{i}}_{Z}=\frac{\left({\widehat{i}}_{\theta}+{\widehat{i}}_{\varphi}\right)}{\sqrt{2}}$$which lies along an axis rotated +45 degrees from horizontal (in a counter clockwise direction) — coinciding with the direction of the diagonal line of the Z.
 S (45°)
 The Spolarisation unit vector is $${\widehat{i}}_{S}=\frac{\left({\widehat{i}}_{\theta}+{\widehat{i}}_{\varphi}\right)}{\sqrt{2}}$$which rotated by 45° from horizontal and lies in the direction approximated by the diagonal of the S.
 Minor/Major
 Displays the magnitude of the axial ratio using the axes specification, Minor/Major.
 Major/Minor
 Displays the magnitude of the axial ratio using the axes specification, Major/Minor.
 Handedness
 Displays the sign information for axial ratio on a sphere using different colours for left hand rotating, linear and right rotating fields.