volume | PIER Journals

Abstract

This paper investigates the electromagnetic coupling from various aperture shapes in aperture coupled suspended rectangular microstrip antennas. The proposed study involves various shapes of coupling aperture such as ``rectangle'', ``H'', ``bowtie'', and ``hourglass'' with a single-layer aperture coupled suspended rectangular microstrip antenna. Among the various shapes, ``hourglass'' shaped aperture yields maximum coupling leading to maximum bandwidth. For the validation aperture coupled suspended rectangular microstrip antenna with ``hourglass-shaped'' aperture is fabricated, and measurements were carried out. The measured fractional impedance bandwidth (FBW) with ``hourglass'' aperture is more than 30% at 1.06 GHz. Measured peak gain and front-to-back (F/B) ratio of aperture coupled suspended microstrip antenna with ``hourglass'' at 1.06 GHz are 8.5 dBi and greater than 11.2 dB, respectively. The influence on the antenna's performance parameters such as realized gain, impedance bandwidth, and F/B ratio due to metallic mounting surface is also investigated. The simulated and measured performances of the antenna are in agreement. The proposed investigation is very useful for various applications, when broadband antenna is mounted on a metallic body.

1. Pozar, D. M., "A review of aperture coupled microstrip antennas: History, operation, development, and applications,", 1-9, University of Massachusetts at Amherst, 1996. Google Scholar

2. Kumar, G. and K. P. Ray, Broadband Microstrip Antennas, Artech House, 2003.
doi:10.1049/el:19910705

3. Pozar, D. M. and S. D. Targonski, "Improved coupling for aperture coupled microstrip antennas," Electronics Letters, Vol. 27, No. 13, 1129-1131, 1991.
doi:10.1109/8.511831 Google Scholar

4. Rathi, V., G. Kumar, and K. P. Ray, "Improved coupling for aperture coupled microstrip antennas," IEEE Transactions on Antennas and Propagation, Vol. 44, No. 8, 1196-1198, 1996. Google Scholar

5. Jazi, M. N., Z. H. Firouzeh, H. Mirmohammad-Sadeghi, and G. Askari, "Design and implementation of aperture coupled microstrip IFF antenna," PIERS Proceedings, 198-202, Hangzhou, China, March 24-28, 2008. Google Scholar

6. Aijaz, Z. and S. C. Shrivastava, "An introduction of aperture coupled microstrip slot antenna," International Journal of Engineering Science and Technology, Vol. 2, No. 1, 36-39, 2010. Google Scholar

7. Aijaz, Z. and S. C. Shrivastava, "Effect of the different shapes: Aperture coupled microstrip slot antenna," International Journal of Electronics Engineering, Vol. 2, No. 1, 103-105, 2010. Google Scholar

8. Aijaz, Z. and S. C. Shrivastava, "Coupling effects of aperture coupled microstrip antenna," International Journal of Engineering Trends and Technology, Vol. 20, No. 11, 2011. Google Scholar

9. Rathod, J. M., "Comparative study of microstrip patch antenna for wireless communication application," International Journal of Innovation, Management and Technology, Vol. 1, No. 2, 194-197, 2010. Google Scholar

10. Singh, M., A. Basu, and S. K. Koul, "Design of aperture coupled fed micro-strip patch antenna for wireless communication," 2006 Annual IEEE India Conference, IEEE, 2006. Google Scholar

11. Kharade, S. A., S. V. Khobragade, and A. Bagwari, "An aperture coupled microstrip patch antenna for application at 7.5 GHz," International Journal of Engineering Research & Technology (IJERT), Vol. 8, No. 7, July 2019. Google Scholar

12. Jiang, H. and K. Cho, "Novel broadband aperture-coupled patch antenna using bow-tie shaped slot," Proc. ISAP 2006, Session D, 2006.
doi:10.1016/j.ijin.2020.11.002 Google Scholar

13. Anandkumar, D. and R. G. Sangeetha, "Design and analysis of aperture coupled micro strip patch antenna for radar applications," International Journal of Intelligent Networks, Vol. 1, 141-147, 2020.
doi:10.2528/PIERB08072603 Google Scholar

14. Ghassemi, N., J. Rashed-Mohassel, M. H. Neshati, S. Tavakoli, and M. Ghassemi, "A high gain dual stacked aperture coupled microstrip antenna for wideband applications," Progress In Electromagnetics Research B, Vol. 9, 127-135, 2008. Google Scholar

15. Rahim, M. K. A., et al. "Aperture coupled microstrip antenna with different feed sizes and aperture positions," 2006 International RF and Microwave Conference, IEEE, 2006. Google Scholar

Mr. Mahendra Prasad Yadav

Dr. Rajesh Kumar Singh

Professor Kamla Prasan Ray