Ultra-thin Rubidium Atomic Clock

The traditional rubidium clock is the most widely used in engineering, and its height is an important factor to be considered in many applications (such as the board-card-type device). Through the design of the ultra-miniature waveguide microwave cavity and separated spectrum lamp, our team has realized a kind of ultra-thin (with a height of 17.7mm), miniaturized, and high-performance traditional rubidium atomic clock. The physical size of the rubidium atomic clock is 76mm × 76mm × 17.7mm. This atomic clock is powered by the low voltage power of + 12V, the locking time is less than 3 min, the frequency stability is better than 3 × 10⁻¹¹/ \(\sqrt {\tau }\), the phase noise is better than −100dBc@10Hz, −140dBc@100Hz, −145dBc@1kHz, and −150dBc@10kHz, the frequency-temperature characteristic is better than 3 × 10⁻¹⁰ (under the ambient temperature range of −40°C to + 60°C), the frequency drift rate is better than 5 × 10⁻¹²/day. The product can be used in highly limited board-card-type time-frequency and synchronization devices.