Dual Polarization Inset-Fed Microstrip Patch Antenna M. S. R. Mohd Shah 1 , M. F Abdul Kadir 1 , D. Misman 1 , M. Z. A. Abdul Aziz 1 , M. K Suaidi 1 , I. M. Ibrahim 1 , M. K. A Rahim 2 1 Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Ayer keroh, 75450, Melaka. 2 Radio Communication engineering, Faculty of Electrical Engineering Universiti Teknologi Malaysia, 81300 Skudai, Malaysia. E-mail: syaifulredzwan@gmail.com, mohamadzoinol@utem.edu.my, kadim@utem.edu.my 1. Introduction In various application of dual polarization antenna, the microstrip antenna element has offers three excellent advantages relative to other types of antennas [5]-[7]; low weight, low profile with conformability and low manufacturing cost. Recently, in many wireless communication and radar system, a dual polarized is greatly desired. In practices, a dual-polarized microstrip antenna can be realized by feeding the rectangular microstrip patch at two orthogonal edges, through edge feed or probe feed, which excites TM 01 -and TM 10 - mode with orthogonal polarizations [1]–[4]. Both the element itself and its array often achieve isolation of about -20dB [1]–[3].The most reported technique for achieving dual polarization is using different feed mechanisms such as aperture-coupling a single patch with crossed narrow slots or two offset narrow slots [5]. This technique requires a relatively complicated feed arrangement [6] or a complex multiplayer construction [7] to reduce the coupling between the two feed lines and therefore adds complexity to the fabrication process. In this letter, the design of inset fed microstrip antenna is proposed at 45º and -45º to achieve the optimum performance of the return loss, antenna gains and polarization loss. A design of the broadband dual- polarized microstrip antennas is proposed by using the simply inset feed technique but slant at desired rotation. In most applications, the requirement of propagation can be met with a single patch structure. However, in some cases, sharp beamwidth was required, as well as maintaining a low profile structure, which arise the development of microstrip patch array antennas. Both design of array antennas in this paper were connected using parallel feed quarter-wave transformer impedance matching technique. 2. Design Procedure Corresponding to the optimum design, an antenna has been fabricated and tested. Details of the antenna design and its measured performance are presented and discussed. There were several ways to design microstrip antennas such as transmission line, inset fed, proximity and aperture models. Details of the designed broadband dual-polarized microstrip antennas is proposed by using the inset feed technique [9].The parametric study on the single patch antenna is done first to understand the characteristics of the antenna. This paper is focusing on the combination of the same antenna to obtain a better response by developing the arrays. For this project, a parallel or corporate feed configuration was used to build up the array. In parallel feed, the patch elements were fed in parallel by using transmission lines. The transmission lines were divided into two branches according to the number of patch elements. The quarter-wave transformer impedance matching technique was applied to divide the power equally to all patches. The impedances of the line were translated into length and width by using Microwave Office 2006. Figure 1 show