TITLE:
MIMO Antenna for UWB Communications
AUTHORS:
Joseph Jervase-Yak, Ali Hamed Al-Shamsi
KEYWORDS:
Antenna Efficiency, Diversity Gain, MIMO Antenna, Total Active Reflection Coefficient (TARC), Ultra-Wideband (UWB) Antenna
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.9 No.5,
May
30,
2016
ABSTRACT: Design of ultra-wideband antennas is
challenging in the stringent requirements that are often conflicting to achieve
a wide impedance bandwidth while maintaining high radiation efficiency, uniform
gain and compact size. A Multiple-Input Multiple-Output (MIMO) antenna system
can enhance the overall antenna performance but at having to overcome new
challenges such as reducing the mutual coupling and the correlation between the
elements. A printed circular disc compact planar antenna is selected in this
work due to its UWB performance and compact size for the MIMO antenna system. A
parametric analysis is carried out to achieve an optimal design. The system
developed consists of two elements with an overall size of 59 × 27 mm. The
designed antenna system operates over the whole of the UWB bandwidth from 3.1
to 10.6 GHz with radiation efficiency up to 85% and reflection coefficients
less that ?10 dB. The envelope correlation is less than ?60 dB throughout the
UWB band while the diversity gain approaches 10 throughout the entire UWB bandwidth
and Total Active Reflection Coefficient (TARC) between the antenna elements is
less ?11 dB. Thus the proposed MIMO antenna outperforms similar antenna systems
reported in the literature.