Vol-4 Issue-2 2018 IJARIIE-ISSN(O)-2395-4396 7564 www.ijariie.com 403 Printed Antenna for Wireless Applications Operating in ISM band D.Selvaraj 1 , D.Arulkumar 2 , D.Dhinakaran 3 1 Professor, Electronics and Communication Engg., Panimalar Engineering College, Tamilnadu, India 2 Assistant Professor(G-I), Electronics and Commn., Engg., Panimalar Institute of Technology, TN, India 3 Assistant Professor, Computer Science and Engg., Peri Institute of Technology, Tamilnadu, India ABSTRACT A compact hexagonal antenna for wireless communication is proposed in this paper. The antenna resonates at 2.45 GHz (ISM) band. The antenna has an overall dimension of only 7.6cm X 5.8cm which shows a good size reduction compared to antennas operating in the WLAN band. The simple design, feeding, and compactness make it easy to be integrated in circuit boards, handheld devices . The simulated output shows that the antenna has a good directivity, gain and bandwidth of 255MHz. The return loss is also is very good. it is around -30 to -40 dB. Keyword : - Hexagonal Antenna, ISM band, Microstrip patch 1. INTRODUCTION Emerging technology has paved the way for device miniaturization in turn, has led to the need for miniaturization of antennas suitable for these modern devices used in personal communication equipment. Compact antennas are also required for applications such as missiles and other airborne applications where space is limited. The microstrip antennas have recently attracted a lot of attention due to the growing demand for compact antennas for personal communication equipment. It has been shown that loading a rectangular, circular or triangular microstrip patch antenna with a shorting pin can effectively reduce the size of the patch required for a given operating frequency [l- 3]. Compact Rectangular, circular and triangular microstrip antennas have already been reported in the literature [5, 6]. A shorted Hexagonal microstrip antenna (HMSA) has however, not been investigated as thoroughly as shorted patch antennas of other shapes. A Hexagonal Microstrip Antenna (HMSA) has the advantage that its shape/area can be closely approximated to that of a circle and it can be packed closely together in an array. Also, straight edge of HMSA configuration helps in parasitic coupling with other similar patches for bandwidth improvement which would have become difficult with curved edges of circular microstrip patch antenna. Recently, HMSA and its variations have been reported in the literature and a resonance frequency formulation has been proposed to match with the experimental results [7 – 12]. A single HMSA has been designed, fabricated, simulated and measured results are presented in the next section. The conventional HMSA has also been designed and fabricated and the results for these variations of HMSA have been compared. In [12], a compact configuration of Hexagonal microstrip antenna using multi shorting has been proposed. The area has been shown to reduce by a factor of four for the quarter patch using multi shorting techniques, while maintaining approximately the same resonance frequency as that of conventional HMSA. In this paper, a single shorting pin has been used to reduce the resonance frequency of a given size of hexagonal microstrip patch antenna. The reduction in area for an antenna designed at a given operating frequency using this technique is seen to be almost 10 times as compared to a conventional HMSA 2. ANTENNA DESIGN PARAMETRS The antenna design parameter equations and its values are given in equations (1) to (5) and Table1. Initially rectangular patch is designed for the ISM band frequency and a hexagonal is formed as shown in figure 1. Along the