Feko is a comprehensive electromagnetic solver with multiple solution methods that is used for electromagnetic field analyses
involving 3D objects of arbitrary shapes.
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.
Solver methods can be categorized as either source-based methods or field-based methods. Understanding the main differences
between these two categories helps to understand and choose an appropriate solution method for each application.
The Solver includes multiple frequency and time domain solution methods. True hybridisation of some of these methods enables efficient
analysis of a broad spectrum of electromagnetic problems. You can also use more than one solver method for cross-validation
purposes.
Full wave solutions rigorously solve Maxwell's equations without making any assumptions regarding the nature of the electromagnetic
problem. The solution can be either in the frequency or the time domain.
Asymptotic solution methods solve Maxwell's equations, but make certain assumptions regarding the nature of the problem.
Feko provides various high frequency asymptotic solution methods that assume the frequency of interest is high enough that
the structure is much larger than the wavelength.
The ray launching geometrical optics (RL-GO) is a ray-based method intended for modelling electrically large dielectric and perfect electrically conducting structures
in applications such as lens antennas and radar cross section (RCS) analysis.
The uniform theory of diffraction (UTD) is formulated for modelling electrically extremely large structures. The UTD is an asymptotic high-frequency numerical method similar to the PO.
The windscreen antenna solution method reduces the computational requirements by meshing only metallic elements while analysing
the behaviour of the integrated windscreen antennas within their operating environment. The analysis can take into account
the physical features of windscreen antennas and their surroundings.
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.
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.
The Solver includes multiple frequency and time domain solution methods. True hybridisation of some of these methods enables efficient
analysis of a broad spectrum of electromagnetic problems. You can also use more than one solver method for cross-validation
purposes.
Asymptotic solution methods solve Maxwell's equations, but make certain assumptions regarding the nature of the problem.
Feko provides various high frequency asymptotic solution methods that assume the frequency of interest is high enough that
the structure is much larger than the wavelength.
The uniform theory of diffraction (UTD) is formulated for modelling electrically extremely large structures. The UTD is an asymptotic high-frequency numerical method similar to the PO.
The uniform theory of diffraction (UTD) is
formulated for modelling electrically extremely large structures. The UTD is an asymptotic high-frequency numerical method similar to the
PO.
Users typically attempt a solution with the MoM, and when
they realise that the structure is electrically too large to solve with their available resources
(platform memory and time), they turn to the MLFMM. If the
required resources are still too large, the PO, UTD or ray launching geometrical optics (RL-GO) can be used.
Feko hybridises the current-based accurate MoM with the UTD. Bidirectional
coupling between the MoM and UTD is maintained in the solution (through modification of the
interaction matrix) to ensure accuracy. Frequency does not affect the memory resources required
for solving a structure with UTD, given that only points of
reflection from surfaces and diffraction from edges or corners are considered without meshing the
structure.
Multiple reflections, edge and corner diffraction, double diffraction and creeping waves is
taken into account. Insight into the propagation of rays are provided in POSTFEKO during post-processing. Currently, the numerical formulation of
the UTD only allows it to be applied to flat polygonal plates
with minimum edge lengths in the order of a wavelength. A single cylinder can be included in the
model. The UTD is well suited to the analysis of ships at
radar frequencies but less appropriate for analysing complex objects with curved surfaces (such
as automobiles).