A compact square-ring printed monopole ultra wideband antenna

A simple and compact microstrip-fed ultra wideband (UWB) printed monopole antenna is proposed in this paper. The antenna is composed of a square ring and occupies about 7.91GHz bandwidth covering 3.09–11GHz. The experimental and simulated results exhibit good agreement. The characteristics of the proposed antenna are analyzed, and the geometry parameters for optimal performance are also investigated in detail. A quasi-omnidirectionally and quasi-symmetrically radiation pattern in y-z plane is obtained. The results measured or simulated validated that the antenna satisfies the requirements of UWB communications, and will be a good solution for UWB applications.