A Super-Wideband and High Isolation MIMO Antenna System Using a Windmill-Shaped Decoupling Structure

A Super-Wideband and High Isolation MIMO Antenna System Using a Windmill-Shaped Decoupling Structure

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In this paper, a novel super-wideband multiple-input multiple-output (SWB-MIMO) antenna system with high isolation has been proposed, each antenna element consisting of a spade-shaped radiation patch, a defected ground structure (DGS) as well as a windmill-shaped decoupling structure.The elliptical slot etched on the radiation patch and the rectangular Hair Styling Balm DGS are jointly utilized to make better the radiation performance and impedance bandwidth.Both of four-element and eight-element SWB-MIMO antenna systems are simulated and analyzed, respectively.A prototype of the four-element SWB-MIMO antenna system with total dimensions of 58 mm $ imes58$ mm $ imes 1$ mm was fabricated to verify Kits the concept of design using an FR4 material substrate.

Measurement and simulation results indicate that the proposed SWB-MIMO antenna system can work in the frequency band ranging from 2.9 to 40 GHz with a mutual coupling of lower than-17 dB.Also, excellent performance has been achieved with a low envelop correlation coefficient (ECC) of lower than 0.04, high multiplexing efficiency ($eta _{mathrm {mux}}$ ) of more than-3.

0 dB, stable gain of up to 13.5 dBi as well as quasi-omnidirectional radiation properties.This design provides an important guideline for obtaining a super-wide MIMO antenna.