PIER
 
Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 114 > pp. 235-254

LOW-FREQUENCY EXCITATION OF LEAKY MODES IN A MICROSTRIP LINE WITH A TOP COVER

By J. Bernal Mendez, F. Mesa, and D. R. Jackson

Full Article PDF (775 KB)

Abstract:
This paper studies the excitation of a physical leaky mode in a covered microstrip structure at low frequencies. We calculate the current excited in the line by a delta-gap voltage source via a full wave analysis based on a mixed potential integral equation scheme. The current in the line is decomposed into its bound mode and continuous spectrum components. The bound mode component is associated with the propagation effects whereas the continuous spectrum component is associated with reactive and/or radiative effects and contains the contribution of the leaky mode. Our analysis also includes a detail study of the dispersion relations of the bound and leaky modes along with their corresponding electric fields. At low frequencies, in the covered microstrip structure with a low top cover height, we have found that the bound mode role is superseded by the leaky mode, in the sense that it is the leaky mode which partially or totally carries the signal energy. Therefore, the spurious effects associated with the excitation of a leaky mode, which usually appear at high frequencies in open microstrip lines, appear here in the low frequency range. This effect may have very relevant practical consequences in the performance of such systems.

Citation:
J. Bernal Mendez, F. Mesa, and D. R. Jackson, "Low-Frequency Excitation of Leaky Modes in a Microstrip Line with a Top Cover," Progress In Electromagnetics Research, Vol. 114, 235-254, 2011.
doi:10.2528/PIER11012511
http://www.jpier.org/PIER/pier.php?paper=11012511

References:
1. Achar, R. and M. S. Nakhla, "Simulation of high-speed interconnects," Proceedings of the IEEE, Vol. 89, No. 5, 693-728, May 2001.
doi:10.1109/5.929650

2. Gholami, M. and M. Niroo Jazi, "Implementation of a low loss microstrip to waveguide transition in X-band using CAD Methods," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 8-9, 1133-1141, 2009.

3. Wang, N. B., Y. C. Jiao, Y. Song, L. Zhang, and F. S. Zhang, "A microstrip-fed logarithmically tapered slot antenna for wideband applications," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 10, 1335-1344, 2009.
doi:10.1163/156939309789108543

4. Wang, J., J. Ni, S. Zhao, and Y.-X. Guo, "Compact microstrip ring branch-line coupler with harmonic suppression," Journal of Electromagnetic Waves and Applications,, Vol. 23, No. 16, 2119-2126, 2009.
doi:10.1163/156939309790109216

5. Rebenaque, D. C., J. P. Garcıa, F. Q. Pereira, J. L. G. Tornero, and A. A. Melcon, "Novel implementation of transversal filters in multilayered microstrip technology," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 8-9, 1241-1253, 2010.
doi:10.1163/156939310791586179

6. Vazquez Antuna, C., G. Hotopan, S. Ver Hoeye, M. Fernandez Garcia, L. F. Herran, and F. Las Heras Andres, "Microstrip antenna design based on stacked patches for reconfigurable two dimensional planar array topologies," Progress In Electromagnetics Research, Vol. 97, 95-104, 2009.
doi:10.2528/PIER09072107

7. Alkanhal, M. A. S., "Composite compact triple-band microstrip antennas," Progress In Electromagnetics Research, Vol. 93, 221-236, 2009.
doi:10.2528/PIER09050407

8. Razalli, M. S., A. Ismail, M. A. Mahdi, and M. N. bin Hamidon, "Novel compact “via-Less” ultra-wide band filter utilizing capacitive microstrip patch ," Progress In Electromagnetics Research, Vol. 91, 213-227, 2009.
doi:10.2528/PIER09020403

9. Marques, R. and F. Mesa, "Spectral domain analysis of higher order leaky modes in microstrip lines: A new spectral-gap effect," Journal of Electromagnetic Waves and Applications, Vol. 11, No. 10, 1367-1384, 1997.
doi:10.1163/156939397X00044

10. McMillan, L. O., N. V. Shuley, and P. W. Davis, "Leaky fields on microstrip," Progress In Electromagnetics Research, Vol. 17, 323-337, 1997.
doi:10.2528/PIER97032700

11. Di Nallo, C., F. Mesa, and D. R. Jackson, "Excitation of leaky modes on multilayer stripline structures," IEEE Trans. Microwave Theory and Tech., Vol. 46, No. 8, 1062-1071, Aug. 1998.
doi:10.1109/22.704947

12. Jackson, D. R., F. Mesa, M. J. Freire, D. P. Nyquist, and C. Di Nallo, "An excitation theory for bound modes, leaky modes, and residual-wave currents on stripline structures," Radio Science, Vol. 35, No. 2, 495-510, Mar.–Apr. 2000.
doi:10.1029/1999RS900076

13. Oliner, A. A. and Radio Science, "Leakage from higher modes on microstrip line with application to antennas,", Vol. 22, 907-912, Nov. 1987.

