The effect of stacked U-slot patch on the radiation parameters of rectangular U-slot microstrip antenna

The single layer U-slot rectangular patch antenna has been found to provide impedance bandwidth of about 30% [1]. A bandwidth of up to 40% is obtained with a U-slot patch antenna stacked with a parasitic patch [2]. In this paper the effect of second U-slot stacked with the same geometry is presented, Fig. 1. A bandwidth as high as 46% is obtained.