1) The document discusses a nonlinear microwave oscillator system that can exhibit chaotic behavior based on a time-delayed feedback loop architecture operating in the 2-4 GHz frequency band. 2) It presents the experimental setup of the system using a voltage controlled oscillator (VCO), splitter, mixer, and delay line. Mathematical models are developed to simulate the system dynamics. 3) Experiments show the system can transition from periodic to chaotic behavior as a nonlinearity parameter is increased. Synchronization is also achieved by bidirectionally coupling two similar microwave oscillator systems.