14. Machac, J., J. Hruska, and J. Zehentner, "Slotline leaky wave antenna with a stacked substrate," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 12, 1587-1596, 2007.
doi:10.1163/156939306779292309

15. Gomez-Tornero, J. L., G. Goussetis, and A. Alvarez-Melcon, "Correction of dielectric losses in practical leaky-wave antenna designs," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 8, 1025-1036, 2007.

16. Oskouei, H. D., K. Forooraghi, and M. Hakkak, "Guided and leaky wave characteristics of periodic defected ground structures," Progress In Electromagnetics Research, Vol. 73, 15-27, 2007.
doi:10.2528/PIER07031701

17. Mahmoudian, A. and K. Forooragi, "A novel planar leaky wave antenna for wireless application," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 2-3, 313-324, 2008.
doi:10.1163/156939308784160640

18. Liu, C.-Y., Q.-X. Chu, and J.-Q. Huang, "Efficient approach for sensitivity analysis of lossy and leaky structures using FDTD," Progress In Electromagnetics Research, Vol. 19, 93-102, 2010.

19. Liu, C.-Y., Q.-X. Chu, and J.-Q. Huang, "A planar D-CRLH and its application to bandstop filter and leaky-wave antenna," Progress In Electromagnetics Research Letters, Vol. 19, 93-102, 2010.

20. Liu, C.-Y., Q.-X. Chu, and J.-Q. Huang, "Double-side radiating leaky-wave antenna based on composite right/left-handed," Progress In Electromagnetics Research Letters, Vol. 14, 11-19, 2010.

21. Abdelaziz, A. F., T.M. Abuelfadl, and O. L. Elsayed, "Leaky wave antenna realization by composite right/left-handed transmission line," Progress In Electromagnetics Research Letters, Vol. 11, 39-46, 2009.
doi:10.2528/PIERL09080901

22. Pozar, D. M., Microwave Engineering, 2nd edition, Wiley, New York, 1998.

23. Bahl, I. and P. Bhartia, Microwave Solid State Circuit Design, 2nd edition, Wiley, New York, 2003.

24. Nghiem, D., J. T. Williams, D. R. Jackson, and A. A. Oliner, "Leakage of the dominant mode on stripline with a small air gap," IEEE Trans. Microwave Theory Tech., Vol. 43, No. 11, 2549-2556, Nov. 1995.
doi:10.1109/22.473177

25. Oliner , A. A. and Package effects caused by leaky modes at higher frequencies in microwave integrated circuits, "Package effects caused by leaky modes at higher frequencies in microwave integrated circuits ," Proc. 29th Europen Microwave Conf., Germany, Oct. 4–8, 1999.

26. Mesa, F., A. A. Oliner, D. R. Jackson, and M. J. Freire, "The influence of a top cover on the leakage from microstrip line," IEEE Trans. Microwave Theory and Tech., Vol. 48, No. 12, 2240-2248, Dec. 2000.
doi:10.1109/22.898970

27. Michalski, K. A. and D. Zheng, "Electromagnetic scattering and radiation by surfaces of arbitrary shape in layered media, Part I: Theory ," IEEE Trans. Antennas Propagat., Vol. 38, 335-344, Mar. 1990.
doi:10.1109/8.52240

28. Michalski, K. A. and J. R. Mosig, "Multilayered media Green’s functions in integral equation formulations," IEEE Trans. Antennas Propagat., Vol. 45, 508-519, Mar. 1997.
doi:10.1109/8.558666

29. Yla-Oijala, P., M. Taskinen, and J. Sarvas, "Multilayered media Green’s functions for MPIE with general electric and magnetic sources by the Hertz potential approach," Progress In Electromagnetics Research, Vol. 33, 141-165, 2001.
doi:10.2528/PIER00120802

30. Essid, C., M. B. B. Salah, K. Kochlef, A. Samet, and A. B. kouki, "Spatial-spectral formulation of method of moment for rigorous analysis of microstrip structures," Progress In Electromagnetics Research Letters, Vol. 6, 17-26, 2009.
doi:10.2528/PIERL08112706


© Copyright 2014 EMW Publishing. All Rights Reserved