A High Gain Corrugated Horn Antenna with Dielectric Lens

??? ??????????????? corrugation ????????? ????????? PTFE ?????????(????????????=2.1) ????????? ????????? ????????? ????????? ????????? ?????????????????? ????????? ????????? ????????? ????????? corrugated ??? ???????????? ???????????????. ????????? ???????????? X ??????(8???12 GHz)?????? —25 dB ????????? ?????? ???????????? ????????? ?????????, ?????? ???????????? 10 GHz?????? ?????? ????????? 22.3 dBi??????, ???????????? ?????? ?????????110 mm×110 mm×135 mm??????. ????????? ???????????? ????????? ??????????????? ???, ???????????? ?????? ??????????????? ???????????? ???????????????????????????, ?????? LNG ??? LPG??? ?????? ?????? ???????????? ??? ???????????? ????????? ????????? ????????? ?????? ?????? ??????????????? ????????? ??????????????? ????????? ??? ?????? ????????? ????????????. A horn antenna with corrugation structure and a PTFE(Polytetrafluoroethylene) teflon(relative permittivity=2.1) dielectric lens for good impedance matching characteristic and high gain performance is proposed in this paper. The proposed antenna shows measured return loss below —25 dB over the operating X band(8???12 GHz), the peak gain of 22.3 dBi at the center frequency(10 GHz) and has overall size of 110 mm×110 mm×135 mm. Considering the performance of the proposed antenna, it is suitable for being inserted in a radar level transmitters, particularly for gas tanks on vessels or off-shore plants containing gas with very low reflectivity and relative permittivity such as LNG or LPG.