Abstract
This paper presents a compact planar multiple input multiple output (MIMO) antenna for super wide band (SWB) applications. The presented MIMO antenna comprises two identical patches on the same substrate. Dimensions of the MIMO antenna are 0.17λ × 0.20λ × 0.006λ mm3, with respect to the lowest resonance of 1.30 GHz. The SWB antenna was manufactured using F4B substrate having a dielectric constant of 2.65 that provides a percent impedance bandwidth and bandwidth ratio of 187% and 30.76:1, respectively. The mutual coupling between the antenna elements is suppressed by placing a T-shaped corrugated strip in the mid of two antenna elements. The proposed MIMO antenna exhibits maximum diversity gain of 10 dB, low mutual coupling (<−20 dB), low envelope correlation coefficient (ECC < 0.02), efficiency >80%, and low reflection coefficient (<−10 dB) in the SWB frequency range (1.30 GH–40 GHz). The presented antenna is a good candidate for SWB applications. The designed antenna has been experimentally validated, and the simulated results were also verified.
Highlights
In advanced wireless communications, extremely wideband antennas have gained rising popularity because of their low manufacturing cost, high data rate, convenient design, and provision of wide-range of resonance frequencies
The previously designed multiple input multiple output (MIMO) antennas operate within the UWB band (3.1 GHz–10.6 GHz) and they possess large electrical dimensions, low %BW, and high lowest resonance frequency
To best of our knowledge very few highly isolated MIMO antennas with lowest resonance frequency of 1.3 GHz and highest resonance frequency of 40 GHz has been designed for super wide band (SWB) application
Summary
Extremely wideband antennas have gained rising popularity because of their low manufacturing cost, high data rate, convenient design, and provision of wide-range of resonance frequencies. The previously designed MIMO antennas operate within the UWB band (3.1 GHz–10.6 GHz) and they possess large electrical dimensions, low %BW, and high lowest resonance frequency. The designed MIMO antenna in [21] operates within UWB frequency band and has electrical dimensions of 0.41λ × 0.25λ mm. F-shaped stubs in the shared ground plane [21], utilizing the defected ground structures [28] and by placing the antenna elements perpendicularly to each other [29] All these techniques have been employed to reduce coupling in the range 3.1 GHz–10.6 GHz. Further, mutual coupling reduced by metamaterial in [30,31,32,33,34,35,36,37,38,39] and [40,41,42,43]. To best of our knowledge very few highly isolated MIMO antennas with lowest resonance frequency of 1.3 GHz and highest resonance frequency of 40 GHz has been designed for SWB application
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