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A multimode loop antenna with compact volume for mobile applications is presented in this paper. The loop antenna consists of a loop strip with a length of about 0.5λ. The loop strip is meandered to save space and bent to generate three traditional resonant modes, the 0.5-λ, 1-λ and 1.5-λ modes, and an additional higher mode, the 2-λ mode. The additional 2-λ mode is generated by adjusting the distance...
A folded loop antenna having a very compact size of ${\bf 5} \times {\bf 8} \times {\bf 60}\;{\bf m}{{\bf m}^{\bf 3}}$ with multiband operation for ultra-thin smartphone applications is proposed. The antenna generates four resonant modes, the traditional ${\bf 0}.{\bf 5}\hbox{-}{{\lambda }}$, ${\bf 1}\hbox{-}{{\lambda }}$, and ${\bf 1}.{\bf 5}\hbox{-}{{\lambda }}$ resonant modes and an extra higher-order...
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