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All-Polarization Blazed Surface

Low-profile blazed structures reported recently can reflect oblique incident wave with certain polarizations back to the incident direction. Only 3-D blazed structures, however, can operate for all polarization. In this paper, we introduce an all-polarization blazed surface realized by resonant gratings. Consisting of square patch as the unit cell, the design is capable to reflect incident wave with any linear, circular, or elliptical polarizations back to the incoming path. The polarization of the reflected wave follows the same rule as the wave reflected by a perfect electrical conductor (PEC) mirror, that is, linear polarization being reflected without change, while circular or elliptical polarization reversed upon reflection. The autocollimation blazing is demonstrated by both simulation and measurement in the X band frequencies.