Resonant properties of complicated microwave cavity with ceramic material for new type of rubidium clock

Abstract

Resonant properties of a cylindrical microwave cavity with ceramic material for a new type of rubidium clock are studied by mode matching method. The microwave cavity works at a certain frequency such as 6·835 GHz by accommodating a glass bubble containing rubidium vapour. To make electromagnetism focus on the centre of the cavity and further miniaturise the cavity to a large extent, a ceramic dielectric ring is installed in the inner layer of the glass bubble. In order to study the main factors of influencing resonant characteristics, resonant frequencies of TE011 mode are calculated and compared with simulated results. The results show that theoretical computations are in good agreement with simulations. In addition, the effects of the ceramic material and rubidium vapour on resonant frequency are analysed. This work is of great significance for cavity design and theory perfection in atomic clock.