Firstly, it is proposed that the antenna element is a common planar waveguide fed rectangular patch antenna, and a π type slot is dug in the ground and three metal cylinders are embedded, so that the antenna can generate two resonant modes between 26.46-29.89 GHz. The antenna can completely cover the band-n257 (26.5-29.5 GHz) band proposed by 5g new telecom. The maximum gain of a single antenna can reach 6.87dbi, and the efficiency is more than 90%.<br>
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