De‐scattering Methods for Coexistent Antenna Arrays

This chapter presents a number of approaches for de‐scattering with the aim to maintain the integrity of element radiation patterns in multiband arrays. While one can solve the basic coupling problem by using the various decoupling methods, most decoupling methods reported to date only address impedance‐matching issues. The chapter also presents a number of “de‐scattering” techniques. Since the mobile communications industry has rather stringent requirements on the radiation patterns produced by base station antennas in order to provide adequate coverage, these de‐scattering methods are expected to become invaluable for future antenna array designs. Scattering‐cancelation‐based cloaks or mantle cloaks are a type of metasurface that has been introduced specifically to reduce scattering from an antenna. Compared to the lumped‐choked low‐band antenna, the distributed‐choked antenna is easier to match and has a wider bandwidth. However, both the lumped‐choked and distributed‐choked antennas suffer from slightly reduced gain values when they are compared with conventional cross‐dipoles.