Coplanar Waveguide Antenna with Defected Ground Structure for 5G Millimeter Wave Communications

This paper introduces a novel compact antenna for the millimetre-wave (MMW) frequency range, having some ultra-wideband capability. The proposed antenna has been designed to target the 5
^th
generation operating bands ranging from 24GHz to 70GHz and can be considered as a potential candidate for 5G wireless networks. The designed antenna uses a microstrip patch structure, fed by coplanar waveguide (CPW); it shows excellent return loss performance in the 36 GHz band that is expected to be deployed for 5G mobile in the relatively near future, but it also has adequate return loss from 30 to 50 GHz and a potentially acceptable figure at the important 60 GHz oxygen-absorption band, which may be deployed later under 5G or the forthcoming sixth generation. The design is etched on high performance planar substrate, using a coplanar waveguide structure on the upper surface, but with a defected ground plane underneath.