Design of broadband tri-polarized antenna for wireless MIMO systems

This paper present about the development of broadband tri-polarized antenna design that operates at frequencies of 2.4GHz for wireless MIMO communication system. Polarization diversity is one of the handy techniques to improve performance between base station and the user because it can reduce spatial correlation that can decrease system performance. The design process can be divided into three design steps. First, the linear broadband antenna is designed by using a fork like tuning stub method. Then, the dual circular polarization antenna is designed by using a stub method on a two ports circular microstrip antenna. Finally, two selected designs from step one and step two are combined. This combination antenna will obtain broadband tri-polarized antenna that operates at 2.4GHz. The design is simulated by using CST Design Microwave software. The antenna was designed to generate linear polarization, RHCP (right hand circular polarization) and LHCP (left hand circular polarization) on port 1, port 2 and port 3 respectively. The simulation design is then fabricated on FR4 board and measured. Then, the simulation and measurement result are compared and analyzed.