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8-Port Semi-Circular Arc MIMO Antenna with an Inverted L-Strip Loaded Connected Ground for UWB Applications
Addepalli, T. Desai, A. Elfergani, Issa T. Anveshkumar, N. Kulkarni, J. Zebiri, C. Rodriguez, J.
Addepalli, T.
Desai, A.
Elfergani, Issa T.
Anveshkumar, N.
Kulkarni, J.
Zebiri, C.
Rodriguez, J.
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Publication Date
2021-06, 2021-06
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© 2021 The Authors.This is an Open Access article distributed under the Creative Commons CC-BY license (https://creativecommons.org/licenses/by/4.0/)
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2021-06-17
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Abstract
Multiple-input multiple-output (MIMO) antennas with four and eight elements having connected grounds are designed for ultra-wideband applications. Careful optimization of the lines connecting the grounds leads to reduced mutual coupling amongst the radiating patches. The
proposed antenna has a modified substrate geometry and comprises a circular arc-shaped conductive
element on the top with the modified ground plane geometry. Polarization diversity and isolation are achieved by replicating the elements orthogonally forming a plus shape antenna structure. The
modified ground plane consists of an inverted L strip and semi ellipse slot over the partial ground
that helps the antenna in achieving effective wide bandwidth spanning from (117.91%) 2.84-11 GHz. Both 4/8-port antenna achieves a size of 0.61 λ × 0.61 λ mm2 (lowest frequency) where 4-port antenna is printed on FR4 substrate. The 4-port UWB MIMO antenna attains wide impedance bandwidth, Omni-directional pattern, isolation >15 dB, ECC 4.5 dB making the MIMO antenna suitable for portable UWB applications. Four element antenna structure is further extended to 8-element configuration with the connected ground where the decent value of IBW, isolation, and ECC is achieved.
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Citation
Addepalli T, Desai A, Elfergani IT et al (2021) 8-Port Semi-Circular Arc MIMO Antenna with an Inverted L-Strip Loaded Connected Ground for UWB Applications. Journal of Electronics. 10(12): 1476.
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