Abstract
In this letter, a planar printed loop antenna which can cover eight bands of LTE (LTE2300/2500), WWAN (GSM850/900/DCS1800/PCS1900/UMTS2100) and LTE (LTE3500) in 5G communication is proposed for smartphone application. The antenna adopts the principle of coupled-fed, and its structure consists of a T-shaped feeding strip, a coupling bending shorted strip and a tuning line. To further attain good impedance matching for WWAN/LTE bands, a tuning line is used. In addition, the proposed antenna is very simple and compact, only occupying a size of 15 × 27 mm2, and the proposed antenna is very easy to be fabricated. Finally, from the measurement results, it shows over 40% of good antenna efficiencies in LTE/WWAN communication bands of 824MHz-960MHz, 1710MHz-2690MHz and 3300MHz-3600MHz.
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