The demand for wireless data is increasing day by day due to the advancement in the advancement of wireless communication technologies. To fulfill the growing requirement for wireless spectrum, researchers worldwide are working toward developing effective multiplexing techniques for the next generation systems. Various multiplexing technologies based on frequencies, phase, and polarization have been meticulously implemented in the past (till 4G wireless systems). In the current 5G, a massive multiple-input multiple-output (MIMO) system is being used for spatial multiplexing to enhance the system peak data rate (up to 20 Gbps). However, the expected data rate requirements by 2030s will be 3–5 times the current 5G data rates to drive emerging wireless applications such as artificial-intelligence-based industrial automation, blockchain for data validation, the Internet of Things, and brain-computer interfaces. A new strategy based on harnessing of microwaves with orbital angular momentum (OAM) has recently been proposed for beyond 5G communication systems to meet the need for an explosive data rate. The OAM-based multiplexing techniques are promising for increasing channel capacity by allowing simultaneous transmission of multiple orthogonal modes at the identical frequency over a single communication channel. The result is a substantial increase in channel capacity, providing a multifold enhancement without the need for increasing antenna system complexity or requiring sophisticated algorithms. In this thesis, attempts have been made to provide OAM antenna solutions to achieve this high-speed communication.