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This paper presents the design and experimental demonstration of animpedance-matched circular polarization selective surface which also offersspin-selective phase modulations at microwave frequencies. We achieve this byleveraging the theory of Pancharatnam-Berry phase and cascading four tensorimpedance layers, each comprising an array of crossed meander lines. Thesemeander lines are precisely tuned and rotated to implement particular tensorsurface impedance values to satisfy the impedance-matching condition for thetransmitted right-handed circularly-polarized field while inducingPancharatnam-Berry phase shift for the reflected left-handedcircularly-polarized field. We present a detailed numerical synthesis techniqueto obtain the required impedance values for satisfying the impedance matchingcondition, and demonstrate spin-selective phase modulations based onPancharatnam-Berry phase shifts. To verify the proposed idea, we experimentallydemonstrate nearly-reflectionless transmission of right-handed circularpolarization at broadside and reflection of left-handed circular polarizationat 30 degrees off broadside at 12 GHz. For this purpose, a free-spacequasi-optical set up and a near-field measurement system are respectivelyemployed for measuring the transmitted and reflected circularly-polarizedfields.

Design and experimental demonstration of impedance-matched circular polarization selective surfaces with spin-selective phase modulations