Prediction of radiation-induced frequency locking and shifting in a microwave oscillator

In this paper, an effective and efficient approach is proposed to evaluate the frequency shifting and locking degradation in a microwave oscillator, illuminated by an incident plane wave. The analysis is performed by using equation-based equivalent sources embedded in the circuit schematic and incorporating the harmonic balance (HB) simulator. Most importantly, an auxiliary source is added in the simulation under the non-perturbation condition to search for the non-trivial solutions. A 795-MHz oscillator is created and simulated by this approach. The circuit performance measured inside an anechoic chamber is compared to the simulation with good agreement.