TITLE:
Analysis and Design of 4 × 4 MIMO-Antenna Systems in Mobile Phone
AUTHORS:
Deshun Sun, Chongyu Wei
KEYWORDS:
Isolation, Wideband, Multiple-Input-Multiple-Output (MIMO), Mutual Coupling, Defect Ground, Correlation Coefficient
JOURNAL NAME:
Journal of Computer and Communications,
Vol.4 No.2,
February
17,
2016
ABSTRACT: MIMO antenna systems can greatly improve
the capacity and transmission rate of wireless communication. In this letter,
two four-port multiple-input-multiple-output (MIMO) antenna systems are
proposed in mobile devices. An algorithm of calculating envelope correlation
(ρe) between antenna units is also proposed. By this algorithm the ρe of the
PIFA-MIMO antenna system has been calculated. First, a PIFA-MIMO antenna system
is designed for ISM (2.4 GHZ) application. The slots are etched on the ground
and the antenna units are placed in such a way that the polarization diversity
is exploited to enhance the impedance matching and isolation. Based on this, a
printed wideband MIMO antenna system is proposed for portable 3G and 4G
applications by means of multi-branch and the defect of ground technology,
increasing the bandwidth and reducing mutual coupling between the antennas. The
simulation results show that the return loss and isolation of the two antenna
systems can meet the performance requirements of the antennas in the mobile
phone.