Radiofrequency Transparent Uniaxial Dual‐Polarized Metasurface with Ultrawide Brewster Angle Stability

Abstract Electromagnetic (EM) selective structures with high transmission and ultrawide angular coverage are essential for applications ranging from military fields, such as high‐speed aircraft, to civilian domains, such as 5G communications, enabling omnidirectional spatial EM information perception. However, traditional EM selective structures suffer from increasingly severe characteristic impedance mismatches under the large‐angle oblique incidence of EM waves. To overcome this dilemma, a polarization‐insensitive uniaxial dielectric‐magnetic metasurface is proposed with ultrawide Brewster angle stability to realize perfect radiofrequency transparency. It is theoretically demonstrated that a uniaxial dielectric‐magnetic slab can exhibit ultra‐wide‐angle transmission properties while maintaining polarization insensitivity. As a proof of concept, a uniaxial dielectric‐magnetic metasurface structure is designed, fabricated, and measured to simultaneously achieve wide‐band and wide‐angle radiofrequency transparency phenomena with transverse electric and transverse magnetic polarization responses. This study fundamentally resolves the theoretical challenge of characteristic impedance mismatch in traditional EM surfaces under large‐angle oblique incidence, achieving an unprecedented realization of ultrawide angular, high‐efficiency transmission for arbitrarily polarized electromagnetic waves.