Orugu, Rangarao., Srilatha. Gundapaneni, N Maryleena, and A K.Chaithanya Varma. “Varying Operating Frequency of Concentric Circular Ring Patch Antenna Using High Impedance Surface”. International Journal of Engineering & Technology 7, no. 3.29 (August 24, 2018): 57–60. Accessed November 24, 2024. https://sciencepubco.com/index.php/ijet/article/view/18461.