A compact, wideband and low profile planar inverted-L antenna

This paper presents a modified planar inverted-L antenna (PILA) for mobile handset applications. The proposed antenna has a low profile with a wide bandwidth. It covers most of cellular mobile system frequency bands, such as 2G systems DCS 1800 (1710-1880 MHz) and PCS 1900 (1850-1990 MHz), 3G system likes UMTS (1920-2170 MHz), it is also compatible with 4G systems (LTE and LTE-Advanced between 1700 MHz and 2700 MHz). Furthermore, WiFi (2400-2448 MHz), Bluetooth and S-DMB frequency bands are also covered by this design. This antenna comprises a small top plate which is fed by a feeding strip and a modified ground plane which plays an important role in changing the strong capacitive electric field between the top plate and the ground plane. To widen the lower frequency to 1700 MHz, the top plate is also modified, and excellent results have been obtained.