Power delivered by an array of Van der Pol oscillators coupled to a resonant cavity

An array of Van der Pol oscillators coupled to an RLC load is considered both theoretically and experimentally. It is found that the oscillators are active when the capacitance of the capacitor coupling the array to the load is below a critical value increasing with the number of oscillators. The power delivered to the load by the array of active oscillators increases with the number of oscillators till a limiting value increasing with the quality factor of the load. Good agreement is obtained between the theoretical and experimental results.