SLA printed horn antenna with filtering network based on dual‐mode ellipsoid resonator

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 (due to the high Qu resonator) and the performance is less sensitive to the fabrication errors. The antenna was demonstrated at Ku band (12–18 GHz), with a measured RL >10 dB across the passband of 14.6–15.4 GHz. The measured gain of the antenna is 11.4 dBi at 15 GHz and maximum in-band gain variation is 0.4 dB.