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.
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.
This POSTFEKOapplication macro can be used to plot all the standard parameters that are available after a characteristic mode analysis simulation
was performed.
This application macro is used for calculating mean effective gain (MEG) and envelope correlation coefficient (ECC) for a MIMO antenna configuration.
The MEG ratio can also be plotted.
The Multiport post-processingapplication macro allows you to calculate results for changes in the port loading without rerunning the Solver. Results that are supported are far fields, near fields, currents and specific port parameters, for example,
the voltage, current and S-parameters of each port.
An interference matrix is a way to illustrate the cross-coupling between ports of a multiport system. Example applications
are antenna arrays, feed networks or power dividers.
The characteristic mode synthesis and design application macro is a post-processing application macro that can be used to calculate a weighted sum for the currents, near fields, and far fields requests for specific
characteristic modes of interest. The application macro uses a modified version of the modal weighting coefficient (MWC) to use the radiating phase when synthesising
the results with the macro.
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.
An antenna array is used to show the workflow of the application macro and calculate the interference matrix for the multiport
scenario.
In three_dipole_example.cfx, three dipole antennas are created and
positioned a distance from each other. Electric symmetry is used to reduce runtime but
is not required.
Tip: Find the examples in the <FEKO_SHARED_HOME>
directory:
In the S-parameter solution request, all the ports are added, and the
characteristic impedance for each port is set to 50 ohms.
Restriction: All ports of interest need to be added to the S-parameter request, and all ports in the request must be set active.
The application macro calculates the complete interference
matrix for all ports in the request.
Using the Application Macro
Execute the application macro in POSTFEKO to determine the interference matrix for the multiport S-parameter calculation.