Abstract
A compact 3-dimensional dual-element, multiband antenna for Multi-Input-Multi-Output (MIMO) applications is proposed in this paper. Folding technique along with various impedance matching structures are employed for miniaturization and multiband operation while maintaining the desired S-parameter performance. A grid of Frequency Selective Surface (FSS) patch based decoupling structure is introduced to achieve measured isolation of more than 30 dB between antenna ports. In addition to this decoupling structure, a meandered line based defected ground plane configuration helps to retain the multiband response while maintaining the optimum isolation performance. This 3D-MIMO antenna is fabricated and measured for its performance in different bands of WLAN, WiMAX, 5G cellular and 5G Wi-Fi along with different MIMO performance parameters. The reported design is a suitable option for multiband MIMO applications for future wireless technologies.
Highlights
Exponential growth in adoption of portable devices has raised the miniaturization standards and demand for value added features
MIMO antenna system has a potential application in wireless communications to transmit data efficiently; when several antenna elements are placed in a close proximity, the data transmitted through different channels develop correlation, owing to undesired coupling between antennas, which in turn degrades the diversity performance of the MIMO system [7]
MIMO PERFORMANCE The MIMO performance of the proposed system is evaluated through certain parameters including Envelope Correlation Coefficient (ECC), Channel Capacity Loss (CCL), Diversity Gain (DG) and Total Active Reflection Coefficient (TARC)
Summary
Exponential growth in adoption of portable devices has raised the miniaturization standards and demand for value added features. Another study presents a 2 × 1 multi-band MIMO array comprising 3D antenna elements [16] This configuration achieves isolation of 23 dB while having large dimensions of 300 mm × 200 mm. In [19], a 60 mm × 100 mm dual element multiband MIMO antenna system is reported for indoor wireless applications This proposed structure maintains less than 30 dB isolation over a limited frequency spectrum. In [21] a 120 mm × 80 mm dual-antenna system with a folded fork-shaped ground branch for electromagnetic decoupling is proposed This multiband MIMO achieves isolation of maximum 15 dB in the operating band. MIMO performance parameters are reported in section V, Section VI presents detailed comparison of proposed system with existing literature and section VII concludes the paper
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