volume | PIER Journals

Abstract

In this work a new method based on the adaptive neuro-fuzzy inference system (ANFIS) was successfully introduced to determine the characteristic parameters, effective permittivities and characteristic impedances, of conventional coplanar waveguides. The ANFIS has the advantages of expert knowledge of fuzzy inference system and learning capability of neural networks. A hybrid-learning algorithm, which combines least-square method and backpropagation algorithm, is used to identify the parameters of ANFIS. There are very good agreement between the results of ANFIS models, experimental works, conformal mapping technique, spectral domain approach and a commercial electromagnetic simulator, MMICTL.

1. Ghione, G. and C. U. Naldi, "Coplanar waveguides for MMIC applications: Effect of upper shielding, conductor backing, finite-extent ground planes and line-to-line coupling," IEEE Transactions on Microwave Theory and Techniques, Vol. 35, 260-266, 1987.
doi:10.1109/TMTT.1987.1133637

2. Carlsson, E. and S. Gevorgian, "Conformal mapping of the field and charge distributions in multilayered substrate CPWs," IEEE Transactions on Microwave Theory and Techniques, Vol. 47, 1544-1552, 1999.
doi:10.1109/22.780407

3. Bedair, S. S. and I. Wolff, "Fast, accurate and simple approximate analysis formulas for calculating the parameters of supported coplanar waveguides for (M)MIC’s," IEEE Transactions on Microwave Theory and Techniques, Vol. 40, 41-48, 1992.
doi:10.1109/22.108321

4. Gevorgian, S. S., "Basic characteristics of two layered substrate coplanar waveguides," Electron. Letters, Vol. 30, 1236-1237, 1994.
doi:10.1049/el:19940861

5. Wen, C. P., "Coplanar waveguide: A surface strip transmission line suitable for nonreciprocal gyromagnetic device applications," IEEE Transactions on Microwave Theory and Techniques, Vol. 17, 1087-1090, 1969.
doi:10.1109/TMTT.1969.1127105

6. Chen, E. and S. Y. Chou, "Characteristics of coplanar transmission lines on multilayer substrates," IEEE Transactions on Microwave Theory and Techniques, Vol. 45, 939-945, 1997.
doi:10.1109/22.588606

7. Cheng, K. K. M. and I. D. Robertson, "Numerically efficient spectral domain approach to the quasi-TEM analysis of supported coplanar waveguide structures: Modeling and experiments," IEEE Transactions on Microwave Theory and Techniques, Vol. 42, 1958-1965, 1994.
doi:10.1109/22.320780

8. Shigesawa, H. and M. Tsuji, "Conductor-backed slot line and coplanar waveguide: Dangers and full-wave analysis," IEEE MTT-S Dig., 199-202, 1988.

9. Aksun, M. I. and H. Morkoc, "GaAs on Si as a substrate for microwave and millimeter-wave monolithic integration," IEEE Transactions Microwave Theory Techniques, Vol. 36, 160-163, 1988.
doi:10.1109/22.3500

10. Knorr, J. B. and K. D. Kuchler, "Analysis of coupled slots and coplanar strips on dielectric substrate," IEEE Transactions on Microwave Theory and Techniques, Vol. 23, 541-548, 1975.
doi:10.1109/TMTT.1975.1128624

11. Davies, J. B. and D. M. Syahkal, "Spectral domain solution of arbitrary coplanar transmission lines with multilayer substrate," IEEE Transactions on Microwave Theory and Techniques, Vol. 25, 143-149, 1977.
doi:10.1109/22.76444

12. Chang, C. N., W. C. Chang, and C. H. Chen, "Full-wave analysis of multilayer coplanar lines," IEEE Transactions on Microwave Theory and Techniques, Vol. 39, 747-750, 1991.

13. Schroeder, W. and I. Wolff, "Full-wave analysis of the influence of conductor shape and structure details on losses in coplanar waveguide," Microwave Symposium Digest, IEEE MTT-S International, Vol. 3, 1273-1276, 1995.

14. Jansen, R., "Hybrid mode analysis of end effects of planar microwave and millimeter wave transmission line," IEE Proceedings, Part H-Microwaves, Optics and Antennas, Vol. 128, 77-86, 1981.
doi:10.1109/TMTT.1969.1126946

15. Hilberg, W., "From approximations to exact relations for characteristic impedances," IEEE Transactions on Microwave Theory and Techniques, Vol. 17, 259-265, 1969.
doi:10.1109/21.256541

16. Jang, J.-S. R., "ANFIS: Adaptive-network-based fuzzy inference system," IEEE Trans Systems Man and Cybernetics, Vol. 23, 665-685, 1993.

17. Jang, J.-S. R., C.T. Sun, and E. Mizutani, Neuro-Fuzzy and Soft Computing: A Computational Approach to Learning and Machine Intelligence, Prentice-Hall, 1997.

18. Brown, M. and C. Haris, Neuro-Fuzzy Adaptive Modeling and Control, Prentice-Hall, 1994.

19. Constantin, V. A., Fuzzy Logic and Neuro-Fuzzy Applications Explained, Prentice-Hall, 1995.

20. Lin, C. T. and C. S. G. Lee, Neural Fuzzy Systems: A Neuro-Fuzzy Synergism to Intelligent Systems, Prentice-Hall, 1996.
doi:10.1163/156939304322749599

21. Guney, K. and N. Sarikaya, "Adaptive neuro-fuzzy inference system for the input resistance computation of rectangular microstrip antennas with thin and thick substrates," Journal of Electromagnetic Waves and Applications, Vol. 18, 23-39, 2004.
doi:10.1109/LMWC.2005.863245

22. Rahouyi, E. B., J. Hinojosa, and J. Garrigos, "Neuro-fuzzy inference modeling techniques for microwave components," IEEE Microwave and Wireless Components Letters, Vol. 16, 72-74, 2006.

23. AC Microwave’s MMICTL in Linmic Interconnect, Version 3, www.linmic.com, 2006.
doi:10.1049/el:19730261

24. Dupuis, P. A. J. and C. K. Campbell, "Characteristic impedance of surface-strip coplanar waveguides," Electron. Letters, Vol. 9, 354-355, 1973.
doi:10.1049/el:19790065

25. Becker, J. P. and D. Jager, "Electrical properties of coplanar transmission lines on lossless and lossy substrate," Electron. Letters, Vol. 15, 88-90, 1979.

26. Riad, A. A., S. M. Riad, M. Ahmad, F. W. Stephenson, and R. A. Ecker, "Thick-film coplanar strip and slot lines for microwave and wideband integrated circuits," Int. Microelectronics Symp. Dig., 8-21, Reno, Nevada, November 15-17 1982.

Prof. Mustafa Turkmen

Dr. Sabri Kaya

Dr. Celal Yildiz

Professor Kerim Guney