1 WIDE BAND PATCH MICROSTRIP ANTENNA FOR WLAN & WIMAX APPLICATIONS J. Allami 1* , H. Ez-Zahraouy 1 , and H. Echab 1 1 Laboratoire de Matiere Condensee et Sciences Interdisciplinaries (LaMCScl), Department of Physics, Faculty of Sciences, Mohammed V University of Rabat, Morocco * jaouad.allami@gmail.com Abstract: In this paper, we propose a butterfly microstrip antenna with two rectangular openings in the front and two small openings on its sides as shown in Figure 1, with the characteristics of satisfactory radiation, the proposed antenna offers a 95% bandwidth covering the Zone band Wi-Fi/WiMAX, and the Frequency range acceptable for system (DCS 1.71-1.88 GHz), Personal Communications System (PCS 1.85-1.88 GHz) and IEEE 802. the built-in broadband microstrip patch antenna for different wireless applications was introduced then the proposed antenna measures were developed and the impedance bandwidth and radiation pattern were measured. The simulated and measured antenna characteristics were also presented along with the radiation and gain scheme, since the proposed design antenna could fully cover the required bandwidth for digital communication. 1. Introduction WLANs are frequently used all over the world. The IEEE 802.11b and IEEE 802.11g standards use the 2.4 GHz ISM range. The frequency range is free of license, so WLAN devices will experience interference from microwave ovens, wireless phones, blue tooth devices and other applications that use the same range. For this MSA application is the ideal choice due to its light weight, low definition, low cost and easy integration with microwave circuit, the standard rectangle microstrip antenna has a defect in narrowband bandwidth. Performance is improved by enhancing the bandwidth that is the main goal of the paper [1]. Reducing scale, bandwidth and profit enhancement are key challenges in designing microstrip antennas in order to meet the miniaturization of mobile phone units. Narrow bandwidth of printed microstrip patches is one of the most important limiting factors for large-scale applications. The traditional microstrip antenna can meet this requirement. Therefore, there is a need to enhance the bandwidth of microstrip antennas for broadband and multi-band applications [2]. Microstrip antennas (MSAs) are popular among researchers because of its attractive features such as low profile, low cost, light weight, ease of manufacturing and compatibility with microwave circuits [3], where despite these numerous advantages, microstrip antennas suffer from some narrow bandwidth limitations and low efficiency. Several studies have been conducted to increase the bandwidth of microstrip antennas, which include increased substrate thickness, use of low insulation antenna, cleft patch antennas, introduction of parasitic elements either in blocks or stacked configuration, and use of different matching and feeding impedance techniques [4]. Microstrip patch antennas are used in many applications because of their advantages over traditional antennas such as low profile, light weight, small size, compatibility with microwave integrated circuits (MIC) and mono microwave circuits [5]. The main drawback of a microstrip antenna is narrow bandwidth and low gains, some applications that need to increase bandwidth, have dual patch antenna is an alternative solution [6], where the Microstrip antenna consists of a thin metal connector that is attached to thin-film dielectric substrates. Minimizing the size of the microstrip patch is critical in many modern applications such as WiMAX, WLAN, (GPS) and other upcoming wireless terminals and the patch antennas play a very important role in today's world of wireless communication systems. In this paper we propose a microstip antenna in the service of Wi-Fi and WiMAX networks in high quality in order to develop modern wireless communication fields. Figure 1 represents simulators of the antenna and its various dimensions and aspects. Fig. 1. Proposed Antenna Mode 3D 2. Design Microstrip Antenna The proposed small antenna coordinates are as follows: L = 45 mm; W = 45 mm; L1 = 22.5 mm; L2 = 3 mm; L3 = 1.5 mm; L4 = 3 mm; L5= 1.5 mm; L6= 4 mm;