2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

IEEE Transactions on Microwave Theory and Techniques
Volume 48 Number 10, October 2000

Table of Contents for this issue

Complete paper in PDF format

High-Performance Transitions for Overmoded Operation of Elliptical Waveguides

Uwe Rosenberg, Senior Member, IEEE and Martin Schneider

Page 1749.

Abstract:

Overmoded elliptical waveguide systems are shown to provide considerable lower insertion loss compared with standard types using the frequency band with exclusive TEc11 fundamental mode propagation. The considerations for the overmoded waveguide operation are outlined. A novel transition design based on transformer steps with curved cross sections and containing means for higher order mode control is established for interfacing the oversized elliptical cross section with the standard rectangular waveguide ports. The accurate determination of the transition structure maintaining high performance demands is obtained by a suitable computer-aided-design procedure. The overmoded waveguide approach, including the transition design, is proven by computed and experimental results for a millimeter-wave design.

References

  1. W. Krank and E. Schüttlöffel, "Trommelbarer Hohlleiter mit elliptischem Querschnitt für Höchstfrequenzen", Telefunken-Z., vol. 35, no.  136, pp.  112-116, June  1962.
  2. E. Kaffenberger and E. Schüttlöffel, "Ein trommelbarer Aluminum-Hohlleiter ovalen Querschnitts mit günstigen Wellenwiderstandstransformationen (ALFORM-Hohlleiter)", Frequenz, vol. 26, no. 9, pp.  252-258, 1972.
  3. S. E. Miller and A. C. Beck, "Low-loss waveguide transmission", Proc. IRE , vol. 41, pp.  348-358, Mar.  1953.
  4. D. A. Lanciani, "H01 mode low-loss waveguide transmission", in Proc. Millimeter Wave Res. Applicat. Conf., Oct. 1953, p.  45ff. 
  5. E. Kaffenberger, "Anschlussarmaturen für Flexwell-Hohlleiter", NTZ, vol. 3, pp.  146-151, 1971.
  6. H. D. Knetsch, "Beitrag zur Theorie sprunghafter Querschnittsveränderungen von Hohlleitern", AEU¨, vol. 22, no. 12, pp.  591-600, 1968 .
  7. M. Schneider and J. Marquardt, "Mode-matching method for the calculation of steps between rectangular and elliptical waveguides", AEÜ, vol. 50, no. 6, pp.  375-383, Nov.  1996.
  8. U. Banhardt, B. Birn, W. Hauth, R. Keller and G. Müller, "Low cost computer aided design of complex wavguide circuits", Frequenz, vol. 48, no. 11-12, pp.  249-257,  1994.
  9. F. Giese, J. M. Reiter and F. Arndt, "Modal analysis of arbitrarily shaped irises in waveguides by a hybrid contour-integral mode-matching method", in IEEE MTT-S Int. Microwave Symp. Dig., Orlando, FL, May 1995, pp.  1359-1362. 
  10. J. Marquardt and M. Schneider, "Waveguide circuits with nearly arbitrary cross-sections", in Proc. Int. Microwave Millimeter Wave Technol. Conf. , Beijing, China,Aug. 1998, pp.  557-560. 
  11. N. W. McLachlan, Theory and Application of Mathieu Functions, New York: Dover, 1964.
  12. M. Schneider, "Dispersions-und Dämpfungseigenschaften der eigenmoden periodisch gewellter Hohlleiter", Ph.D. dissertation, Univ. Hannover, Hannover, Germany, 1997.
  13. M. Schneider and J. Marquardt, "Fast computation of modified Mathieu functions applied to elliptical waveguide problems", IEEE Trans. Microwave Theory Tech., vol. 47, pp.  513-516, Apr.  1999.
  14. H.-J. Butterweck, "Mode filters for oversized rectangular waveguides", IEEE Trans. Microwave Theory Tech., vol. MTT-16, pp.  274-281, May  1968.
  15. J. Uher, J. Bornemann and U. Rosenberg, Waveguide Components for Antenna Feed Systems: Theory and CAD, Norwood, MA: Artech House, 1993.