An eight-band printed antenna with a T-shaped feeding line coupled to a parasitic inverted-F structure is presented. The antenna provides bandwidth to cover low band of LTE700/GSM850/GSM900 and high band of GSM1800/GSM1900/UMTS2100 and LTE2300/2500. Low-band efficiency is over 50% and high-band efficiency is over 60%. This antenna also meets specific absorption rate in US and other regions. It occupies a small area of 17 × 58 mm2 and can be possibly integrated into compact mobile handset devices.
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Xie et al. (2014) studied this question.
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