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Investigation of a circular TE11-TE01-mode converter in stepped waveguide technique

Published online by Cambridge University Press:  10 April 2015

Christian Schulz ,
Christoph Baer ,
Thomas Musch ,
Ilona Rolfes  and
Bianca Will
Christian Schulz*
Affiliation:
Institute of Microwave Systems, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany
Christoph Baer
Affiliation:
Institute of Electronic Circuits, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany
Thomas Musch
Affiliation:
Institute of Electronic Circuits, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany
Ilona Rolfes
Affiliation:
Institute of Microwave Systems, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany
Bianca Will
Affiliation:
Department of Engineering and Economics, South Westphalia University of Applied Sciences, Lindenstr. 53, 59872 Meschede, Germany
*
Corresponding author: C. Schulz E-mail: christian.schulz-hfs@rub.de
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Abstract

A compact and broadband TE11-TE01-mode converter, suitable for various industrial applications like bypass level measurements, is presented in this contribution. Based on stepped waveguide technique, the main advantages of the recommended converter design and the specific field distribution of the TE01-mode are discussed in detail. The converter is presented exemplary for a frequency range from 23 to 28 GHz, which corresponds to a bandwidth of approximately 20 % of the center frequency. Numerous three-dimensional electromagnetic field simulations are performed to optimize the converter and to investigate its reflection and transmission behavior. Realized by six different single elements and 11 parts in total, fast and effective simulations can be performed with CST Microwave Studio. Considering realistic production process parameters, like fillets or tolerances, a good return loss better 17 dB, an insertion loss of 0.1 dB, and an excellent mode purity are achieved. Compared with back-to-back, realistic disturber scenario, and far-field measurements with a first prototype, the expected excellent converter behavior can be validated without limitations. Hence, the suitability of the presented converter design is proven and the feasibility is demonstrated.

Keywords

ModelingSimulation and characterizations of devices and circuitsRadar applications
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Special Issue 3-4: European Microwave Week 2014 , June 2015 , pp. 229 - 237
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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