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Examples
The Feko Example Guide contains a collection of examples that teaches you Feko concepts and essentials.
User Interface Tools
Simple examples demonstrating using Feko application automation, matching circuit generation with Optenni Lab and optimising a bandpass filter with HyperStudy.
Matching Circuits Generation with Optenni Lab
Design matching antenna circuits with Optenni Lab and use the circuit in Feko.
Using Existing S-Parameter Data
This example shows how to use S-parameters with the Optenni Lab: Port Matching application macro. The S-parameters was requested with a S-parameter Configuration configuration.
Matching the Antennas with Optenni Lab
Use Optenni Lab to match the antennas. Use the application macro Optenni Lab: Port matching.

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.
- Example Summary
  View a summary of the examples in the Feko Example Guide.
- Antenna Synthesis and Analysis
  Simple examples demonstrating antenna synthesis and analysis.
- Antenna Placement
  Simple examples demonstrating antenna placement.
- Radar Cross Section (RCS)
  Simple examples demonstrating radar cross section (RCS) calculations of objects.
- EMC Analysis and Cable Coupling
  Simple examples demonstrating electromagnetic compatibility (EMC) analysis and cable coupling.
- Waveguide and Microwave Circuits
  Simple examples demonstrating using waveguides and microwave circuits.
- Bio Electromagnetics
  Simple examples demonstrating phantom and tissue exposure analsysis.
- Time Domain
  A simple example demonstrating the time analysis of an incident plane wave on an obstacle.
- Special Solution Methods
  Simple examples demonstrating using continuous frequency range, using the MLFMM for large models, using the LE-PO (large element physical optics) on subparts of the model and optimising the waveguide pin feed location.
- User Interface Tools
  Simple examples demonstrating using Feko application automation, matching circuit generation with Optenni Lab and optimising a bandpass filter with HyperStudy.
  - Introduction to Application Automation
    Use application automation to perform operations with CADFEKO and POSTFEKO. Typical tasks include repetitive tasks, tasks that require several steps, or calculations.
  - Automatic Report Generation Using API
    Increase productivity when dealing with predictable and repeatable POSTFEKO sessions (for example, exporting a report) using application automation. Use an automation script to configure a session and export a report that highlights the antenna properties of the model.
  - Using Altair HyperStudy with Feko to Optimise a Bandpass Filter
    Design a bandpass coupled line filter with Altair HyperStudy as optimisation engine and Feko as the computational solver.
  - Matching Circuits Generation with Optenni Lab
    Design matching antenna circuits with Optenni Lab and use the circuit in Feko.
    - Using Existing S-Parameter Data
      This example shows how to use S-parameters with the Optenni Lab: Port Matching application macro. The S-parameters was requested with a S-parameter Configuration configuration.
      - Importing the Model
        Import the model from the .dxf file. Create surfaces from the imported model outline.
      - Defining Calculation Requests
        Define the calculation requests in CADFEKO.
      - Completing the Model
        Complete the model construction in CADFEKO.
      - Modifying the Auto-Generated Mesh
        Modify the model mesh in CADFEKO using the correct settings. A mesh is a discretised representation of a geometry model or mesh model used for simulation in the Solver.
      - Validating the Model
        Run the computational electromagnetic (CEM) validate tool to perform basic validation on the CADFEKO model.
      - Running the Feko Solver
        Run the Solver to compute the calculation requests.
      - Obtaining the Dual Antenna Unmatched S-Parameters
        Solve the dual PIFA antenna and obtain the unmatched S-parameters.
      - Matching the Antennas with Optenni Lab
        Use Optenni Lab to match the antennas. Use the application macro Optenni Lab: Port matching.
    - Including Additional Far Field Data
      This example shows how to use the Optenni Lab: Port Matching application macro to transfer far field data to Optenni Lab. The radiation pattern data is then considered when designing matching networks with Optenni Lab.
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.

Matching the Antennas with Optenni Lab

Use Optenni Lab to match the antennas. Use the application macro Optenni Lab: Port matching.

These examples are also available as tutorials¹ in the Optenni Lab installation. The different matching options are also provided in Optenni Lab.

From the Application macro menu, select Optenni Lab: Port matching. This launches the Select run mode dialog.

Figure 1. Options for running the Feko-Optenni Lab link.

Note: If the first run mode is selected, a new .cfx file is created and the unmatched S-parameter simulation is executed.
Select Use existing data for the current model and click Next.
This sends the Touchstone results to Optenni Lab to design the matching circuit.
Generate the matching circuit by following the steps in the Optenni Lab tutorials and documentation.

Figure 2. Single band antenna matching network (Optenni Lab) and general network (CADFEKO).

Figure 3. Dual antenna matching network (Optenni Lab) and general network (CADFEKO).
Right-click in the circuit view and select Transfer circuit to Feko and quit.
A new .cfx file is created automatically when the matching circuit is added as a general network.
Run Feko to obtain the matched antenna S-parameter.

Figure 4. S-parameters for the matched single antenna.

Figure 5. S-parameters for the matched dual antenna.

¹ The single antenna model corresponds to Optenni Lab Basic Tutorial A and the dual antenna model refers to Optenni Lab Multiantenna Tutorial B.