This work presents design of circulators using active elements like transistors. Metamaterial based structure consisting of ring resonators loaded with FET's is used to make the circulator design with nonreciprocity. The proposed work deals with two designs, the first circulator shows its operation at 6 GHz that can be used for Wi-Fi 6E communications. The second design which is an extension of the first one acts like a Tri-band circulator having resonances at 1.3 GHz, 3.2 GHz and 5.9 GHz. The circulator demonstrates simulated insertion loss of 3.8 dB, isolation of better than 10 dB and matching of > 22 dB at 5.9 GHz. The proposed circulator can be used for both Wi-Fi 6E and WiMAX applications. © 2022 IEEE.