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Enhanced-Performance Circularly Polarized MIMO Antenna with Polarization/Pattern Diversity

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Design of a compact wideband circularly polarized (CP) multiple-input multiple-output (MIMO) antenna with polarization diversity is proposed and characterized for off-body communication. The antenna is based on a simple coplanar waveguide (CPW)-fed monopole extension of the microstrip line. The orthogonal field components required by CP are induced using a simply modified right/left side ground plane. In particular, a stub extending from the ground plane along the length of the microstrip line generates the vertical component, whereas the current along the width of the ground plane contributes to the horizontal components. To obtain a unidirectional radiation pattern in the off-body direction and to reduce the sensitivity to the human body loading effects, a flat reflector printed on a high permittivity flexible substrate is applied. The simple topology of the antenna can be described by a few adjustable parameters, which facilitates its EM design closure. Prior to the experimental validation in the free space and on the body, the antenna is optimized at the full-wave level of description for all major performance figures. The overall footprint of the antenna radiator is only Ls × Ws = 0.24 λ0 × 0.64 λ0 = 0.15 λ02. The proposed MIMO antenna features |S11|≤ -10 dB, average isolation |S21|≤ -22 dB, and axial ratio (AR)and axial ratio 3 dB from 5.2 GHz to 6.3 GHz with 100% bandwidth overlap between the impedance and axial ratio bandwidths. The envelope correlation coefficient (ECC) is less than 0.004 with the maximum diversity gain (DG) of approximately 9.99 dB. Moreover, the antenna maintains a high efficiency of up to 90% when loaded on the body, and a low specific absorption rate (SAR).

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Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
IEEE Access nr 8, strony 11887 - 11895,
ISSN: 2169-3536
Język:
angielski
Rok wydania:
2020
Opis bibliograficzny:
Ullah U., Mabrouk I., Kozieł S.: Enhanced-Performance Circularly Polarized MIMO Antenna with Polarization/Pattern Diversity// IEEE Access -Vol. 8, (2020), s.11887-11895
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1109/access.2020.2966052
Bibliografia: test
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  35. J. Nocedal and S. Wright, Numerical Optimization, 2 nd edition, Springer, New York, 2006. UBAID ULLAH received the M.Sc and PhD degree in electrical and electronic engineering from the Universiti Sains Malaysia, in 2013 and 2017, respectively. During his PhD, he was awarded the prestigious global fellowship and the outstanding student award. He was with Engineering Optimization & Modeling Center, School of Science and Engineering, Reykjavik University, Iceland from late 2017 to early 2019. He is currently affiliated with Al Ain University, Abu Dhabi, United Arab Emirates. His research interest includes antenna theory, small antennas, antenna polarization, dielectric resonators, waveguides, millimeter-wave antenna designs, multiple-input multiple- output (MIMO) antenna system, EM-simulation-driven design, numerical analysis, microwave circuit design and optimization.
Weryfikacja:
Politechnika Gdańska

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