Feko is a comprehensive electromagnetic solver with multiple solution methods that is used for electromagnetic field analyses
involving 3D objects of arbitrary shapes.
3D views are used to display and interact with the model. You can zoom, rotate and pan around a 3D model using the keyboard,
mouse or a combination of both. You can use a 3D mouse, specify a view or select specific parts of a model. Multiple 3D
views are supported.
Define field or current data using either far field data, near field data, spherical mode data or PCB current data. The
field/current definition is used when defining an equivalent source or a receiving antenna.
Define a medium with specific material properties, import a predefined medium from the media library or add a medium from
your model to the media library.
The media library contains a list of predefined and user-defined media. You can either add a predefined medium from the
library to your model or add your medium to the library.
Create a frequency-dependent dielectric using the Debye relaxation method. Use the Debye model to describe the relaxation characteristics of gasses and fluids at microwave frequencies. It is derived for
freely rotating spherical polar molecules in a predominantly non-polar background.
Create a frequency-dependent dielectric using the Cole-Cole method. The method is similar to the Debye relaxation but makes use of an additional parameter to describe the model.
Define a frequency-dependent dielectric by specifying data points at a range of frequencies. The values for the dielectric
properties are linearly interpolated to obtain the dielectric properties at frequency points other than specified.
Defined media can be applied to the model in various ways. Some media settings are applied to regions, others on faces
and wires. The rules for defining media varies between the different solution methods.
Use a periodic boundary condition (PBC) to analyse infinite periodic structures. A typical application of PBC is to
analyse frequency selective surface (FSS) structures.
Create an arbitrary finite antenna array that consists of an array of contributing elements, either with direct feeds for
each element or via indirect coupling, and solve with the efficient domain Green's function method (DGFM).
Use the windscreen tools to define a curved reference surface constrained by a cloud of points, normals and optional U′V′ parameters. The constrained surface is then used as a reference to create a work surface where windscreen layers and curved
parameterised windscreen antenna elements can be created.
Many electromagnetic compatibility and interference problems involve cables that either radiate, irradiate or cause coupling
into other cables, devices or antennas. Use the cable modelling tool and solver to analyse the coupling and radiation.
For a frequency domain result, the electromagnetic fields and currents are calculated at a single frequency or frequency
range. When the finite difference time domain (FDTD) solver is used, the frequency must be specified to convert the native time domain results to the frequency domain.
The excitation of an antenna is normally specified as a complex voltage, but it may be useful to specify the total radiated
or source power instead. The result is then scaled to yield the desired source power level.
A port is a mathematical representation of where energy can enter (source) or leave a model (sink). Use a port to
add sources and discrete loads to a model.
Obtain multiple solutions for a single model using multiple configurations. Multiple configurations remove the requirement
to create multiple models with different solution requests.
Use an infinite plane or half-space to model a ground plane efficiently. The number of triangles in the model is reduced
as the ground plane is not discretised into triangles.
A CADFEKO.cfm file can be imported into EDITFEKO to make use of more advanced features available in EDITFEKO and to directly edit the .pre file for more flexible solution configurations.
During the design process, the development of a model can introduce a range of issues that can lead to a non-simulation-ready
model. Use the validation toolset to verify that the model is simulation-ready or to search, detect and flag discrepancies.
The default solver used in Feko is the method of moments (MoM) - surface equivalence principle (SEP). Whether a solver is specified per model, per face or per region, depends on the solver in question.
CADFEKO has a collection of tools that allow you to quickly validate the model, for example, perform calculations using
a calculator, measure distances, measure angles and export images.
EDITFEKO is used to construct advanced models (both the geometry and solution requirements) using a high-level scripting language
which includes loops and conditional statements.
One of the key features in Feko is that it includes a broad set of unique and hybridised solution methods. Effective use of Feko features requires an understanding of the available methods.
Feko offers state-of-the-art optimisation engines based on generic algorithm (GA) and other methods, which can be used
to automatically optimise the design and determine the optimum solution.
Feko writes all the results to an ASCII output file .out as well as a binary output file .bof for usage by POSTFEKO. Use the .out file to obtain additional information about the solution.
CADFEKO and POSTFEKO have a powerful, fast, lightweight scripting language integrated into the application allowing you to create
models, get hold of simulation results and model configuration information as well as manipulation of data and automate
repetitive tasks.
Define a medium with specific material properties, import a predefined medium from the media library or add a medium from
your model to the media library.
Define a frequency-dependent dielectric by specifying data points at a range of frequencies. The values for the dielectric
properties are linearly interpolated to obtain the dielectric properties at frequency points other than specified.
Creating a Dielectric Medium from a Frequency List
Define a frequency-dependent dielectric by specifying data points at a range of
frequencies. The values for the dielectric properties are linearly interpolated to obtain
the dielectric properties at frequency points other than specified.
On the Construct tab, in the Define group, click the Media icon. From the drop-down list, select the Dielectric medium icon.
In the Definition method field, from the drop-down list select Frequency list (linear
interpolation).
Specify if the frequency points are manually entered or imported from a
file.
Select one of the following:
To enter each frequency point, click Dielectric loss
tangent or Conductivity and enter the
dielectric properties for each frequency point.
To import the frequency points from a file, click Import
points.
In the Filename field, browse
for the file you want to import.
[Optional] In the Scale by
field, enter a value to scale the points.
For example, if you import a value of “2”, scale it by
“10e9” to change the value to 2 GHz.
Under Delimiter, click the
delimiter type you use in your file.
Click OK to close the
Import points dialog.
[Optional] Specify the magnetic properties of the
dielectric.
[Optional] In the Mass density
(kg/m^3) field, enter a value for ρ.
In the Label field, enter a
unique label for the dielectric.
Click Create to create the
dielectric and close the dialog.