Multipactor Breakdown Threshold Estimation Based on Circuital Models and Particle Simulations for Multicarrier Signals in RF Filters

Multipactor is a harmful effect that may challenge the correct operation of satellite communication systems by limiting the system power-handling capability, and hence its overall performance. Therefore, the development of techniques for predicting the multipactor threshold is of great practical interest. For narrowband components, rough estimations can be obtained from experimental charts, normally resulting in conservative thresholds. More accurate predictions can be obtained with particle simulators, at the expense of a much higher computational effort. This study proposes an approach based on circuital models for swift and accurate multipactor threshold predictions, specifically addressing short-term discharges induced by multicarrier signals in narrowband samples. The use of reduced, but representative, electromagnetic (EM) models of the critical gap region is discussed in detail. Through the use of these models, it is possible to avoid simulating the complete structure, increasing the computational efficiency and enabling the fulfillment of the power requirements at early design stages. The proposed technique is validated through commercial particle simulators, showcasing its efficacy, efficiency, and key benefits.