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We propose and numerically investigate a novel asymmetric capsule-shaped metallic cavity (ACMC) structure for unidirectional waveguide coupling. By introducing cylindrical facets at cavity ends with different radius, asymmetric resonant mode is confined inside the cavity so that the evanescent energy can be unevenly coupled into the two directions of the waveguide underneath the cavity. We conduct three-dimensional finitedifference time-domain simulations and demonstrate the effectiveness ofdoi:10.1109/jphot.2020.3033548 fatcat:te3znxkw6re6nhu76tbmymoxoy