Home
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.
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).

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.
  - 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).
    - S-Parameter Coupling in a Stepped Waveguide Section (MoM)
      Calculate the transmission and reflection for the waveguide with the method of moments. Use waveguide ports for the sources.
    - S-Parameter Coupling in a Stepped Waveguide Section (FEM)
      Calculate the transmission and reflection through the waveguide with the finite element method. Use FEM modal ports for the source.
    - Viewing the Results
      View and post-process the results in POSTFEKO.
    - Refining the Mesh with AMRFEKO
      Obtain a computationally efficient mesh with AMRFEKO. Start with a coarse mesh and let AMRFEKO automatically refine the mesh.
  - 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).
- 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.

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).

The waveguide consists of a Ku-band section and an X-band section. Only the H₁₀ mode with cutoff frequency, $f_{c} = \frac{c_{0}}{2 a} = 9.4871$ GHz is considered.

The Ku-band section dimensions are as follows:

a = 15.8 mm
b = 7.9 mm

The X-band section dimensions are as follows:

a = 22.9 mm
b = 10.2 mm

Calculate S-parameters from the cutoff frequency to 15 GHz.

Figure 1. 3D view of the waveguide step.

Tip: Find the completed models in the application macro library¹.

¹ The application macro library is located on the Home tab, in the Scripting group. Click the Application Macro icon and from the drop-down list, select Example Guide.