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A Low-Loss Quasi-OpticalMetamaterial Circular Duplexer for 6G Communication

A 670GHz low-loss quasi-optical metamaterial circular duplexer for 6G communication is introduced. The duplexer is composed of a T-shaped absorbing cavity, a metamaterial circular polarizer, and a polarizer. While working at 660GHz-700GHz, the insertion loss is less than 3dB, the extinction ratio is less than 30dB, the axial ratio is less than 3dB.