High-Efficiency Single-Layer Planar Ultra-Wideband Antenna

A low profile, single layer, light weight ultra-wide band (UWB) antenna is introduced in this work. The design method depends on a main (primary) printed patch capacitively coupled to secondary parasitic patches. The whole design dimensions are 35 × 39.4 × 0.5 mm. The main patch is fed with coplanar waveguide (CPW). The main patch is constructed as a perforated circle with four quarter-circle sector holes over a roger RO3003 substrate with real permittivity εr = 3 and height h = 05m 0.5 mm. The parasitic elements are six equal small circles coupled to the primary patch through a gap. The whole antenna structure and the CPW feed line are printed on the same side of the substrate and the other side has no conductor (no ground plane). The antenna is fabricated and its parameters are measured experimentally. The reflection coefficient, radiation pattern and radiation efficiency are measured within the antenna operating band 2.9 –10.7 GHz. The measurements and the electromagnetic simulations are compared showing good agreement.