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Appendix
Reference information is provided in the appendix.
Summary of Files
Feko creates and uses many different file types. It is useful to know what is stored in the various files and weather they were created by Feko and if it is safe to delete them. The files are grouped as either native files that have been created by Feko or non-native files that are supported by Feko. Non-native files are often exported by Feko even if the formats are not under the control of the Feko development team.
Native Files
Feko native files are files created and used by Feko. The format of these files is maintained by Feko.
File Format Details
The history and format of Feko native files, such as the .efe, .hfe, .ffe, .ol, .os and .epl are described.
File Format History
A list of notable changes to the format of the .efe, .hfe, .ffe, .ol, .os and .epl is provided.

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, ADAPTFEKO, 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.
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.
- Application Programming Interface (API)
  CADFEKO and POSTFEKO have a powerful, fast, lightweight scripting language integrated into the application that allows you to create models, get hold of simulation results and model configuration information and much more.
- EDITFEKO Cards
  Each geometry and calculation request are entered on a separate line in the .pre and are referred to as cards.
- How-Tos
  A collection of how-tos are included that covers advanced concepts.
- FAQ
  A collection of frequently asked questions (FAQ) relating to advanced concepts are included.
- Troubleshooting
  Common problems that you may encounter are discussed as well as their solutions.
- Meshing
  When meshing a model, you can either use the automatic meshing algorithm to calculate the appropriate mesh settings or you can specify the mesh sizes. When you specify the mesh sizes, the mesh sizes should adhere to certain guidelines.
- SAR Standards
  Feko makes use of a local peak SAR algorithm.
- Solution Control
  Control the execution of Feko by specifying the memory management and environment variables.
- Read MAT, LUD, RHS and STR Files
  The .mat file, .lud file and .rhs file are not generated by default, but can be read externally.
- Integration With Other Tools
  Feko integrates with various products within Altair HyperWorks Products such as HyperStudy. Integration with third-party products is also supported through the powerful scripting and plug-in infrastructure.
- SPICE3f5
  Use the correct structure, convention and syntax for a SPICE circuit definition in Feko.
- List of Acronyms and Abbreviations
  View the list of commonly used acronyms in Feko.
- Summary of Files
  Feko creates and uses many different file types. It is useful to know what is stored in the various files and weather they were created by Feko and if it is safe to delete them. The files are grouped as either native files that have been created by Feko or non-native files that are supported by Feko. Non-native files are often exported by Feko even if the formats are not under the control of the Feko development team.
  - Native Files
    Feko native files are files created and used by Feko. The format of these files is maintained by Feko.
    - List of Native Files and Descriptions
      A list of native files with descriptions is given.
    - File Format Details
      The history and format of Feko native files, such as the .efe, .hfe, .ffe, .ol, .os and .epl are described.
      - File Format History
        A list of notable changes to the format of the .efe, .hfe, .ffe, .ol, .os and .epl is provided.
      - General File Format
        A common data structure exists for the .efe, .hfe, .ffe, .ol, .os, .tr and .epl files, which should be understood to use or post-process these files externally.
      - Electric / Magnetic Near Fields (.EFE / .HFE)
        The data structure for the .efe and .hfe files are described.
      - Far Fields (.FFE)
        The data structure for the .ffe files is described.
      - Surface Charge Density (.OL)
        The data structure for the .ol files are described to understand and correctly post-process these files externally.
      - Surface Current Density (.OS)
        The data structure for the .os files is described .
      - Transmission / Reflection Coefficients (.TR)
        The data structure for the .tr files are described to understand and correctly post-process these files externally.
      - Element Power Loss (.EPL)
        The data structure for the .epl files are described to understand and correctly post-process these files externally.
      - Multiport Combinations Configuration (.MCC)
        The data structure for the .mcc file is described to understand and setup the file for a multiport calculation correctly. A template file is created when a multiport data package file is generated from a S-parameter configuration.
      - Other Supported File Formats
        The data structure for other file types are provided in order to understand and correctly use or post-process these files externally.
  - Non-Native Files
    Various files are used and even exported by Feko that are not native to Feko, meaning that the format is not controlled by Feko. The format of these files are subject to change by third parties.
- Common Errors and Warnings
  A Feko Errors, Warnings and Notes Reference Guide is available as a reference for messages that may be encountered in Feko.

File Format History

A list of notable changes to the format of the .efe, .hfe, .ffe, .ol, .os and .epl is provided.


Version	Description of Changes	File Type	Release Version
2	New file formats. Used as baseline for all future changes.	.efe .hfe .ffe .ol .os	6.1
3	Support for characteristic mode analysis: Characteristic Mode Index	.efe .hfe .ffe .ol .os	6.2
4	Support for configuration name in the header block: Configuration Name	.efe .hfe .ffe .ol .os	14.0.410
5	Support for exporting transmission / reflection coefficients to a .tr file.	.tr	2018
5	Support for aperture sources in a Cartesian boundary coordinate system: Coordinate System Cartesian Boundary	.efe .hfe .ffe	2018
5	Support for incident wave polarisation angles: Polarisation Type Ellipticity Polarisation Angle	.tr	2018
5	Support for exporting characterised surface definitions to a .tr file.	.tr	2018
6	Support for Cartesian boundary coordinate system for aperture sources: Coordinate System Cartesian No. of [$$$] Samples U V	.ffe	2018.2
7	Support for exporting element power loss to a .epl file.	.epl	2019.1
7	Support for Cartesian boundary near field requests: Excluded Faces Key	.efe .hfe	2019.2
8	Support for antenna efficiency: Efficiency	.ffe	2020.1.1