Abstract
This paper presents a compact, bouquet-inspired, four-element MIMO array for super wideband (SWB) applications. The proposed unit element monopole antenna has compact geometry, and it is deployed by the fusion of an elliptical and circular-shaped radiator. The convoluted geometry and semi-elliptical ground plane, along with the narrow rectangular slit defected ground structure, provides a wide impedance bandwidth. The designed unit cell has the dimensions of 32 mm × 20 mm × 0.8 mm, operates from 2.9 to 30 GHz (S11 ≤ −10 dB) and provides a bandwidth dimension ratio (BDR) of 2894. The proposed low-profile diversity array without any decoupling structures consists of four orthogonally placed, uncorrelated antennas with an inter element spacing of 0.05 λ0, occupies an area of 57 mm × 57 mm and provides dual polarization. The performance metrics of the diversity array were validated for frequencies over ultra-wideband, using mutual coupling characteristics, envelope correlation coefficient (ECC) by far-field radiation, diversity gain (DG), total active reflection coefficient (TARC), channel capacity loss (CCL) and cumulative distribution function (CDF) analysis. The measured mutual coupling over the operating band was less than −18 dB, the ECC was less than 0.004 and the TARC was less than −15 dB, and a better CCL of ˂0.28 bits/s/Hz was achieved by the fabricated antenna.
Highlights
Planar monopole antennas provide many advantages, from the low profile to a cost-effective prototype, depending upon the choice of substrate, as well as a wide bandwidth and nearly omnidirectional radiation characteristics
Due to its limited ratio bandwidth, it can support only a restricted number of wireless systems. This limitation can be avoided by deploying super wideband (SWB) antennas, which offer a minimum of a 10:1 ratio bandwidth
Itbe can be seen the mutual coupling among elements was less than for the entire operating frequency range
Summary
Planar monopole antennas provide many advantages, from the low profile to a cost-effective prototype, depending upon the choice of substrate, as well as a wide bandwidth and nearly omnidirectional radiation characteristics. Most of the reported monopole antennas have usual layouts, such as squares, circles and ellipses, and achieve an impedance bandwidth ratio of 4:1 to. As indicated in [2,3], existing ultra-wideband (UWB) antennas can provide an impedance ratio bandwidth of 3.4:1 (3.1 to 10.6 GHz, Federal Communications Commission (FCC) standards). Due to its limited ratio bandwidth, it can support only a restricted number of wireless systems. This limitation can be avoided by deploying super wideband (SWB) antennas, which offer a minimum of a 10:1 ratio bandwidth. SWB antennas have wide coverage bandwidths which cover both short- and long-range communications. The reported compact monopole antenna [4] for SWB applications operates from
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