Wide-Angle Scanning and High-Isolation Millimeter Wave Antenna Arrays Based on Metasurfaces

This paper presents two metasurface-based design approaches for millimeter-wave (mm-Wave) antenna arrays to simultaneously achieve wide-angle beam scanning and high-isolation between array elements. One approach is to use an electromagnetic bandgap ground (EBGG) instead of the metallic ground of a conventional microstrip patch antenna array. Another method is to place a high dielectric constant layer (HDL)-mimic metasurface above patch antenna array. Both approaches effectively enlarge the beamwidth of element pattern and reduce the coupling between array elements. Thus, wide-angle scanning and decoupling performances are realized simultaneously. To prove the design concept, two distinct prototype examples are demonstrated to explain the design guidelines and considerations. The developed metasurface-based design methods exhibit universality, low cost, and easy integration. They are ideal design approach for mm- Wave antenna arrays in mobile terminals that require wide-angle beam scanning and high isolation.