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.
Highlights
In recent years, data rate and channel capacity issues have been expansively investigated, since high throughput is imperative for modern wireless devices [1]
Diversity performance of the proposed multiple-input multiple-output (MIMO) antenna is established by evaluating the performance parameters like envelope correlation coefficient (ECC), total active reflection coefficient (TARC), channel
Partial ground plane with tapered top edges with certain defects have been introduced introduced at the top edge of each radiating patch
Summary
Data rate and channel capacity issues have been expansively investigated, since high throughput is imperative for modern wireless devices [1]. The staircase shaped decoupling and defected ground structure provides the isolation level of 22 dB This antenna is designed for portable wireless systems. The T-shaped stub in the ground plane provides necessary isolation between antennas This design has an isolation of 15 dB with the much larger size in comparison. The proposed system operates in LTE band with sufficient MIMO performance This system has much larger size with the minimum isolation level of 10.5 dB. Another semi-elliptical two-element UWB-MIMO antenna is reported in [27] This design has larger size along with the isolation level of 18 dB. 6. offers multiple resonances in order to ensure wideband decoupling the back of substrate which for across elements, these structures provide isolation better than 20 dB in the entire frequency band
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