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In this paper, we propose loading layers of slit pairs with halfwavelength spacing over a corporate-feed waveguide slot array antenna in the 30 GHz band. This structure is expected to improve the isolation between transmitting and receiving antennas arranged in the E-plane. As a result of the design, the reflection of the radiating element is suppressed under −14 dB over a target band . The isolation between two antennas using a 2 × 32-element model is improved by about 20 dB compared to thedoi:10.1587/comex.2020xbl0148 fatcat:w3lezhvxb5a6zbxsydrpfvek2m