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.
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.
Characteristic mode analysis (CMA) is the numerical calculation of a weighted set of orthogonal current modes that
are supported on a conducting surface. The sets of characteristic near fields and far fields associated with these
characteristic currents can provide insight into the radiating properties of structures, allowing for a systematic
approach to antenna design and placement.
The example illustrates the synthesis method of the application macro. Optionally, the design method can be used to specify a custom weighting coefficient.
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.
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.
The example illustrates the synthesis method of the application macro. Optionally, the design method can be used to specify a custom weighting coefficient.
The example illustrates the synthesis method of the application macro. Optionally, the design method can be used to specify a
custom weighting coefficient.
An example of the antenna and plate model is shown below. The antenna is excited at the
corner of the plate with a voltage source; for this example, the frequency range is 700
MHz to 960 MHz.
Tip: Find the examples in the <FEKO_SHARED_HOME>
directory:
The model is set up with a CMA configuration and the following requests:
A CMA request with 20 modes and the Compute modal excitation
coefficients check box is selected.
A far field request with the default 3D pattern.
A current request calculating all the currents on the structure.
An additional standard configuration with the same far field and current requests
is added to compare the weighted sum results with the full method of moments (MoM) solution.
Note: Use the CMA plotter application macro to plot CMA quantities and to determine the
dominant modes at the frequency of interest.
Using the Macro
Execute the CM_synthesis_and_design.luaapplication macro in POSTFEKO to calculate the weighted sum for the characteristic modes of interest.