In this paper, a stacked ring-patch two layer planar artificial substrate is analyzed numerically and is shown to possess the properties of a high impedance surfaces (HIS). Its properties are evaluated by investigating the surface wave propagation and plane wave reflection characteristics. Its application to reduce the mutual coupling of microstrip antennas and to improve the radiation pattern ...

A new antenna structure with lower side lobe pattern and higher gain was designed by combining a microstrip rectangular planar antenna array with the separated feed network technique. In this paper, the side lobe behaviors of two different radiating structures have been studied and compared. The first antenna configuration (“Structure 1”) is a 16-element planar antenna array whose feed line is ...

After the release of the unlicensed Ultra Wideband (UWB) spectrum 3.1 GHz to 10.6 GHz for the commercial purposes by the Federal Communications Commission (FCC), industries and academia pay much attention due to its properties of excellent immunity to multi-path interference, high secured data rate, low power consumption, and simple configuration. The feasible UWB antenna design face some chall...