Metamaterials in antenna design and technology

In this contribution, we present some designs showing the possible benefits of the employment of metamaterials in antennas. We show how cloaking devices, commonly used to reduce object observability, may be used to limit the negative effects due to the presence of obstacles in the near-field of an antenna. When going at optical frequencies, we show that metamaterials may be used to design proper screens to enhance the otherwise poor directivity of nano-antennas.