Coupled-fed PIFA with a loop feed for 8-band internal LTE/WWAN laptop computer antenna

Owing to the LTE (long term evolution) which can provide much higher data rate than the existing GSM and UMTS mobile networks, the internal antenna that can cover LTE/WWAN operating bands is preferred for the modern mobile communication device. All the 8-band LTE/WWAN operating bands include: three LTE bands in the LTE700 (698~787 MHz), LTE2300 (2300~2400 MHz) and LTE2500 (2500~2690 MHz), four GSM bands in the GSM850 (824~894 MHz), GSM900 (880~960 MHz), GSM1800 (1710~1880 MHz) and GSM1900 (1850~1990 MHz), and one UMTS band (1920~2170 MHz). Although there are some small-size 5-band WWAN laptop computer antennas published [1]-[5], they generally cannot satisfy the 8-band LTE/WWAN operation. In this paper, we present a promising internal laptop computer antenna with an acceptable size of 80 × 10 × 4 mm3 for practical applications. The proposed antenna is a coupled-fed PIFA with a loop feed; it can generate two wide resonant modes in the lower and upper bands to cover the desired 8-band LTW/WWAN operation.