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A subminiature microwave cavity for rubidium atomic frequency standards has been developed. The cavity has volume of 8.1 cm3, and is of strong resonant signal with high Q factor. Based on the cavity a small size cavity-cell assembly with volume of 9.5 cm3 for rubidium frequency standards has been developed. A preliminary test showed that the cavity-cell assembly is of ability to achieve a short-term frequency stability of 3times10-11/radictau.