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- W3040474423 abstract "Radiation in the normal direction for a metaloop antenna is discussed. First, the radiation field generated from an N-type current distributed along a loop, E <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>N</sub> , is investigated. The investigation clarifies the behavior of the unbalance between the left-handed circularly polarized (LHCP) component of E <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>N</sub> at frequency f <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>(-)</sub> and the right-handed circularly polarized (RHCP) component of EN at frequency f <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>(+)</sub> , where the loop circumference at these frequencies is one guided wavelength. Secondly, the radiation field generated from a C-type current, E <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>C</sub> , is investigated. The second investigation, when combined with the first investigation, leads to an inference that balanced radiation (and hence balanced gain) will be obtained when the N-type current over a certain region of the loop is replaced with a C-type current. Thirdly, to check this inference, a radiation field generated from a composite of the N-type and C-type currents, E <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>NC</sub> , is formulated. Using this formulation, the ratio of the gain for an LHCP wave to the gain for an RHCP wave, G <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>r</sub> , is derived. Fourthly, a metaloop antenna simulation model that has a balanced gain is created using practical N-type and C-type metaatoms that realize the composite current. Finally, a metaloop antenna is fabricated on the basis of the antenna simulation model. Measurements confirm that the fabricated metaloop antenna has a balanced gain in the normal direction. As supplementary data, the radiation pattern and VSWR of the fabricated metaloop antenna are also presented, together with the radiation efficiency and some comments." @default.
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- W3040474423 date "2020-01-01" @default.
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- W3040474423 title "Theoretical Investigation of Radiation in the Normal Direction for a Metaloop Antenna" @default.
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- W3040474423 doi "https://doi.org/10.1109/access.2020.3007505" @default.
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