Self-oscillating dual-ring active integrated antenna

By directly integrating an n-channel hetero-junction field effect transistor (FET) into a dual-ring radiator, a self-oscillating dual-ring active integrated antenna is proposed and demonstrated in this paper. The proposed active antenna, designed at 5.267 GHz, features an EIRP of 18.375 dBm, DC-to-RF conversion efficiency of 31.3%, and phase noise of -112.6 dBc/Hz at a 1-MHz offset from the carrier. With the aid of Agilent ADS and Ansoft HFSS, the oscillation frequency as well as the output oscillation power of the proposed dual-ring active antenna can be predicted. The design methodology, experimental setup, simulation and experimental results are discussed in this paper.