Calculation and Design of Slotted-Tube Microwave Cavity Based on Big Data

Abstract

AbstractIn order to meet the application requirements of miniaturized high-precision rubidium atomic frequency standard, a miniaturized slotted-tube microwave cavity with volume of 11 mL was designed based on big data calculation and analysis. The direction factor of microwave field in microwave cavity is measured experimentally and the result is 0.83. Big data analysis and experimental calculation show that the magnetic field lines of the microwave field in the microwave cavity are evenly and densely distributed along the cavity axis, which can stimulate the microwave transition of high strength rubidium atoms. Based on this microwave cavity, we design a separation filter physical system. The miniaturized rubidium frequency standard physical system was designed by using the microwave cavity, and the desktop system of rubidium frequency standard was formed. We tested the short-term frequency stability of the system, and the results are better than 2 × 10–12/√τ, far higher than the general commercial miniaturized rubidium atomic frequency standard. Short-term frequency stability of the RAFS was measured and a short term stability of better than 2 × 10–12/√τ was obtained, suggesting that the cavity can be used to develop the RAFS with small size and high performance.KeywordsBig DataRubidium atomic frequency standardsSlotted-tube microwave cavityMiniatureHigh performance