Eight-Band Antenna for Full-Screen Metal Frame LTE Mobile Phones

This paper presents an eight-band antenna for full-screen metal frame LTE mobile phones with a size of 142 mm ×79 mm ×7.5 mm. The proposed antenna mainly consists of two monopole branches, a match circuit, and two ground branches. The two monopole branches and the match circuit are used to cover the lower band (698-960 MHz) and part of the higher band (1710-2690 MHz). One of the two ground branches is used to cover the other part of the higher band, and the other is mainly used to make the lower band matched. The merit of the proposed antenna is that eight bands can be realized under the conditions of an only 2 mm ground clearance and a metal frame; it is very suitable for full-screen metal frame mobile phones. A prototype is manufactured and measured. The measured-6 dB impedance bandwidths are 300 MHz (665-965 MHz) at the lower band and 1190 MHz (1610-2800 MHz) at the higher band. The LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, and LTE2500 bands are covered. The measured efficiency is bigger than 42%, so it is practical for mobile phone applications.