International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-4, November 2019 6442 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number: D5155118419/2019©BEIESP DOI:10.35940/ijrte.D5155.118419 Abstract: In this paper, simulation and optimization analysis on circular patch antenna for 2.4GHz is presented. The performance that been specifically focused in this analysis is the improvement of the directivity and gain of the circular patch antenna design. Basically, the objective of this analysis is to compare the circular patch antenna of a single form with 1x2 antenna array formation. These antennas are designed with the proximity feeding technique. From the previous literature and findings, the optimization works of array arrangement have been proven will improve the directivity and gain performances. In this study, the array arrangement with proximity feeding technique of optimization work to improve the directivity and gain of a circular patch antenna has been explored. Comparison of a single and array of micro strip circular patch with proximity feeding technique as the FR-4 is the substrates with permittivity equal to 3.95 is presented. Based on the results, 1x2 array arrangements enhance the directivity and gain output compared to a single form circular patch antenna design. The directivity performance improves 28% and gain has been improved by 47% after optimization. The findings show that the array elements with proximity feeding technique design offer to improve and enhance the directivity and gain performances of an antenna. Keywords: Antenna array, gain, optimization. I. INTRODUCTION Today, there are several optimization methods that have been studied by many researchers in order to improve and enhance the performances in micro strip patch antenna design. There are several points of performance enhancement of fundamental parameters of an antenna that studies and analyzed by researchers. For the micro strip patch antenna that suffers from limited gain characteristics, narrow bandwidth, and low in gain. According to [1], l these weak points in micro strip patch antenna has been improved by several methods which are fix with various shapes, halfway substrate expulsion method, utilizing Meta material spread, and exhibit arrangement procedure. Directivity is one of the parameters that focused on to be optimized. According to Balanis [2], directivity is the proportion of the radiation force in a provided guidance from the antenna to the radiation power found the middle value of overall headings. Directivity parameter is paired with the total Revised Manuscript Received on November 19, 2019 Saidatul Hamidah Abd Hamid, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia. Goh Chin Hock, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia. Nayla Ferdous, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia. antenna efficiency and gain. the gain of the antenna is firmly identified with the directivity while the total antenna effectiveness is utilized to consider losses at the receiver and inside the structure of the antenna. According to the previous study and findings from researchers in the fields, regarding the optimization of directivity performance, referring to [3], this paper discussed the directivity enhancement techniques. As it stated that the directivity can be expanded by utilizing the micros trip antenna cluster structure yet this again build the size. Therefore the directivity of the micro strip antenna is expanded by somewhat growing the components of the fixed antenna and multilayer structure with verified dielectric. Another research study regarding the high directivity of the micro strip patch antenna. In this journal [4], a different Double Negative (DNG) been implemented to enhance the performance of a micro strip patch antenna. The outcomes indicate that this method has enhanced performance as far as directivity, gain, and radiation efficiency of the antenna. The directivity is improved from 6.878dBi to 7.184dBi. The efficiency of an antenna is amplified from 72% to 80.42%. The gain of the antenna is also enhanced from 5.454dB to 6.237dB. Next, in [5], this paper was examined on the directivity of micro strip fix antenna with twofold layer superstrate. Two dielectric superstrate layers, each a quarter wavelength in thickness and isolated by an air opening, are presented over the micro strip fix, isolated by another air distance. The parameters of these layers are utilized as key controllers of the directivity improvement. Gain enhancement has been discussed in [1] as they investigated the improvement of addition utilizing exhibit design and utilizing rectangular shape micro strip fix antenna. The objectives of the study are to design a single circular shape patch antenna and 1x2 arrays circular shape patch antenna, simulates the design with CST software tools at the operational frequency of 2.4GHz and analyze the directivity and gain performance of both design. The effectiveness of the array configuration technique is the main focus of this analysis. The other performance-related such as return loss S 11 , VSWR, Radiation efficiency and total efficiency of these antennas also been discussed. II. RESEARCH METHODOLOGY 1. Identification of Project Requirement. 1.1 Proposed Antenna Design In designing a micro strip patch antenna, four parts need Optimization of Directivity and Gain Performances on Circular Patch Antenna Design for 2.4 GHz Applications Saidatul Hamidah Abd Hamid, Goh Chin Hock, Nayla Ferdous