Dwivedi, Ajay Kumar, et al. “Design of a Compact CPW-Fed Monopole Antenna With Asymmetrical Hexagonal Slot Loaded Ground Structure for C X Ku Band Applications”. Electrical, Control and Communication Engineering, vol. 16, no. 1, Jan. 2020, pp. 15-22, https://doi.org/10.2478/ecce-2020-0003.