Research Article | ![]()
Design and Improvement of a Modified Patch Antenna of Microstrip with an Integrated Filter and L-Shaped Slot for ISM-Band Applications
Author(s): Elaf Falah Hussein1*, Israa Hazem Ali2
Published In : International Journal of Electrical and Electronics Research (IJEER) Volume 14, Issue 1
Publisher : FOREX Publication
Published : 15 June 2026
e-ISSN : 2347-470X
Page(s) : 263-270
Abstract
The microstrip antennas are often used in the wireless communications due to their size and the ease with which they can be made. Nonetheless, their performance is greatly affected by modifications in engineering and physical properties. So, the simple microstrip antenna was designed in this research and the analysis of the most important variables was conducted. This involves modification of the substrate thickness, feed width, type of insulating material and ground level parameters. The experiment involved the study on its influence on bandwidth, antenna gain, and impedance matching within the 2.4 GHz ISM frequency range. The simulation was done via CST software along with the FR-4 insulating material was 1.6 mm thick. Various configurations were experimented to come up with the most appropriate parameter settings. On the basis of these findings, A novel antenna design is created that encompasses an L-shaped aperture as well as a filter in order to enhance radiation efficiency, undesirable out of band responses as well as enhancement of impedance behavior. It was demonstrated in the simulation that the patch dimensions could be altered to bring about an optimal value of the antenna performance as the frequency of operation was 2.4 GHz resulting in a standing wave voltage ratio (VSWR) of 1.178, a directivity of 6.6 dBi, a bandwidth of 96.3 MHz, a realized gain of 2.484 dBi and a reflection coefficient (S11) of =-21.729 dB. Due to these results, the proposed antenna becomes an appropriate choice in the case of the ISM-band, Wi-Fi, and Internet of Things wireless networks.
Keywords: Patch Antenna, Slots, Filter, ISM, Directivity, Gain.
Elaf Falah Hussein, Department of Communications, College of Engineering, University of Diyala, Diyala, Iraq; Email: eng_grad_communication2503@uodiyala.edu.iq
Israa Hazem Ali, Department of Communications, College of Engineering, University of Diyala, Diyala, Iraq; Email: israa_hassan_eng@uodiyala.edu.iq
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[1] W. Elias, “Antenna Evolution: Enabling Seamless Connectivity in the Cloud Computing and AI Automation Landscape,” International Journal of Advanced Engineering Technologies and Innovations, vol. 1, no. 2, 2023.
-
[2] J. D. Kraus and R. J. Marhefka, Antennas for All Applications, 3rd ed. New York, NY, USA: McGraw-Hill, 2002.
-
[3] S. Pathak and S. K. Singh, “Microstrip Patch Antenna: A Review and the Current State of the Art,” International Research Journal of Engineering and Technology (IRJET) vol. 8, no. 6, June 2021.
-
[4] M. S. Rana, B. K. Sen, M. T.-A. Mamun, S. I. Sheikh, M. S. Mahmud, and M. M. Rahman, “Design of S-band microstrip patch antenna for wireless communication systems operating at 2.45GHz,” in 2022 13th International Conference on Computing Communication and Networking Technologies (ICCCNT), IEEE, Oct. 2022, pp. 1–6. doi: 10.1109/ICCCNT54827.2022.9984490.
-
[5] K. K. Giri, R. K. Singh, and K. Mamta, “Effect of symmetric shaped slot on patch antenna design and performance for 10 GHz 5G Applications,” Journal of Scientific Research, vol. 14, no. 2, pp. 405–417, May 2022, doi: 10.3329/jsr.v14i2.55209.
-
[6] S. O. Zakariyya, V. O. Omolẹ, M. A. Gbadamosi, A. J. Adesina, A. A. Yeketi, and B. O. Sadiq, “Design, simulation and analysis of a microstrip patch antenna at 2.45 GHz frequency for wireless application,” Selcuk University Journal of Engineering Sciences, vol. 24, no. 1, pp. 11–17, Apr. 2025.
-
[7] A. S. R. Mhiripiri, “Optimization of a rectangular microstrip patch antenna for 2.4 GHz ISM band operation,” International Journal on Science and Technology (IJSAT), e-ISSN: 2229-7677.
-
[8] C. Saetiaw, J. Nakorntep, V. Chamnannphrai, and S. Lamultree, “Design of a star-shaped patch antenna with a half-elliptical ground plane using copper thin film and PLA substrate”, vol. 48, no. 2025, Jun. 2025, doi: 10.15199/48.2025.06.15.
-
[9] T. Shravya Sree, A. Venkatesh, V. Vamshi, and P. Annapurna, “Design of a microstrip circular patch antenna at 2.4 GHz using HFSS for WLAN application,” International Journal of Innovative Research in Technology (IJIRT), vol. 11, no. 7, Dec. 2024, ISSN: 2349-6002.
-
[10] R. G. Aulia, “Design of a 2.4 GHz microstrip patch antenna for WiFi communication using CST Studio Suite 2019,” Dept. of Telecommunication Engineering, Politeknik Negeri Padang, Padang, West Sumatera, Indonesia, 2019.
-
[11] M. F. Zambak, S. S. Al-Bawri, M. Jusoh, A. H. Rambe, H. Vettikaladi, A. M. Albishi, and M. Himdi, “A compact 2.4 GHz L-shaped microstrip patch antenna for ISM-band Internet of Things (IoT) applications,” Electronics, vol. 12, no. 9, p. 2149, May 2023, doi: 10.3390/electronics12092149.
-
[12] A. Mohan and N. Kumar, “An ultra-wideband compact meander line antenna for brain implants and biotelemetry applications in the 2.45 GHz ISM band,” Results in Engineering, vol. 24, Art. no. 103345, 2024.
-
[13] Md. A. Rahman, A. Shaikat, I. S. Iqbal, and A. Hassan, “Microstrip Patch Antenna Design and Performance Analysis for RFID Applications at ISM Band (2.45 GHz),”in Proc. 2nd Int. Conf. Advances in Electrical Engineering (ICAEE), Dhaka, Bangladesh, Dec. 2013, pp. 1–4.
-
[14] R. Khatun, M. Rahman, and A. Z. M. T. Islam, “Design of a compact rectangular microstrip patch antenna for 2.45 GHz ISM band,” SSRG International Journal of Recent Engineering Science, vol. 8, no. 3, pp. 30–35, May–Jun. 2021, doi: 10.14445/23497157/IJRES-V8I3P105.
-
[15] A. N. Muhi, M. Ghanim, and M. Q. Algburi, “A Compact S-Shaped Patch Antenna for ISM-Band Wireless Communications Applications,” International Journal of Electrical and Electronics Research (IJEER), vol. 13, no. 3, pp. 477–485, Aug. 2025.
-
[16] Y. Gmih, Y. El Hachimi, E. M. Makroum, and A. Farchi, “Design of a Miniaturized Patch Antenna with Reverse U-Shaped Slots for 2.45/5.8 GHz RFID Applications,” International Journal of Engineering Research & Technology (IJERT), vol. 5, no. 11, pp. 242–?, Nov. 2016.

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