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 2, February 2000

Table of Contents for this issue

Complete paper in PDF format

CAD Models for Asymmetrical, Elliptical, Cylindrical, and Elliptical Cone Coplanar Strip Lines

Zhengwei Du, Ke Gong, Jeffrey S. Fu, Zhenghe Feng and Baoxin Gao

Page 312.

Abstract:

By the conformal mapping method, we give analytical closed form expressions for the quasi-TEM parameters for asymmetrical coplanar strip lines (ACPS's) with finite boundary substrate. Then, based on the analysis of ACPS's, elliptical coplanar strip lines (ECPS's) and cylindrical coplanar strip lines (CCPS's), and elliptical cone coplanar strip lines (ECCPS's) are studied. Computer-aided-design oriented analytical closed-form expressions for the quasi-TEM parameters for ACPS's, ECPS's, CCPS's, and ECCPS's are obtained. All of the expressions are simple and accurate for microwave circuits' designs and are useful for transmission-line theory and antenna theory. The reasonableness of the method and results are verified and various design curves are given.

References

  1. I. Kneppo and J. Gotzman, "Basic parameters of nonsymmetrical coplanar lines", IEEE Trans. Microwave Theory Tech., vol. MTT-25, pp. - 718, Aug.  1977.
  2. S. S. Gevorgian, "Asymmetric coplanar-strip transmission lines for MMIC and integrated optic applications", Electron. Lett., vol. 26, no. 22, pp.  1916-1917, 1990.
  3. S. S. Bedair, "Characteristics of some asymmetrical coupled transmission lines", IEEE Trans. Microwave Theory Tech., vol. MTT-32 , pp.  108-110, Jan.  1984.
  4. C. P. Wen, "Coplanar waveguide: A surface strip transmission lines suitable for nonreciprocal gyromagnetic device", IEEE Trans. Microwave Theory Tech., vol. MTT-17, pp.  1087-1090 , June  1969.
  5. C. Veyres and V. F. Hanna, "Extension of the application of conformal mapping techniques to coplanar lines with finite dimensions", Int. J. Electron. , vol. 48, no. 1, pp.  47-56, Jan.  1980.
  6. V. F. Hanna, "Finite boundary corrections to coplanar stripline analysis", Electron. Lett., vol. 16, no. 15, pp.  604-606, 1980 .
  7. S. S. Gevorgian, "Basic characteristics of two layered substrate coplanar waveguides", Electron. Lett., vol. 30, no. 15, pp.  1236-1237, 1994.
  8. E. Chen and S. Y. Chou, "Characteristics of coplanar transmission lines on multilayers substrates: Modeling and experiments", IEEE Trans. Microwave Theory Tech., vol. 45, pp.  939-945 , June  1997.
  9. Z. Du and C. Ruan, "Basic parameters of asymmetrical coplanar striplines with finite substrate thickness", (in Chinese), J. Electron., vol. 20, no. 6, pp.  828-834, Nov.   1998.
  10. Z. Du, J. S. Fu and K. Gong, "Basic parameters of asymmetrical coplanar striplines with multilayer substrates and overlays", Int. J. Infrared Millim. Waves, vol. 20, no. 2, pp.  351-356, Feb.  1999.
  11. L.-R. Zeng and Y. Wang, "Accurate solutions of elliptical and cylindrical striplines and microstrip lines", IEEE Trans. Microwave Theory Tech., vol. MTT-34, pp.  259-265, Feb.  1986.
  12. W. Lin, Chinese Lin Weigan's Selected Works in Microwave Field Theory and Application Study , (in Chinese), Beijing : China: Publication House Electron. Ind., 1989 , pp.  180- 183. 
  13. N. Yuan, C. Ruan and W. Lin, "The characteristic impedance of the stripline and microstrip line of the elliptic cone", Microwave Opt. Technol. Lett., vol. 5, no. 10, pp.  506-509, Sept.  1992.
  14. V. Zargari and T. C. Rao, "Characteristic impedance of a tubular dielectric cylinder covered with conducting arc strips", IEEE Trans. Microwave Theory Tech., vol. 37, pp.  1645-1647 , Oct.  1989.
  15. C. Karpuz, A. Gorür and M. Alkan, "Quasistatic analysis of cylindrical coplanar strip lines", Microwave Opt. Technol. Lett., vol. 17, no.  2, pp.  148-151, Feb.  1998.
  16. W. Hilberg, "From approximations to exact relations for characteristic impedance", IEEE Trans. Microwave Theory Tech., vol. MTT-17 , pp.  259-265, May  1969.