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.
Highlights
With the rapid development of wireless communication technology and the increasing demand of multimedia service, it is extremely urgent to realize the data communication with high speed and large capacity
In order to improve the isolation between the two ports of the MIMO antenna, many designs have adopted the defect ground structure to meet the requirements of high isolation in MIMO antenna [3] [4]. [3] designs an ultra wideband (UWB) antenna
Study [6] provides a design of twoport UWB MIMO antenna system with high isolation using a fork-shaped structure
Summary
With the rapid development of wireless communication technology and the increasing demand of multimedia service, it is extremely urgent to realize the data communication with high speed and large capacity. In order to improve the isolation between the two ports of the MIMO antenna, many designs have adopted the defect ground structure to meet the requirements of high isolation in MIMO antenna [3] [4]. Study [6] provides a design of twoport UWB MIMO antenna system with high isolation using a fork-shaped structure. An ultra wideband (UWB) MIMO antenna is designed in [7], which uses the floor gap and the vertical polarization mode to effectively improve the isolation of the two antennas in the 3 - 4.5 GHZ band. In order to reduce the coupling between antenna elements, the four antenna elements are arranged vertically to achieve vertical polarization effect; in the design of [9], UWB antenna is a printed dipole antenna, and antenna element is arranged vertically to achieve high isolation between the antennas. One works in a single frequency 2.4 GHZ (ISM), and the other can cover large bandwidth in 3G and 4G-LTE
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