Open AccessCircularly polarised MIMO ground radiation antennas for wearable devices
Author(s) -
Qu Longyue,
Piao Haiyan,
Qu Yunhao,
Kim HyungHoon,
Kim Hyeongdong
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.4348
Subject(s) - ground plane , bandwidth (computing) , mimo , standing wave ratio , optics , physics , radiation , acoustics , electrical engineering , electronic engineering , engineering , microstrip antenna , telecommunications , antenna (radio) , beamforming
Two ground radiation antennas with polarisation diversity performance were proposed for MIMO WLAN applications in wearable devices. The antennas can simultaneously excite the vertical mode and horizontal mode of the ground plane and the phase difference between the two modes can be controlled by utilising an inductor‐loaded metal strip in the ground plane, generating circular polarisation. A 3:1 VSWR bandwidth of 140 MHz with high isolation (above 17 dB) and a 3 dB axial ratio bandwidth of 100 MHz was obtained. The opposite rotations generated by the two antennas resulted in good diversity performance, which was verified by the measured envelope correlation coefficient.