Fest3D

Microwave Filter Design Software

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 compared to mode-matching methods.

CST Studio Suite Fest3D is a software tool capable of analyzing complex passive microwave components based on waveguide and cavity technology in very short computational times with high accuracy. The main objective of this software tool is to support the microwave component design/manufacturing industries to decrease both the time to market and the development costs for the next generation of communication systems.

Key Features Fest3D

Fast & Accurate This software is based on a modal approach in which the device is divided into different blocks connected through the electromagnetic modes at the interface. Thanks to this divide-and-conquer approach, and to the use of unique algorithms, Fest3D ensures a high degree of accuracy while reducing the need of computational resources.
Versatile In order to cope with complex 2D and 3D building blocks, Fest3D uses an efficient e lectromagnetic n umerical method—the Boundary Integral-Resonant Mode Expansion (BI-RME)—which is able to provide a broadband analysis efficiently. In addition to this, and thanks to the integration of the High Frequency solver (based on Finite Elements) of CST Studio Suite, Fest3D is capable of simulating most of the components in waveguide and/or cavity technology.
Integration into CST Studio Suite This solver is available within the CST Studio Suite schematic. This allows the creation of large structures combining CST Studio Suite and Fest3D projects. In addition, Fest3D can use most of the features in CST Studio Suite such as optimization through the coupling matrix for filter d esign, p arameter s weeps, e tc. ( by u sing t he FD3D software tool).

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Analysis

The 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 traditional mode-matching techniques, the electromagnetic algorithms employed in Fest3D minimize the problems of relative convergence, leading to confidence in the results. Furthermore, the employed integral equation technique extracts part of the frequency dependent computations, resulting in 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 is required to analyze the component.

Some of the components that can be analyzed with Fest3D are:

Filters (Comb-line, Inter-digital, waffle-iron, dual-mode, band-stop, etc.)

Multiplexers (Diplexers, OMUXs, etc.)

Couplers

Polarizers

OMTs

Design

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-propagating 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.

In addition to the automatic design generation of specific components, Fest3D has an optimization tool for the refinement of the component’s 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.

With Fest3D users can easily perform sensitivity analysis of the final design. They can choose which geometrical parameter/s to modify and the deviation of each one can be set separately.

Microwave Filter Design Software

Key Features Fest3D

Types of licenses

Product Suite

Additional Resources

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Analysis

Design

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