A 3d Printed Metallized Fabry-Perot Cavity Antenna With Improved Bandwidth And Low Side-Lobe Levels

A 3D printed metallized Fabry-Perot cavity antenna centred at 5.8 GHz is presented in this letter. A non-uniform grid superstrate and a choke groove are employed in the Fabry-Perot cavity antenna to improve the input bandwidth and decrease the side lobes. By using the non-uniform superstrate, the |S-11| <- 10 dB bandwidth is enhanced to approximately 6.4% (from 5.65 to 6.02 GHz). The side lobes decrease to -14.03 and -21.62 dB on E and H planes by the choke groove. The designed antenna is fabricated by using a stereolithography-based 3D printing technique for verification, whose weight is only 13% of the one fabricated with copper. The measured result agrees well with the simulated one.