Altair Feko: What are the restrictions when using media and solution methods

Esti

This article lists the restrictions when using different types of media, coatings and solution methods.

 

Restrictions when using dielectrics

Solution Method	Dielectric	Layered Dielectric (2D)	Anisotropic Layered Dielectric (2D)	Anisotropic Dielectric (3D)
MoM	Yes	Yes – properties must differ from the surrounding medium	Yes	No
FEM	Yes	Yes - properties must differ from the surrounding medium	Outside FEM region	Yes
FDTD	Yes – non-dispersive	No	No	Yes, biaxial
PO	Limited reflection only No metal	Yes	No	No
LE-PO	No	No	No	No
RL-GO	Yes	Yes	No	No
UTD	No	Yes (reflection only)	No	No
Faceted UTD	No	Yes (reflection and transmission)	No	No
CMA	Yes	Yes	Yes	No
CBFM	No	Yes	Yes	No
Dielectric Surface Impedance Approximation	Yes	Yes	No	No
VEP	Yes	Yes	No	No

 

 

Restrictions when using metallic, impedance sheet, characterised surface and windscreen

Solution Method	Metallic	Impedance Sheet	Characterised Surface	Windscreen
MoM	Yes	Yes	Yes	Yes
FEM	Yes -  inside and outside FEM region	Yes – inside and outside FEM region	No	Yes
FDTD	PEC only	No	No	No
PO	PEC only	No	No	No
LE-PO	PEC only	No	No	No
RL-GO	PEC only	No	Yes	No
UTD	Yes	No	No	No
Faceted UTD	PEC only	Yes (reflection and transmission)	Yes (reflection and transmission)	No
CMA	Yes	Yes	No	Yes
CBFM	Yes	Yes	No	No
Dielectric Surface Impedance Approximation	Yes	Yes	No	Yes
VEP	Yes	Yes	No	No

 

 

Restrictions when using coatings

Solution Method	Coatings
	Electrically Thin	Electrically Thick (Single Layer Only)
MoM	Yes	Yes – on closed PEC region
FEM	Yes – inside and outside FEM region	No
FDTD	No	No
PO	Yes	Yes
LE-PO	No	No
RL-GO	Yes	Yes
UTD	Yes	Yes
Faceted UTD	Yes	No
CMA	Yes	No
CBFM	Yes	No
Dielectric Surface Impedance Approximation	No	No
VEP	Yes	No