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Feko Application Macros
A large collection of application macros are available for CADFEKO and POSTFEKO.
POSTFEKO Application Macros
A collection of Lua application macros are available to automate repetitive tasks in POSTFEKO.
Multiport Post-Processing
The Multiport post-processing application 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.
Create a Multiport Lua Settings File
The Multiport post-processing application macro can be configured to use a Lua settings file to define the loading and excitation for each port. This simplifies the procedure for frequent calculations or large multiport setups with many ports.
Active Port Configuration
Set up the Lua settings file for the active ports in a multiport active ports configuration. Each active port in the configuration requires an excitation and a load specification.

Welcome
Release Notes
See what's new in the latest release.
Get Started
The Feko Getting Started Guide contains step-by-step instructions on how to get started with Feko.
Examples
The Feko Example Guide contains a collection of examples that teaches you Feko concepts and essentials.
Introduction to Feko
Feko is a comprehensive electromagnetic solver with multiple solution methods that is used for electromagnetic field analyses involving 3D objects of arbitrary shapes.
CADFEKO
CADFEKO is used to create and mesh the geometry or model mesh, specify the solution settings and calculation requests in a graphical environment.
POSTFEKO
POSTFEKO, the Feko post processor, is used to display the model (configuration and mesh), results on graphs and 3D views.
EDITFEKO
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.
Feko Solution Methods
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.
Optimisation in Feko
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 Utilities
The Feko utilities consist of PREFEKO, OPTFEKO, the Launcher utility, Updater and the crash reporter.
Description of the Output File of Feko
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.
Feko Application Macros
A large collection of application macros are available for CADFEKO and POSTFEKO.
- Application Macros
  An application macro is a reference to an automation script, an icon file and associated metadata.
- Application Macro Library
  The application macro library allows commonly used application macros to be stored in a repository.
- CADFEKO Application Macros
  A collection of Lua application macros are available to automate repetitive tasks in CADFEKO.
- POSTFEKO Application Macros
  A collection of Lua application macros are available to automate repetitive tasks in POSTFEKO.
  - Characteristic Mode Plotter
    This POSTFEKO application macro can be used to plot all the standard parameters that are available after a characteristic mode analysis simulation was performed.
  - MIMO Performance Evaluation
    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.
  - Multiport Post-Processing
    The Multiport post-processing application 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.
    - Overview
      The Multiport post-processing application macro calculates the port reflections and field values for changes in port loading, without rerunning the Solver. Through scripting in POSTFEKO, loads can be modified as a post-processing step.
    - Base Multiport Feko Simulation
      A base multiport Feko simulation is required to generate the required input data for the Multiport post-processing application macro.
    - Multiport Post-Processing Workflow
      The basic workflow of the Multiport post-processing application macro (MultiportPostProcessing.lua) is described.
    - Create a Multiport Lua Settings File
      The Multiport post-processing application macro can be configured to use a Lua settings file to define the loading and excitation for each port. This simplifies the procedure for frequent calculations or large multiport setups with many ports.
      - Active Port Configuration
        Set up the Lua settings file for the active ports in a multiport active ports configuration. Each active port in the configuration requires an excitation and a load specification.
      - Non-Active Port Configuration
        Set up the load configuration to modify the load attached to a non-active port. There are three load configuration types: individual (single port definition), multiport single Touchstone (one Touchstone file for all the ports), and multiple single port Touchstone files (one file for each port). Only one configuration type can be used per calculation.
      - Field Data Configuration
        Set up the field data configuration table to be used with the measurement method to map to the correct near field or far field data (available under Stored data in the .pfs file).
      - Processing Options
        Set up the processingOptions table to be used with the command-line interface. The processingOptions table defines which data is exported as well as setting non-default values.
    - Command Line Arguments for Launching the Multiport Post-Processing Macro
      The Multiport application macro can be called via the command line through POSTFEKO. Use the --configure-script argument to pass configuration information to the multiport post-processing script.
    - Output File Format for Scaling Coefficients
      The file format and data structure for the output files (.xml and .mat) are described. These files are generated for storing the scaling coefficients for a multiport calculation.
    - Multiport Post-Processing Limitations
      The Multiport post-processing application macro has several limitations.
    - Example 1: Feko Model as Input
      Example 1 uses a CADFEKO model (plate4prt.cfx) as input for the Multiport post-processing.
    - Example 2: Measurements (Stored Data) from a POSTFEKO Session as Input
      Example 2 shows how to use stored far field and near field data, in a POSTFEKO session with a multiport S-parameter Touchstone (.snp) file in the Multiport post-processing application macro.
    - Example 3: Lua Settings File to Define Loading and Excitation for Each Port
      Example 3 shows how to use a Lua settings file to set up the multiport active and non-active port configurations.
    - Example 4: Command-Line Interface
      The multiport application macro supports calculation from the command-line by calling the application macro via POSTFEKO.
  - Plot Multiple S-Parameter Traces Macro
    Plot multiport S-parameter results.
  - Tile Windows
    An application macro to tile any POSTFEKO views side-by-side.
  - Plot Interference Matrix
    This application macro uses the S-parameter data from a Feko simulation to display a coupling matrix for a multi-port scenario.
  - Characteristic Mode Synthesis and Design
    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.
  - Reciprocal Configuration
    The antenna reciprocity theorem relates the antenna load current for given plane wave excitation to the radiation pattern when the antenna is excited. The antenna is assumed to be made of linear and reciprocal components.
  - Other POSTFEKO Application Macros
    A collection of smaller POSTFEKO application macro are available, but these macros do not include step-by-step instructions.
- Shared Application Macros
  A collection of Lua macros are available to automate repetitive tasks where the workflow span both CADFEKO and POSTFEKO.
Scripts and Application Programming Interface (API)
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.
Appendix
Reference information is provided in the appendix.

Active Port Configuration

Set up the Lua settings file for the active ports in a multiport active ports configuration. Each active port in the configuration requires an excitation and a load specification.

Port Excitation Specification

The magnitude and phase for each active ports in the active port configuration are specified as follows:

-- create table to store the source data in 
activePortsConfiguration = {}
-- Source Port1
source = {}
source.Label = "Port1"
source.Index = 1
source.Value = pf.Complex(1,0)
table.insert(activePortsConfiguration,source)

Port Loading Specification

A load table that groups the loading for each port, is added to the active ports configuration. The four loading types for an active port are:

Direct connection (no additional loading)
Complex load
One-port Touchstone network (.s1p)
Two-port Touchstone network (.s2p)

-- Load options to attach to active port.
-- Create load table and load data table
activePortsConfiguration.Load ={}
activePortsConfiguration.Load.Data ={}
-- Type = 1 (direct connection or no loading), 
load = {}
load.Type = 1
table.insert(activePortsConfiguration.Load.Data,load)
-- Type = 2 (complex)
load ={}
load.Type = 2 
load.Value = pf.Complex(50,0)
table.insert(activePortsConfiguration.Load.Data,load)
-- Type = 3 (One port Touchstone network)
load = {}
load.Type = 3
-- Relative path from settings file location on drive
load.Filename = "test.s1p"
table.insert(activePortsConfiguration.Load.Data,load)
-- Type = 4 (Two port Touchstone network)
load = {}
load.Type = 4
-- Relative path from settings file location on drive
load.Filename = "example.s2p"
table.insert(activePortsConfiguration.Load.Data,load)

Note: Measurement data includes the reference impedance when determining the port loading.