Performance Enhancement of Multiband MIMO Antenna Using Metasurface

Abstract

The advent of 5G wireless communication has opened a new world of applications such as the Internet of Things (IoT), remote healthcare, RFID, virtual reality (VR) as well as drone based deliveries. 5G technologies supporting various use cases have spurred unprecedented demand for compact devices supporting high data rates. To support such opulent use cases with high data rate demands, 5G networks use high-frequency spectrum bands to transmit data. However, high-frequency bands are more susceptible to interference from buildings, trees, and other obstructions. Therefore, 5G networks extensively rely on implementing MIMO technology to improve signal quality and data transmission speeds by increasing the count of antennas at both the transmitting and receiving ends. A MIMO antenna system can be defined as a wireless communication technology that uses multiple copies of signals to be transmitted and received through multiple antennas at the transmitter and receiver end. Thus, MIMO antenna systems improve communication quality by enhancing system channel capacity and exponentially improving the performance of communication systems without increasing spectrum resources and antenna transmission power. To design a MIMO antenna system, an inter-element distance equivalent to one half of the operating wavelength of the antenna (and#955;/2) is utilized in order to get uncorrelated copies of signals, But this inter-element distance results in a large size of the MIMO antennas. On the other hand, when the inter-element distance is decreased, the mutual coupling results in poor performance in terms of gain and isolation. Moreover, to support a multitude of applications, a multiband MIMO antenna is also equally essential. Therefore, designing a multiband MIMO antenna with a compact structure, high isolation, and high gain is still a challenge. This thesis studies a methodology to design compact multiband MIMO antennas and enhance their performance using metasurface. The design of metamaterial unit cells like munegative (MNG), epsilon