A planar GPS/GLONASS/LTE/WWAN antenna for ultra-slim smartphones

A small size, planar dual wideband antenna for smartphone applications is proposed. The proposed antenna supports the multiple communication protocols including the GPS/GLONASS, DCS, PCS, UMTS2100, Bluetooth LTE2300/2500/3400 and 2.4-GHz WLAN and WiMAX 2.3/2.5/3.5GHz bands. The planar antenna is printed on 0.8mm thick FR-4 substrate and occupies the area of 30.5×9.2mm2. The antenna comprises of a directly fed inverted L-shaped feeding strip, branch strip coupled to feeding strip with inductor, a inductively loaded shorted strip, and a matching circuit. In order to validate the simulation results, the designed prototype of antenna is successfully fabricated and experimentally measured.