Abstract
An ultra-compact broadband antenna easily integrable on portable devices is presented. The antenna is composed of a printed rectangular radiating element and a C-strip printed as the ground plane on the other side. The overall antenna occupies a compact area of 56.5 x 2 x 0.5 mm(3), yet generating two resonant modes to form 39% (850MHz) wide impedance bandwidth from 1.75 to 2.6GHz with stable omni-directional radiation pattern with low cross-polarization.