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A small‐size reconfigurable smartphone antenna using a PIN diode for WWAN/LTE and global navigation satellite system (GNSS) smartphone application is presented. When the diode is in ‘OFF’ state, a T‐shaped feeding strip and an encircled T‐shaped parasitic shorted strip formed a coupled‐fed antenna, which achieves a low‐wideband covering GSM850/900 bands and a high‐wideband covering GSM1800/1900/UMTS2100/LTE2300/2500 bands. When the diode is in ‘ON’ state, a loop antenna working at 1/2 wavelengths is formed to cover the bands of GNSS, which includes four positioning systems (COMPASS, GALILEO, GPS and GLONASS). In addition, the proposed antenna is easily printed on a small ground clearance of 375 mm 2 without loading any lumped element. Also, the proposed simple and compact antenna is convenient to be optimised for desired bands. Finally, the good agreement of simulated and experimental results proves that the proposed antenna is suitable for practical mobile terminal equipment.
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Xu et al. (2017) studied this question.
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