Analysis on resonant characteristic for TE0 mode of complicated microwave cavity in rubidium standard

Microwave cavity with complicated structure and rubidium gas is studied by mode matching method. By deducing eigen equation and calculating resonant frequency of TE₀ mode, main factors that influence resonant frequency is studied. In addition, the resonant frequency of TE₀ mode is compared with commercial software (CST) results. The computed results show good agreement with CST simulations. It can be seen that this method is of high credibility and efficiency. This paper is of great significance for cavity design and theoretical perfection.