A Reconfigurable LTE Full-Band Antenna for Smartphones With High Screen-to-Body Ratio

A frequency-reconfigurable antenna with a compact size of 32.5 × 4 mm
²
suitable for high screen-to-body ratio smartphones is proposed to work in the full LTE band of 698–960 MHz and 1710–2690 MHz. The antenna is physically realized on the metal frame by inserting gaps on the top of metal frame and introducing a shorting stub. The practical environment including the surrounding components and modules is fully considered throughout the antenna design process. The low and high frequency band of this antenna is achieved by activating four and six different SP4T switch states, respectively. The effect of the switch's position on the antenna performance is also investigated. The proposed antenna maintains radiation efficiencies higher than −7 dB at the low frequency band and higher than −5 dB at the high frequency band. The OTA results demonstrate the antenna can be a good candidate in smartphones.