• Which Products are you interested in ?

    CST offers a wide range of EM simulation software to address design challenges across the electromagnetic spectrum, from static and low frequency to microwave and RF, for a range of applications, including EDA & electronics, EMC & EMI and charged particle dynamics.

  • Antenna Magus
  • IdEM
  • FEST3D
  • Optenni Lab
  • Looking for a Training, Workshop or eSeminar ?

    CST STUDIO SUITE® is being demonstrated at trade shows and workshops all over the world. Take a look at the list of conferences and exhibitions CST will be attending and get further information regarding CST workshops, eSeminars and training days.

  • TrainingsRegular training courses are held in CST's offices in Asia, Europe, and North America. Please check our trainings section for detail of trainings in all over the globe. Advance registration is normally required.

  • WorkshopsCST hosts workshops in multiple languages and in countries around the world. Workshops provide an opportunity to learn about specific applications and refresh your skills with experienced CST support staff. Make sure you visit our workshop section.

  • eSeminarsThroughout the year, CST simulation experts present eSeminars on the applications, features and usage of our software. You can also view past eSeminars by searching our archive and filtering for the markets or industries that interest you most.

  • Check our latest Events
  • Why create a MyCST Account ?

    A MyCST account may facilitate your access to many of the offerings on the CST website, for example the registration for eSeminars and the watching of eSeminars recordings, setting email preferences, and there is more functionality to come. It is required to participate in workshops and trainings.

  • Personal PreferencesAllows you to update your email preferences and areas of interest. It helps us to personalize your experience.

  • EventsSearch for events by location, industry and application. Once you are registered, you will be able to manage your registrations and check important details about your events. This section also provides you with a repository for Workshop & Training material.

  • LibraryYou can collect articles you find on the CST website to reference or read later by clicking on the “Add this article” button at the bottom of the article page.

  • Create Your Own Account
  • Need technical Support ?

    Customers can customize their accounts once they have completed the account creation process. This platform acts as vivid interface between CST and our customers.

    We therefore offer access to the latest Service Packs (including an automatic notification that a new Service Pack is available), a steadily growing database of Frequently Asked Questions (FAQs), Application Notes and Training Videos, as well as an individual FTP section for easy exchange of large files with our support team.

  • Do I need an Account?To access the Support Site a valid maintenance contract and a one-time registration is required.

    Please note that your Support login does not work for the MyCST account.

  • Get Support
  • How to request a Trial License ?

    Get your license in only three steps:

    1. Fill in the required fields in the contact form on the right and click "Send Us Your Request".

    2. Lean back and wait until one of our CST Experts contacts you.

    3. Enjoy a our trial license.

  • Student Edition

    Student Edition The CST STUDIO SUITE® Student Edition has been developed with the aim of introducing you to the world of electromagnetic simulation, making Maxwell’s equations easier to understand than ever. With this edition you have, bar some restrictions, access to our powerful visualization engine and some of the most advanced solvers of CST STUDIO SUITE.

    Student Edition

CST – Computer Simulation Technology


Fest3D is a software tool capable of analyzing complex passive microwave components based on waveguide and coaxial cavity technology in very short computational times with high accuracy. This suite offers all the capabilities needed for the design of passive components such as optimization and tolerance analysis. Moreover, Fest3D advanced synthesis tools allow designing bandpass, dual-mode and lowpass filters from user specifications.

Fest3D is based on the integral equation technique efficiently solved by the Method of Moments. Additionally, the Boundary Integral-Resonant Mode Expansion (BI-RME) method is employed for extracting the modal chart of complex waveguides with arbitrary cross-section. The successful combination of such methods ensures a high degree of accuracy, as well as reduced computational resources (in terms of CPU time and memory) compared to mode-matching methods.

Fest3D is an optional part of CST Studio Suite® and is also available as a stand-alone offering.


Fest3D analysis method is based on a multimode equivalent network representation of waveguide junctions. Each element in the complete circuit is solved with the best available method, ensuring both efficiency and accuracy. On this basis, Fest3D is able to simulate complex passive devices in extremely short times (of the order of seconds or a few minutes), whereas general purpose software (based on segmentation techniques such as finite elements or finite differences) can take hours for the same calculations.

On top of that, unlike mode-matching techniques, the electromagnetic algorithms employed in Fest3D minimize the problems of relative convergence, leading to confident results. Furthermore, the integral equation technique employed extracts part of the frequency dependent computations, thus allowing a very low computational time per frequency point when compared to standard mode-matching techniques. This benefit is more evident when high accuracy is required and, therefore, a large amount of electromagnetic modes are required to analyze the component.

Fest3D AnalysisSome of the components that can be analysed with Fest3D are:

  • Filters (Comb-line, Inter-digital, waffle-iron, dual-mode, band-stop, etc.)
  • Multiplexers (Diplexers, OMUX’s, etc.)
  • Couplers
  • Polarizers
  • OMT’s

Fest3D includes the possibility to automatically design several types of components from user specifications. Currently, the user can synthesize dual-mode filters, band-pass filters, low-pass filters and rectangular tapers.

During the synthesis stage, full-wave simulations are performed in order to consider the impact of non-propagative waveguide modes. Thanks to this and to the particular algorithms employed in each case, the synthesis process provides very good responses with respect to the user specifications without the need for post-optimization.

As well as the automatic generative design of specific components, Fest3D has an optimization tool for the refinement of the component geometrical parameters in order to get the final desired response. Several optimization algorithms are included in the tool (Simplex, Powell and Gradient). The progress of the optimization can be monitored in real time, as well as stopped, reconfigured and resumed from the Graphical User Interface at any time.

Fest3D DesignFest3D also allows the user to easily perform sensitivity analysis of the final design. The user can choose which geometrical parameter/s to modify and the deviation of each one can be set separately. 

All Products

Antenna Magus CST Studio Suite Idem Spark3D Optenni Lab
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