Abstract
In the paper, an extremely compact multiple-input-multiple-output (MIMO) antenna is proposed for portable wireless ultrawideband (UWB) applications. The proposed prototype consists of four monopole antenna elements, which are placed perpendicularly to achieve polarization diversity. In addition, the mutual coupling between antenna elements is suppressed by designing the gap between the radiation element and the ground plane. Moreover, a matching stub has been connected to the feedline to ensure impedance matching in high frequency. Both simulated and measured results indicate that the proposed antenna has a bandwidth of 3–20 GHz, with a high isolation better than 17 dB. In addition, the designed MIMO antenna offers excellent radiation characteristics and stable gain over the whole working band. The envelope correlation coefficient (ECC) is less than 0.1, which shows that the antenna can meet the polarization diversity characteristics well.
Highlights
Introduction10.6 GHz) for commercial applications but limits the power transmission to low levels [1]
These results reveal that the designed antenna fulfill the requirement of achieving smaller envelope correlation coefficient (ECC) and larger Diversity gain (DG) at the same time
A novel 4-element UWB-MIMO coplanar waveguide (CPW)-fed antenna has been proposed with a compact size of only 38 × 38 × 1.6 mm3
Summary
10.6 GHz) for commercial applications but limits the power transmission to low levels [1]. A compact 4-element MIMO antenna has been proposed for portable wireless UWB applications with a wide frequency band that extends from 3.1 to 12 GHz [15]. A novel UWB-MIMO antenna system with high isolation has been proposed with a frequency range of 2.9 to 40 GHz and a mutual coupling that is less than. A compact UWB 4-element MIMO antenna with high isolation is proposed. To the best of authors’ knowledge, the novelty of this work is the size of whole antenna is extremely compacted designed in the working frequency band extends from 3.1–20 GHz. the 4 antenna elements allow for a significant increase in channel capacity compared to the 2 elements design. A prototype has been built and measured with close agreement between experimental and simulated results
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