Enhanced Gain Open-ended Waveguide Antenna using a Circular Substrate Disk

This work presents the gain enhancement technique of a conventional open-ended waveguide (OEWG) by using a circular dielectric substrate disk backed by a thin, perfect electric conductor (PEC) sheet along with PEC rings on the front side. This technique is applied on a commercially available WR-28 waveguide to enhance its gain from 5.62 dBi to 19.45 dBi at a frequency of 26 GHz. To validate this approach, the simulations and optimizations of the OEWG antenna are carried out using the full-wave simulator, Ansys HFSS.