DESIGN OF OAM (ORBITAL ANGULAR MOMENTUM BASED MIMO SYSTEM

Abstract

Multiple-input-multiple-output (MIMO) systems was established for Fourth generation (4G) wireless communication for high data rate desires. In MIMO systems need that their antenna should have high port isolation and low correlation between it elements. The wireless devices, where these systems are realized require that their antenna must be low-profile and fit within the enclosing of the device. With these restrictions make antennas design for MIMO system is a difficult task. Antenna is a standout amongst the most imperative piece of any communication device. A ordinary antenna dimension determine by half wavelength of its operating resonance frequency. Its radiation characteristics reduce when decreasing the size of it away from this limit. Hence in this report, I am proposing a Multi-Input Multi-Output (MIMO) system. Electromagnetic wave carrying orbital angular momentum (OAM) are using in wireless communication has attracted increasing concern over the last few years. In this thesis I have designed an OAM based MIMO system and then compared this with conventional MIMO system. OAM based MIMO system can increase channel capacity when the communication link distance between them is long enough, is proposed in the results. The main difference between an OAM system and simple MIMO system is that the spacing between OAM elements is much more greater and hence, it reduce the mutual coupling between the antennas in MIMO system array. The results shows that OAM based MIMO system is a developed version of MIMO system. OAM is appropriate for larger distances where the multi-path effect is weak. It is used in huge MIMO system too. In this report a 2×2 MIMO system is designed using a pair of square patch antennas and the return loss, mutual coupling between the two antennas is evaluated using CST Studio 2014. A 3×4 metamaterial base unit-cells array placed between antennas. It improve the isolation and reduce the coupling between them. So, the channel capacity will be more increased