A Tunable Multiband LTE Antenna for Metal Rimmed Smartphone Applications
In this paper, a tunable multiband LTE antenna is designed for metal rimmed smartphone applications. The antenna only uses a broken metal ring, which comprises an IFA (Inverted F antenna) section and a parasitic section, and generates three resonant modes through this layout for the feeding point and shorting point. In addition, loading a matching circuit at the feeding point and a RF switch at shorting point of the IFA is used to switch low frequency to lower frequency. The bandwidth can completely cover 824 960 and 1710 2690 MHz. So the proposed antenna can work at GSM850, 900; DCS1800; PCS1900; WCDMA band 1, 2, 4, 5, 8; TD SCDMA band 34, 39; CDMA BC0, BC1 and LTE band 1, 3, 7, 38, 39, 40, 41. Also, the total size of the cellphone is 150mm x 75mm x 3.5 mm, which is very suitable for 4G slim smart mobile phone applications.