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    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
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    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.

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  • 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.

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    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.

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  • 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".

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    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

Microfabricated Planar Helical Slow-Wave Structures Based on Straight-Edge Connections for THz Vacuum Electron Devices
Ciersiang Chua, Sheel Aditya, Julius M. Tsai , Min Tang, Zhongxiang Shen
Terahertz Science and Technology
Volume: 4, Issue: 4, December 2011
Electron devices, Interaction impedance, Phase velocity, Planar helix, Ring-bar, Slow-wave structure, Traveling-wave tube
This paper reports on two planar helical slow-wave structures that offer wide bandwidth and a good potential for microfabrication. The paper begins with a review of progress made in recent years in the development of a planar helix slow-wave structure with straight-edge connections (PH-SEC). This is followed by new results that compare the performance of the PH-SEC with that of the circular and rectangular tape helices; specially considered is the interaction impedance for the forward- and backward-wave. The focus of the rest and the major part of the paper is a new slow-wave structure, namely, the rectangular ring-bar with straight-edge connections (RRB-SEC). It is shown that, similar to the case of the circular ring-bar structure, the RRB-SEC enhances the interaction impedance for the fundamental forward-wave while reducing the interaction impedance for the backward-wave. Detailed results for phase velocity and interaction impedance of the RRB-SEC are presented to show the effect of structure dimensions. Two configurations which are suitable for microfabrication of the RRB-SEC on a silicon wafer are also presented. As a proof-of-concept, one of these configurations, designed for operation at W-band, is microfabricated. The fabricated structures include a coplanar waveguide feed. On-wafer cold-test S-parameter measurements are reported for frequencies from 80 to 110 GHz. The measured results match well with the simulation results when the effect of surface roughness of the different parts of the fabricated structures is accounted for in the simulations. The RRB-SEC, with rectangular or square cross section, has potential application in high frequency travelling-wave tubes that aim to achieve high power operation.

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