Title :
Dual-polarised cavity-backed annular slot antenna of compact structure
Author :
Weiwen Li ; Chen, X.J. ; Zhang, Boming ; Zhou, J.H. ; You, B.Q.
Author_Institution :
Dept. of Electron. Eng., Xiamen Univ., Xiamen, China
Abstract :
A unidirectional dual-polarised antenna is presented, by applying a cavity-backed annular slot and two mutually perpendicular microstrip feed lines. To improve the isolation between two ports of the designed antenna, a pair of conductor strips is introduced at the opposite side of the feed lines and a metal cylinder into the cavity centre. Aimed at 2.4 GHz wireless local area network systems, a prototype antenna has been fabricated based on the FR4 substrate. The measured results show that an isolation value of over 33 dB can be attained and the co-polarised level is 30 dB larger than the cross-polarised in the main radiation direction. In addition to compact structure, the operating band with about 5 dBi antenna gain indicates the proposed antenna is suitable for indoor multiple-input-multiple-output (MIMO) base station systems.
Keywords :
MIMO communication; UHF antennas; antenna feeds; antenna radiation patterns; conductors (electric); indoor radio; microstrip lines; microwave isolators; mobile radio; slot antennas; substrate integrated waveguides; wireless LAN; FR4 substrate; compact structure; conductor strips; frequency 2.4 GHz; indoor MIMO base station systems; indoor multiple-input-multiple-output base station systems; isolation improvement; metal cylinder; mobile terminals; mutually perpendicular microstrip feed lines; radiation direction; unidirectional dual-polarised cavity-backed annular slot antenna; wireless local area network systems;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2014.2715
