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• W4290717178 abstract "Radiation efficiency is one of the key parameters for smartphone antennas. However, the actual mechanism governing radiation efficiency remains unclear, and a few works have been published. This work is an attempt to extend the theory of characteristic modes (TCMs) to the lossy smartphone antenna for gaining insight into what causes efficiency variation and realizing efficiency improvement. Compared with the classical TCM, the CM analysis (CMA) adopted in this work has the capacity to handle lossy smartphone antenna. By using such an analysis approach, we find, quite interestingly, that suppressing the higher-order modes is an effective optimization strategy to enhance efficiency. Then, an optimized antenna with considerable improvement in efficiency is proposed. Finally, to meet the requirement of practical application, the additional LC circuit and through holes are introduced into this proposed optimized antenna. GSM 900 of 890–960MHz can be covered by this finally proposed antenna, and the measured peak total efficiency is improved from 26% to 43%. Due to the attractive features of small heights (4 mm) and tiny clearances (0.25 mm), the proposed designs are promising for application in a smartphone with a full-view display and thin profile." @default.
• W4290717178 created "2022-08-09" @default.
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• W4290717178 date "2022-11-01" @default.
• W4290717178 modified "2023-10-16" @default.
• W4290717178 title "Efficiency Improvement of Smartphone Antennas Using Higher-Order Mode Suppression Under Characteristic Mode Analysis" @default.
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• W4290717178 doi "https://doi.org/10.1109/tap.2022.3195537" @default.
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