ISSN: 2277-9655 [Shital* et al., 6(12): December, 2017] Impact Factor: 4.116 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com © International Journal of Engineering Sciences & Research Technology [1] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY MICROSTRIP ANTENNA ARRAY WITHOUT AND WITH SQUARE EBG STRUCTURE Lahamge Shital *1 , Dhede Vaishali 2 * Electronics and Telecommunication,JCOE Kuran Pune,, India 1 , ASST.PROF. & HOD Electronics and Telecommunication,JCOE Kuran Pune,, India 2 DOI: 10.5281/zenodo.1084114 ABSTRACT The microstrip antenna is the most popular for low price and compact design. In this paper, a microstrip antenna (MSA) mounted over a high impedance electromagnetic bandgap (EBG) substrate using square structure, also presents a reduced size of microstrip antenna with Square EBG structure. The combination of the microstrip antenna fabricated on the top of the substrate FR4 with Electromagnetic Band Gap (EBG) structures at radiating edge of patch is proposed is and investigated. A half/quarter/sixth part of patch antenna with microstrip feed is designed as a reference antenna. First, the miniaturization is investigated by reducing the size of the reference antenna through. The high gain behavior with further miniaturization is achieved by using serial feed 4x1 patch array with square EBG technique. The antenna has been designed on FR4 substrate and thickness h=1.6 mm, and has a compact structure with a total size of 60x60mm square is 118.0 mm × 175.0 mm × 1.6 mm. The proposed antenna exhibits 80MHz impedance bandwidth from (2.45-2.53GHz) with around 8.3dB gain. The characteristics of antenna like return loss, VSWR, radiation pattern and gain of the proposed antenna are described and simulated with the help of HFSS. The measurement results are in close agreement with the simulation results. The proposed Square EBG antenna is compact, low profile, and offers very high gain required for long way Communication system. KEYWORDS: Microstrip patch, Antenna array, EBG structure, Square and Circle unit cell, WLAN band and half/quarter/eighth part of patch. I. INTRODUCTION The microstrip patch antenna has very important role in world of a wireless communication systems .There is always a large demand for high performance, low cost and small size wireless communication systems. In order to get all these requirements, a patch antenna is preferred because of its various advantages such as small size, low price, ease for fabrication and light weight. The multi-element smart antenna array has attracted attention of the researchers due to its wide range of applications in the field of wireless communication. Different multi- element antenna prototypes are designed and implemented for the applications in the base stations (BS) to improve the quality of transmission and enhance the cellular capacity, coverage and reliability [1-5]. On the other hand, recent advances in the study of the electromagnetic band gap (EBG) structures has established these structures to be simple solutions towards improving the antenna performance [6]. The performance improvement occurs due to the stop bands of these periodic structures. These structures provide a simple and effective solution to the problems of surface and leaky waves [7]. Several types of microstrip based EBG structures have been analysed for the variety of applications. These structures are studied by utilizing both finite difference time domain and finite element method techniques [8]. In this article, we propose a new analytical method based on transmission line theory to design the EBG of the microstrip patch antenna in particular to enhance its performance. We describe a serial feed 4x1 patch array antenna with EBG structure with wide impedance bandwidth and high gain. This structure has been further investigated and integrating regular circle and rectangle shaped EBG structure at edge of resonating patch and a significant improvement has been observed in both radiation pattern at the designed frequency.