Indonesian Journal of Electrical Engineering and Computer Science Vol. 32, No. 2, November 2023, pp. 828~837 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v32.i2.pp828-837  828 Journal homepage: http://ijeecs.iaescore.com A 3.5 GHz microstrip patch antenna design and analysis for wireless applications Md. Sohel Rana 1,2,3 , Md. Naheen Khurshid 1 , Sanjay Kumar Joy 1 , Md. Soriful Islam Sourav 1 , Md. Jakaria Hassan 1 , Md. Jubaer Nazmul 1 1 Department of Electrical and Electronic Engineering, Northern University of Business and Technology Khulna, Khulna, Bangladesh 2 Department of Computer Science and Engineering, Bangladesh University of Professionals, Mirpur, Bangladesh 3 Department of Electrical and Electronic Engineering, Independent University, Bangladesh (IUB), Dhaka, Bangladesh Article Info ABSTRACT Article history: Received Apr 6, 2023 Revised Jul 3, 2023 Accepted Aug 19, 2023 The design, simulation, and analysis of a 3.5 GHz rectangular microstrip patch antenna (RMPA) have been carried out for this research article. The substrate material employed for the design is a lossy form of FR-4, which has a thickness of 0.5 mm, a dielectric permittivity of 4.3, and a loss tangent of 0.0005, respectively. The antenna receives power through a feeding line with an impedance of 50 Ω. The simulation was ultimately finished off with the help of some computer simulation tools. Following completion of the simulation, the findings revealed a directivity gain of 6.05 dBi, a voltage standing wave ratio (VSWR) of 1.0607, and a bandwidth of 144.1 MHz. The return loss was determined to be -30.611 dB. The suggested antenna's primary purpose was to attain a standard value for the VSWR while lowering the return loss. This antenna improves directivity gain and bandwidth and has applications in radars, mobile phones, and wireless local area networks (WLANs). The results of this proposed antenna were superior to those of a variety of studies that had been published in the past. Keywords: FR-4 (lossy) Mobile phones Rectangular microstrip patch antenna Return loss Voltage standing wave ratio Wireless local area networks This is an open access article under the CC BY-SA license. Corresponding Author: Md. Sohel Rana Department of Electrical and Electronic Engineering Northern University of Business and Technology Khulna Khulna-9100, Bangladesh Email: sohel.rana@uits.edu.bd 1. INTRODUCTION People increasingly use phones, tablets, laptops, global positioning system (GPS), radio navigators, and other wireless handheld devices. This has led to tremendous technological advances in modern communication. They are connected to other wireless access points so that data and information can be exchanged across the wireless channels without any disturbance. When it comes to the technical operation of this communication, an antenna plays a crucial role at both the transmission and receiving ends. This is true for both ends of the transmission. Because many people use these communication tools, there is a pressing need for small antennas that still work well despite being smaller. Over the past two to three decades, the microstrip patch antenna (MPA) has become a good choice for these wireless communication systems because it can fit any shape, doesn't cost much to make, is light, and is easy to make using printed circuits. It has good qualities, like being light and easy to make printed circuit boards [1]. The radiating patch and the ground plane of a microstrip patch antenna are mounted on opposite sides of a dielectric substrate. The radiating patch is mounted on one side of the substrate, and the ground plane is mounted on the other. The patch is often made from a conductive material such as copper or gold, and its shape can be moulded into anything imaginable. The capacity of wireless technology has been expanding at