Wideband Shorted Patch Antenna With a Modified Half U-Slot

A small wideband patch antenna with a modified half U-slot is presented. The antenna has an impedance bandwidth of 40%
$({ S}_{11}<-10\ {\hbox{dB}})$
, which is from 1.72 to 2.58 GHz. The antenna size is electrically and physically small, which is
$0.012\lambda_{0}^{2}$
and 240 mm
$^{2}$
, respectively. The proposed small antenna has good radiation characteristics, with a peak gain of 2 dBi. The proposed antenna is suitable for small wireless devices with the applications of Wi-Fi, Bluetooth, UMTS, GSM 1800, PCS 1900, and LTE.