Open AccessIsolation improvement of UWB MIMO antenna utilising molecule fractal structure
Author(s) -
Rajkumar S.,
Anto Amala A.,
Selvan K.T.
Publication year - 2019
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.2019.0592
Subject(s) - mimo , radiation pattern , antenna factor , antenna measurement , antenna (radio) , fractal antenna , electronic engineering , coaxial antenna , acoustics , physics , optics , telecommunications , computer science , engineering , beamforming
A compact four‐element UWB MIMO antenna is proposed and its characteristics are investigated. The proposed antenna has a hexagon molecule‐shaped fractal structure as its radiating element. The antenna elements are placed orthogonally to each other in order to yield good isolation, without any additional decoupling structure. The band rejection in WLAN band is attained by etching a C‐shaped slot on each radiating element. The antenna has a compact size of 40 × 40 × 1.6 mm 3 and exhibits stable omni‐directional radiation pattern. In addition, it shows an acceptable impedance bandwidth ( S 11 < −10 dB) in the range 2.4–10.6 GHz with an isolation better than −20 dB over the UWB range. The performance of the proposed antenna is calculated in terms of antenna characteristics and MIMO parameters. The isolation level in‐between the elements is found to be reasonable for MIMO application. The simulated and measured results are in good accord which makes the antenna a suitable candidate for massive MIMO and high‐density packaging applications.