A Compact Quad-Element UWB-MIMO Antenna System with Parasitic Decoupling Mechanism

Abstract

This research work proposes a compact four-port multiple-input multiple-output (MIMO) antenna that operates in the whole license free ultra-wideband (UWB) spectrum of 3.1–10.6 GHz. Spatial diversity has been introduced by arranging these antennas in close proximity without developing a strong mutual coupling. Antenna elements are evolved from a conventional rectangular patch antenna whereas a customized decoupling structure is introduced on the back side of the substrate to achieve the desired isolation level. The parasitic decoupling structure consists of different features which are resonant at different frequencies offering a whole UWB coverage. In addition to the decoupling structure a dumbbell shaped stub has also been introduced to the partial ground plane to suppress the mutual coupling. The overall measured isolation among elements is more than 20 dB. Different MIMO performance parameters have also been investigated from the measured results. Whole MIMO system measures 0.41 λo × 0.44 λo at 3.1 GHz. The MIMO system is intended for high data rate and short-range communication devices used in wireless personal area networks.

Flexibly Extensible Planar Self-Isolated Wideband MIMO Antenna for 5G Communications

“…TARC is defined as the ratio of the square root of total power divided by the square root of the total incident power [20]. For an eight-port MIMO system, TARC can be described using the method in [21], as shown in Equation (1): In order to better characterize the bandwidth of MIMO antenna, the total active reflection coefficient (TARC) [19] needs to be calculated. TARC is defined as the ratio of the square root of total power divided by the square root of the total incident power [20].…”

“…TARC is defined as the ratio of the square root of total power divided by the square root of the total incident power [20]. For an eight-port MIMO system, TARC can be described using the method in [21], as shown in Equation (1):…”

“…where S i can be expressed as follows: The TARC value of <0 dB is desirable for a MIMO system [21]. The simulated and measured TARC curves in decibels are displayed in Figure 13.…”

“…The measured results indicate that the value of TARC for the proposed antenna is less than −10 dB within the band of 3.83-7.25 GHz. The TARC value of <0 dB is desirable for a MIMO system [21]. The simulated and measured TARC curves in decibels are displayed in Figure 13.…”

Isolation Improvement Using Asymmetric Radiators and Ground Plane Diversity Mechanism in a Six-Element Uwb Mimo Antenna Design

“…Total Active Reflection Coefficient has been proposed. This metric gives an idea concerning the overall match of the MIMO system taking into consideration the electromagnetic coupling effects between ports [16]. Formula (3) can be used for MIMO TARC calculation.…”