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Reflectionless Microwave Quarter-Wave Plate Using Hyperbolic Metamaterials

In this paper, a novel reflectionless microwave quarter-wave plate to convert a linearly polarized incident wave into a circularly polarized wave is proposed by using hyperbolic metamaterials. A reflectionless quarter-wave plate by using the double split-ring resonators and metallic wires is designed at 6.9 GHz, and the transmission characteristics are studied numerically by using HFSS. It is shown that the quarter-wave plate is almost perfectly matched the free-space wave impedance for both the x- and y-polarized incident waves with π/2 phase shift and the operation of the circularly polarized wave conversion is confirmed. The numerically calculated axial-ratio of the designed quarter-wave plate is as small as 0.26 dB.