Open AccessMulti‐frequency dual polarisation radiometer common aperture antenna feeding system
Author(s) -
Hongjian Wang,
Qiyan Hao,
Min Yi,
Dehai Zhang,
Xingchao Dong,
Yang Liu,
Xue Chen
Publication year - 2018
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5158
Subject(s) - radiometer , optics , horn antenna , wideband , french horn , bandwidth (computing) , aperture (computer memory) , broadband , acoustics , transducer , feed horn , band pass filter , materials science , physics , antenna (radio) , radiation pattern , engineering , electrical engineering , slot antenna , telecommunications , periscope antenna
This study presents a design of a tri‐band dual polarisation common aperture feed horn used for the radiometer. The proposed feeding system is made up of a corrugated horn, an orthomode transducer (OMT) and two pairs of a high‐pass filter (HPF) and a band‐pass filter (BPF). The broadband profiled corrugated horn loaded with teeth (rings) is adopted as the feed of the radiometer. Wideband finline OMT is developed to realise a bandwidth ratio in excess of 2:1. Two different HPFs and BPFs are employed to block and pass waves of different frequencies. The feeding structure is then simulated, fabricated and tested. The measured results show that the radiation patterns possess good symmetry at all three working frequencies of interest (18.7, 23.8 and 37 GHz). Furthermore, the cross‐polarisation levels are below −23 dB and voltage standing‐wave ratios are lower than 1.5 throughout all working bands.