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小型化是目前氢钟的发展方向之一。氢钟的小型化主要是谐振腔的改进，它的结构尺寸决定了氢钟的最小尺寸和重量。目前采用的小型腔主要有电极负载腔、磁控管腔、介质负载腔和ＴＥ１１１腔。新型的谐振腔虽然减小了体积减轻了重量，但是由于它本身已经很难满足起振条件，所以在伺服电路上也不同于主动型氢钟。根据电路原理的不同，将小型化的氢钟分为反馈振荡型和被动型。反馈振荡型氢钟使激射器工作在反馈振荡状态，通过正反馈维持激射器振荡。被动型氢钟的激射器工作在振荡阈值之下，其作用与谐振放大器相似。
Miniaturization is one of the development directions of the current hydrogen bell. The miniaturization of the hydrogen bell is mainly the improvement of the resonant cavity, and its structure determines the minimum size and weight of the hydrogen bell. Currently used in small cavity electrode load chamber, the magnetron cavity, the dielectric load chamber and TE111 cavity. Although the new type of resonator reduces the volume and lightens the weight, it is different from the active type hydrogen clock on the servo circuit since it can hardly satisfy the starting condition. According to the different circuit theory, the miniaturization of the hydrogen clock is divided into feedback oscillation and passive type. The feedback oscillating hydrogen bellows the lasers to work in a feedback oscillating state, and the lasers are oscillated through positive feedback. Passive hydrogen bellows operate below the oscillation threshold and function similarly to resonant amplifiers.