Orugu R, Gundapaneni S, Maryleena N, K.Chaithanya Varma A. Varying operating frequency of concentric circular ring patch antenna using high impedance surface. IJET [Internet]. 2018 Aug. 24 [cited 2024 Nov. 24];7(3.29):57-60. Available from: https://sciencepubco.com/index.php/ijet/article/view/18461