An Octa-Band Antenna for LTE Mobile Handsets without Ground Clearance

An octa-band antenna for LTE mobile handsets without ground clearance is proposed and studied. The total size of the mobile phone is 141mm×79mm×7.5mm. The proposed antenna consists of two monopole branches, a match circuit and two open slots. With the help of the match circuit, the two monopole branches are used to produce the main working modes at the lower band (698-960MHz) and the higher band (1710-2690MHz). One of the slots is used to produce a new resonant frequency at the higher band, and the other slot is used to make the lower band matched. The simulated -5 dB impedance bandwidth at the lower band is 268MHz (695-963MHz) and the simulated -6dB impedance bandwidth at the higher band is 1300MHz (1700-3000MHz). The LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, and LTE2500 bands are covered. The simulated efficiencies are 50-76% and 63-91% at the lower and higher bands, respectively.