Abstract
This paper presents a compact, uni-planer wide band Multiple-Input-Multiple-Output (MIMO) antenna. The designed antenna array has a compact size of (26mm x 31mm) covering a wide frequency band from 3.1GHz - 11GHz. A partial ground plane shared by two radiating patches is used. A ground stub and a single column Electromagnetic Bandgap (EBG) structure in between the two radiating patches results in very low mutual coupling in the designed antenna. The proposed MIMO-antenna was evaluated through different performance metric indicators like channel capacity loss, far-field radiation pattern, S-parameters, envelope correlation coefficient, peak gain, diversity-gain and radiation efficiency. Our designed MIMO antenna has a very high isolation amongst the MIMO antennas ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{S}_{21} < -25$ </tex-math></inline-formula> dB), a high Diversity-Gain (DG <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$>9.995$ </tex-math></inline-formula> dB), a very low Envelope Co-relation Coefficient of (ECC < 0.001) and low Channel-Capacity-Loss (CCL < 0.1bits/s/Hz). The said antenna has an average radiation efficiency of 85.5% and a peak gain of (5.67dB) within the ultra-wideband (UWB) spectrum. A 0.8mm thick FR-4 substrate is used to fabricate the MIMO-antenna and tested in an anechoic chamber. The measured results closely match with the simulated results.
Highlights
Wideband antenna systems have got much consideration for use in recent wireless and mobile communications because of their high data-carrying capabilities, ease of fabrication, and cost-efficiency [1]
Mutual coupling between individual radiating antennas is the main drawback with MIMO antenna systems which is dependent upon relative positions of the antenna elements i.e. the spacing between the elements
This paper presents the design of a novel compact MIMO antenna, operating in the UWB band with a much lower mutual coupling (S12/S21 < -25dB) among its constituent patch antennas
Summary
Wideband antenna systems have got much consideration for use in recent wireless and mobile communications because of their high data-carrying capabilities, ease of fabrication, and cost-efficiency [1]. The resulting multi-period EBG structure made by this method will remain uni-planer and attract filter designers [16] Another small size UWB MIMO antenna with the dimensions of 25 × 25 ×1.6 mm, having cross shaped isolated ground stub and operating in 2.97-13.8GHz frequency band, is presented in [17]. A combination of ground stub in bottom layer and an EBG structure in between the two rectangular patches in the top layer were used, resulting in very low mutual coupling among the two radiating patches This antenna works in a wide frequency band of 3.1 to 11GHz and is a suitable candidate for use in WLAN, 5G (sub 6 GHz band), and satellite communications. The fabricated antenna has been tested for various parameters such as scattering parameters and radiation patterns, and a close resemblance is observed in experimental and simulated results
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