Highly Efficient Ultra-Wideband Planar Folded Dipole Antenna for Mobile Applications

A compact ultra-wideband (UWB) planar folded dipole antenna (PFDA) for mobile UWB terminal is presented in this paper. The proposed PFDA is mainly composed of two folded radiating elements and two pairs of parasitic elements. Each radiating element consists of two copper strips, and a rectangular slot is etched on the strip. The dimensions of the proposed PFDA are $17\ \mathbf{mm}\ \times 5\ \mathbf{mm}\ \times 1.27\ \mathbf{mm}$. Optimizing the design parameters of the antenna results in an impedance bandwidth of 56.4%, covering a wide range from 5.6 GHz to 10 GHz. Particularly more than 89% total efficiency can be realized in the band of 6–9 GHz.