Design of a Split P-shaped Multiband Microstrip Patch antenna for Modern Communication System Md. Jubaer Alam 1 , Mohammad Rashed Iqbal Faruque 1* , and Md. Moinul Islam 2 1 Institute of Space Science (ANGKASA), UKM, 43600 Bangi, Selangor, Malaysia 2 Department of Software Engineering, Faculty of Science and Information Technology, DIU, Dhaka-1207 Abstract— A fictional design of a compact microstrip patch antenna for multiband frequency has been depicted in this paper. The proposed design presents a slit P-shaped antenna that operates at 3.5 GHz, 5.9 GHz, 9.2 GHz and 13.1 GHz. FR-4 (lossy) is used as substrate to design the recommended antenna which has a firm dimension of 18 x 20 mm 2 . This antenna operates at S, C, X and Ku band with moderate bandwidth because of its design and feedline. This P-shaped multiband antenna has directive gain of 3.3dBi, 4.9 dBi, 6.5 dBi and 7.1 dBi at resonating frequencies and is suitable for a modern communication system. Regarding this antenna, the results are obtained in terms of Return Loss, Voltage Standing Wave ratio, Gain and Radiation Pattern which have admissible values of return loss less than -10 dB, VSWR less than 2 at each resonant frequencies and Gain more than 3 dB. Keywords— Multiband; Split Microstrip Antenna; Return Loss; VSWR; Directivity I. INTRODUCTION In the current 21 st century, a revolutionary change has been seen in the field of wireless communications. Thus the design of antenna has come to deal with this wireless application. Microstrip antennas are one of those designs that covered a huge portion of the wireless system such as Bluetooth, Wi-Fi, WLAN, WiMax applications. In early 1970’s microstrip antenna was introduced and it had become a great revolution in the field of antenna design. Thus the importance of Microstrip Patch Antenna (MPA) had been realized. MPAs are known as low profile antennas. They are comfortable to use in planar and nonplanar surfaces. They are being used widely because they are simple and inexpensive to fabricate. These MPAs have a popular frequencies range of above 100 MHz (Prasad, 2011). These patch antennas are actually fabricated on a dielectric substrate. The advantage of having this conformable structure is to integrate into various telecommunication systems. Here the most important part between two elements is the sensible choice of spacing. A coupling problem occurs with the reduction of the structure. As a result, performance decreases. Sometimes, increased spacing brings up the uncertain convexity [2-8]. In this paper, we designed a split P-shaped MPA that produces multiple bands resonating at 3.5 GHz, 5.9 GHz, 9.2 GHz, and 13.1 GHz with excellent return loss. The frequencies that we are getting the proposed antenna cover L, C, X and Ku bands which have many applications in wireless communications such as GSM, DCS, CDMA and PCS II. DESIGN OF THE ANTENNA The geometry and layout of the proposed split P-shaped MPA are depicted in Figure 1 and Table 1 shows the summary. This antenna consists of three layers patch, substrate and ground and all the measurements are done in mm scale. In this antenna, FR-4 (lossy) is used as a dielectric substrate. This substrate having a height of 1.6 mm and a relative dielectric constant (εr) of 4.4. The dimension of the substrate is 18×20×1.3 mm 3 . Copper annealed is used as the patch and ground material. When there is a little change in the feed line, there is a remarkable change in resonances. It is the shape of the antenna that makes it possible to resonate at a different range of frequencies. Figure 1: The geometry of the proposed MPA Figure 2: Dimensions of the antenna 19 th International Conference on Computer and Information Technology, December 18-20, 2016, North South University, Dhaka, Bangladesh 978-1-5090-4090-2/16/$31.00 ©2016 IEEE 68 ISBN 978-1-5090-4089-6