Dielectric Metamaterial-Based Impedance-Matched Elements for Broadband Reflectarray

A dielectric metamaterial-based broadband impedance-matched reflectarray element is presented. The dielectric metamaterial is composed of an impedance-matching layer and a phase-shifting layer. First, the impedance-matching layer is critical for achieving a linear reflection phase response in a broad bandwidth. Full 360° reflection phase variation can be derived by changing the effective permittiv...