Skip to main content Accessibility help

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

  • Christian Schulz (a1), Christoph Baer (a2), Thomas Musch (a2), Ilona Rolfes (a1) and Bianca Will (a3)...


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.


Corresponding author

Corresponding author: C. Schulz E-mail:


Hide All
[1] McDermott, D.B. et al. : Design of a W-band TE01 mode gyrotron traveling-wave amplifier with high power and broad-band capabilities. IEEE Trans. Plasma Sci., 30 (2002), 894902.
[2] Kinder, R.L. and Kushner, M.J.: TE01 excitation of electron cyclotron resonance plasma source. IEEE Trans. Plasma Sci., 27 (1999), 6465.
[3] Pohl, N.; Gerding, M.; Will, B.; Musch, T.; Hausner, J. and Schiek, B.: High precision radar distance measurements in overmoded circular waveguides. IEEE Trans. Microw. Theory Tech., 55 (2007), 13741381.
[4] Vogt, M.: An optimized float for reliable radar tank level measurement in bypass pipes, in Microwave Conf. (GeMIC), 2014 German, March 2014, 1–4.
[5] Schulz, C.; Will, B.; Rolfes, I.; Pohl, N.; Baer, C. and Musch, T.: Characterization of a beam steering lens antenna for industrial radar measurements in harsh environments, in 2013 European Radar Conf. (EuRAD), October 2013, 117–120.
[6] Gerding, M.; Musch, T.; and Schiek, B.: A novel approach for a high-precision multitargetlevel measurement system based on time-domain reflectometry. IEEE Trans. Microw. Theory Tech., 54 (2006), 27682773.
[7] Matheson, K.; Ronald, K.; Speirs, D.; Phelps, A. and Cross, A.: An X-band rectangular TE10 to circular TE01 marie converter, in 2nd Annual Passive RF and Microwave Components Seminar, March 2011, 65–66.
[8] Krill, J. and Zinger, W.: Multiport rectangular TE10 to circular TE01 mode transducer having pyrimidal shaped transducing means, December 9 1986, US Patent 4,628,287.
[9] Davies, J.; Davies, O.J. and Saad, S.S.: Computer design of efficient TE01 circular waveguide transducers, in 4th European Microwave Conf., 1974, September 1974, 382–384.
[10] Yu, C.-F.; Chang, T.-H.: High-performance circular TE01-mode converter. IEEE Trans. Microw. Theory Tech., 53 (12) (2005), 37943798.
[11] Schulz, C.; Rolfes, I. and Will, B.: A broadband circular TE11- to TE01-mode converter using stepped waveguide technique, in 44th European Microwave Conf. (EuMC), 2014, October 2014.
[12] Daniel, E. et al. : Packaging of microwave integrated circuits operating beyond 100 GHz, in 2002, in Proc. IEEE Lester Eastman Conf. on High Performance Devices, August 2002, 374–383.
[13] Bruneau, P.; Janzen, H. and Ward, J.: Machining of Terahertz split-block waveguides with micrometer precision, in Infrared, Millimeter and Terahertz Waves, 2008., in 33rd Int. Conf. on IRMMW-THz 2008, September 2008, 1–2.
[14] Pozar, D.: Microwave Engineering, New York: John Wiley & Sons, Inc., 2004.



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed