Progress In Electromagnetics Research B
ISSN: 1937-6472
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 8 > pp. 77-86


By M. Ansarizadeh, A. Ghorbani, and R. A. Abd-Alhameed

Full Article PDF (225 KB)

Computation of the broadband matching potential of a microstrip antenna requires the wideband lumped equivalent circuit of the antenna. The general topology of the equivalent circuit of rectangular microstrip patch antennas has been used to model the feedpoint impedance of microstrip antennas over a wide frequency band and equivalent circuit parameters are determined using optimization techniques. The proposed procedure overcomes the problems of physical realizability of the equivalent circuit and estimation of the starting values of the optimization. Applying this technique, wideband lumped equivalent circuits of a rectangular and E-shaped microstrip antenna have been computed which are in good agreement with measurement data from 0.1 to 6 GHz.

M. Ansarizadeh, A. Ghorbani, and R. A. Abd-Alhameed, "An Approach to Equivalent Circuit Modeling of Rectangular Microstrip Antennas," Progress In Electromagnetics Research B, Vol. 8, 77-86, 2008.

1. Ghorbani, A. and R. A. Abd-Alhameed, "An approach for calculating the limiting bandwidth — Reflection coefficient product for microstrip patch antennas," IEEE Trans. Antennas Propag., Vol. 54, No. 4, 1328-1331, Apr. 2006.

2. Ghorbani, A. and M. A. Ansarizadeh, "The bode-fano integrals as an objective measure of antenna bandwidth reflection coefficient product limit ," 2006 International RF and Microwave Conference Proceedings, Putrajaya, Malaysia, Sept. 12–14, 2006.

3. Zhu, L. and Y. Qi, "A novel approach to evaluating the gainbandwidth potential of antennas," Antennas and Propagation SocietyInternational Symposium, AP-S. Digest, Vol. 3, 2058-2061, Jul. 1996.

4. Gustafsson, M. and S. Nordebo, "Bandwidth, Q factor, and resonance models of antennas," Progress In Electromagnetics Research, Vol. 62, 1-20, 2006.

5. Fano, R. M., "Theoretical limitations on the broadband matching of arbitrary impedances," J. Franklin Institution, Vol. 249, 57-83, 139–155, Jan./Feb. 1950.

6. Youla, D. C., "A new theory of broadband matching ," IEEE Trans. on Circuit Theory, Vol. 11, 30-50, Mar. 1964.

7. Khalaj-Amirhosseini, M., "Wideband or multiband complex impedance matching using microstrip nonuniform transmission lines," Progress In Electromagnetics Research, Vol. 66, 15-25, 2006.

8. Liu, S.-F., X.-W. Shi, and S.-D. Liu, "Study on the impedancematching technique for high-temperature superconducting microstrip antennas ," Progress In Electromagnetics Research, Vol. 77, 281-284, 2007.

9. Abdelaziz, A. A., "Bandwidth enhancement of microstrip antenna," Progress In Electromagnetics Research, Vol. 63, 311-317, 2006.

10. Abboud, F., "Simple model for the input impedance of coax-fed rectangular microstrip patch antenna for CAD," IEE Proceedings, Vol. 135, Pt. H, No. 5, Oct. 1988.

11. Kajfez, D., "Deembedding of lossy foster networks," IEEE Trans. Antennas Propag., Vol. 53, No. 10, 1328-1331, Oct. 2005.

12. Kim, Y. and H. Ling, "Equivalent circuit modeling of broadband antennas using a rational function approximation," Microwave and Optical Technology Letters, Vol. 48, No. 5, 950-953, May 2006.

13. Wang, Y., J. Li, and L.-X. Ran, "An equivalent circuit modeling method for ultra-wideband antennas," Progress In Electromagnetics Research, Vol. 82, 433-445, 2008.

14. Yarman, B. S., A. Kilinc, and A. Aksen, "Immitance data modelling via linear interpolation techniques: A classical circuit theory approach," International Journal of Circuit Theory and Applications, Vol. 32, 537-563, 2004.

15. Richards, W., "An improved theory for microstrip patches," IEE Proc., Vol. 132, Pt. H, 93-98, 1985.

16. Yang, F., X.-Z. Zhang, and Y. R. Samii, "Wideband E-shaped patch antennas for wireless communications," IEEE Trans. Antennas Propagat., Vol. 49, No. 7, Jul. 2001.

17. Ang, B.-K. and B.-K. Chung, "A wideband E-shaped microstrip patch antenna for 5–6 GHz wireless communications," Progress In Electromagnetics Research, Vol. 75, 397-407, 2007.

18. Ansari, J. A. and R. B. Ram, "E-shaped patch symmetrically loaded with tunnel diodes for frequency agile/broadband operation ," Progress In Electromagnetics Research B, Vol. 1, 29-42, 2008.

19. Jolani, F., A. M. Dadgarpour, and H. R. Hassani, "Compact Mslot folded patch antenna for WLAN," Progress In Electromagnetics Research Letters, Vol. 3, 35-42, 2008.

20. Sadat, S., M. Fardis, F. G. Kharakhili, and G. Dadashzadeh, "A compact microstrip square-ring slot antenna for UWBA applications," Progress In Electromagnetics Research, Vol. 67, 173-179, 2007.

21. Khodae, G. F., J. Nourinia, and C. Ghobadi, "A practical miniaturized U-slot patch antenna with enhanced bandwidth ," Progress In Electromagnetics Research B, Vol. 3, 47-62, 2008.

22. Sadat, S., M. Houshmand, and M. Roshandel, "Design of a microstrip square-ring slot antenna filled by an H-shape slot for UWB applications," Progress In Electromagnetics Research, Vol. 70, 191-198, 2007.

23. Alkanhal, M. A. S. and A. F. Sheta, "A novel dual-band reconfigurable square-ring microstrip antenna," Progress In Electromagnetics Research, Vol. 70, 337-349, 2007.

© Copyright 2010 EMW Publishing. All Rights Reserved