Phase Variations and Phase Shift in a TE011 Mode Microwave Cavity Used for in a Miniature

Phase Variations and Phase Shift in a TE011 Mode Microwave Cavity Used for in a Miniature Rb

Fountain Frequency Standard

BIANFenggang;JIANGHaifeng;WEIRong;ZHOUShanyu;WANGYuzhu

【期刊名称】《电子学报：英文版》 【年(卷),期】2005(014)002

【摘要】It is the first time in China that the phase variations and phase shift of microwave cavity in a miniature Rb fountain frequency standard are studied, considering the effect of imperfect metallic walls. Wall losses inthe microwave cavity lead to small traveling wave components that deliver power from the cavity feed to the walls of cavity. The small traveling wave components produce a microradian distribution of phase throughout the cavity, and therefore distributed cavity phase shifts need to be considered. The microwave cavity is a TE011 circular cylinder copper cavity, with round cut-hole of end plates (14mm in diameter) for access for the atomic flux and two small apertures in the center of the side wall for coupling in microwave power. After attenuation a is calculated, field variations in cavity are solved. The field variations of the cavity are given. At the same time, the influences of loaded quality factor QL and diameter/height (2a/d) of the microwave cavity on the phase variations and phase shift are considered. According to the phase variation and phase shift of microwave cavity we select the parameters