2.4GHz-band high power and high efficiency solid-state injection-locked oscillator using imbalanced coupling resonator in feedback circuit

A 2.4GHz-band high power and high efficiency injection-locked oscillator has been developed for use in the microwave ovens having uniform heating as well as subtle temperature control. With the use of the imbalanced coupling resonator in the feedback circuit, an output power of 210W and an efficiency of 51% have been successfully obtained at 2.45GHz, where a reference signal of less than 1/10,000 has been injected. The high power and high efficiency solid-state injection-locked oscillators presented in this paper has an advantage in long life, frequency and phase controllability, and low voltage operation, which can be useful for realizing an accurate temperature control in chemical reactions as well as the spot and uniform heating of microwave ovens.