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This paper presents a horn antenna with a 5th‐order dual‐mode ellipsoid resonator filtering network, fabricated by stereo lithography apparatus 3‐D printing technic. The filtering part employs two dimpled ellipsoid dual‐mode resonators, operating at the fundamental TM101 mode. Compared to the filters employing cylindrical resonators with tuning posts, the proposed filtering network is with lower loss...
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