Abstract
Metamaterials are artificial structures with the ability of exhibiting unusual and exotic electromagnetic properties such as the realisation of negative permittivity and permeability. Due to their unique characteristics, metamaterials have drawn broad interest and are considered to be a promising solution for improving the performance and overcoming the limitations of microwave components and especially antennas. This paper presents a detailed review of the most recent advancements associated with the design of metamaterial-based antennas. A brief introduction to the theory of metamaterials is provided in order to gain an insight into their working principle. Furthermore, the current state-of-the-art regarding antenna miniaturisation, gain and isolation enhancement with metamaterials is investigated. Emphasis is primarily placed on practical metamaterial antenna applications that outperform conventional methods and are anticipated to play an active role in future wireless communications. The paper also presents and discusses various design challenges that demand further research and development efforts.
Highlights
A NTENNAS provide the wireless transmission and reception of electromagnetic signals and play an essential role in modern telecommunications
This article presented a detailed review of antennas inspired by metamaterial principles and highlighted their strengths and weaknesses
A brief introduction in the theory of metamaterials provided an insight into their novel properties and capabilities
Summary
A NTENNAS provide the wireless transmission and reception of electromagnetic signals and play an essential role in modern telecommunications. The latest wireless technologies such as the upcoming 5G networks and IoT (Internet of Things) represent the vessel for the establishment of a new era with advanced connectivity. As the demand for higher data rates, reliable communication links, and compact high-performance transceivers booms, the antennas have to adapt and satisfy the ever-increasing requirements. Modern antennas shall have small size, low-profile and high bandwidth, while the radiation pattern and gain should be sufficient. Multi-antenna technologies such as massive MIMO and beamforming arrays set additional antenna design challenges [1], [2]. The design of antenna systems becomes highly complicated, especially as the number of elements increases
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