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Recent Development of Microwave and Millimeter-Wave Dual-Circularly-Polarized Arrays

This paper presents a summary of recent development of dual-circularly-polarized arrays, including antenna arrays and reflect-/transmit-arrays, at microwave and millimeter-wave frequencies. They are enabled by utilizing both the rotational phase due to element rotation and dynamic phase provided by phase shifters or resonator with different sizes. The design and experimental results of several illustrative dual-circularly-polarized antenna array and reflect/transmit-array examples are shown.