Full Paper Int. J. on Recent Trends in Engineering and Technology, Vol. 8, No. 2, Jan 2013 © 2013 ACEEE DOI: 01.IJRTET.8.2. 537 Design of Series Feed Microstrip Patch Antenna Array using HFSS Simulator Anamika Srivastava, Vivek Sharma, Richa Sharma Department Of Electronics And Communication Engineering Ajay Kumar Garg Engineering College, Ghaziabad. srivastavaanamika@hotmail.com,vivek_sharma212002@yahoo.co.in,richa.sharma70@gmail.com Abstract- In this paper series feed Micro strip Patch Antenna Array are designed and analyzed for WLAN application, which operating at S-band frequency Range of 2.4 GHz. Antenna arrays are used to achieve higher gain. Larger the number of antenna elements, better the gain of antenna array would be achieved. In this paper feeding element and matching line is used to design the 4 X 1 micro strip patch antenna array. Micro strip line feed and matching line are used to design series Micro strip patch antenna array. The measured radiation pattern and Return loss of 4X1 elements antenna array are presented. An-soft HFSS simulator is used. Index Terms: Micro strip antenna array I. INTRODUCTION Antennas are the basic component of any electric system and are connecting links between the transmitter and receiver. Thus antennas play very important role in finding the characteristics of the system in which antenna are employed. Antennas are employed in different systems in the different forms [1]. The antennas are used simply to radiate electromagnetic energy in an omnidirectional or finally in some systems for point to point communication purposes in which increased gain and reduced wave interference are required. In spacecraft or aircraft applications, where size, weight, cost, performance, ease of installation, low profile antennas are required. In order to meet these specifications Micro strip Patch antennas are used [2]. An Antenna is an electrical device which converts electric current into radio waves and vice-versa. It is usually used with radio transmitter or radio receiver. In transmission, a radio transmitter applies an oscillating radio frequency electric current to the antenna terminals and the antenna radiates the energy from the current as electromagnetic wave. In reception, antenna intercepts some of the power of electromagnetic wave in order to produce a tiny voltage at its terminals that is applied to a receiver to be amplified. An antenna can be used for both transmitting and receiving. An antenna is a device that converts a signal transmitted from a source to a transmission line into electromagnetic waves and that is used to broadcast into free space and vice versa. An antenna is concentrating the radiation energy in some directions and to suppress it in the other directions at certain frequencies. An antenna must me tuned to the same frequency band of the radio system to which it is connected; otherwise the reception and the transmission will be impaired. A good antenna design can improve overall performance of the system which is depending on the physical size [3]. Micro strip patch antenna is popular for low profile applications at frequencies above 100 MHz. Micro strips Antenna is used in wireless communications, satellite communications, and radar, due to low profile, low weight, and low cost, easy fabrication into arrays [4]. The major disadvantage of micro strip antennas are their inefficiency and very narrow frequency bandwidth which is typically only a fraction of percent or few percent, limited power capacity and tolerance problem. To overcome the bandwidth limitation, number of antenna elements or feeding matching networks may be employed in order to satisfy the bandwidth requirement for the particular application. Antennas play an important role in today’s wireless communication. Without the use of antenna, signals are not able to be transmitted out or received. While designing an antenna, we must consider the important characteristics of the antenna which are defined as: Radiation Pattern Radiation Intensity Directive gain or Directivity Efficiency Operating frequencies Power Gain In this paper, a 4 element high gain micro strip antenna array by feeding network at S-band is presented. The simulation of the proposed antenna has been carried out using Ansoft HFSS software. II. MICROSTRIP PATCH ANTENNA DESIGN A. 1antenna Array Architecture A patch antenna is a narrowband, wide-beam antenna fabricated by etching the antenna element pattern in metal trace bonded to an insulating dielectric substrate, such as a printed circuit board, with a continuous metal layer bonded to the opposite side of the substrate which forms a ground plane. Common micro strip antenna shapes are square, rect- angular, circular and elliptical, but generally rectangular and circular are most commonly used. Some patch antennas do not use a dielectric substrate and instead made of a metal patch mounted above a ground plane using dielectric spac- ers; the resulting structure is less rugged but has a wider bandwidth. Because such antennas have a very low profile, are mechanically rugged and can be shaped to con 62