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Examples
The Feko Example Guide contains a collection of examples that teaches you Feko concepts and essentials.
Waveguide and Microwave Circuits
Simple examples demonstrating using waveguides and microwave circuits.
Microstrip Coupler
Calculate the S-parameters (coupling) of a four port microstrip coupler. Use the finite difference time domain (FDTD).
Viewing the Results
View and post-process the results in POSTFEKO.

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.
- 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.
  - Microstrip Filter
    Calculate the S-parameters of a simple microstrip notch filter. Use different solvers and compare the results.
  - S-Parameter Coupling in a Stepped Waveguide Section
    Calculate the transmission and reflection for a stepped waveguide transition from the Ku- to X-band. Use two solver methods, the method of moments (utilising waveguide ports) and the finite element method (utilising FEM modal ports).
  - Using a Non-radiating Network to Match a Dipole Antenna
    Match a short dipole for resonance at 1.4 GHz with an LC matching section. The matched network is modelled using a Spice circuit and S-parameters.
  - Subdividing a Model Using Non-Radiating Networks
    Calculate the input impedance of a circularly polarised patch antenna fed through a microstrip branch coupler. Replace the branch coupler with a non-radiating network and compare with a full solution.
  - Microstrip Coupler
    Calculate the S-parameters (coupling) of a four port microstrip coupler. Use the finite difference time domain (FDTD).
    - Creating the Model
      Create the model in CADFEKO. Define any ports and sources required for the model. Specify the operating frequency or frequency range for the model.
    - Defining Calculation Requests
      Define the calculation requests in CADFEKO.
    - Running the Feko Solver
      Run the Solver to compute the calculation requests.
    - Viewing the Results
      View and post-process the results in POSTFEKO.
- 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 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.

Viewing the Results

View and post-process the results in POSTFEKO.

Plot the magnitude of S₂₁, S₃₁ and S₄₁ (in dB) on a Cartesian graph.

Figure 1. S₂₁, S₃₁ and S₄₁ of the microstrip coupler.

Compare the results with the literature reference, On the design of planar microwave components using multilayer structures”, by W. Schwab and W. Menzel, IEEE Trans. MTT, vol. 40, no. 1, Jan 1992, pp. 67-72, Fig 9.

Note: The measured data from the referenced article are in good agreement with the simulated results. Any differences are most likely due to uncertainties regarding the model dimensions or dielectric properties.