An eight‐band long term evolution/wireless wide area network (LTE/WWAN) mobile handset antenna using a wideband monopole antenna coupled with a chip‐inductor‐loaded shorted strip is presented. Two wide operating bands are obtained to cover the eight‐band LTE/WWAN operation in the 698–960 and 1710–2690 MHz bands. The antenna's lower band is contributed by the coupled shorted strip of length about 100 mm which is short‐circuited to the system ground plane of the mobile handset through a loaded chip inductor of 10 nH. The loaded chip inductor leads to dual‐resonant behavior of the excited resonant mode and greatly enhances the lower‐band bandwidth. The upper band is formed by a wide resonant mode generated by the wideband monopole antenna and a higher‐order resonant mode generated by the coupled shorted strip. The upper‐band bandwidth of larger than 1 GHz is hence obtained. With two wide bands obtained, the antenna can be disposed on the bottom edge of the main circuit board of the mobile handset with a small board area of 10 × 60 mm2. The specific absorption rate (SAR) values of the antenna for 1‐g head tissue are also well below the limit of 1.6 W/kg for frequencies over the operating bands.
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Chen et al. (2011) studied this question.
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