Here, we report on a robust and efficient mechanism for tuning the microwave coupling of a Q-band (34 GHz), general purpose, cylindrical EPR cavity operating in the TE₀₁₁ mode. This novel mechanism allows for both the adjustment of the cavity’s coupling over a wide frequency range, as well as its bandwidth from that of a high-Q cavity (about 10 MHz), to a broadband cavity (above 1 GHz). The coupling element consists of a dielectric plate fixed onto a movable waveguide short that allows for two modes of operation. In the first mode, the dielectric plate does not influence the resonance properties of the coupling iris and allows for precise, critical coupling of the high-Q cavity. In the second mode, the dielectric plate is positioned in front of the coupling iris, varying the iris’ resonance properties and allowing very strong overcoupling to be achieved. This mechanism can be generalized for other types of EPR cavities, in particular at high microwave frequencies.

在这里，我们报告了一种稳健有效的机制，用于调谐在 TE _{011 中}运行的 Q 波段 (34 GHz)、通用、圆柱形 EPR 腔的微波耦合模式。这种新颖的机制允许在很宽的频率范围内调节腔的耦合，以及从高 Q 腔（约 10 MHz）到宽带腔（1 GHz 以上）的带宽。耦合元件由固定在可移动波导短路上的介电板组成，允许两种操作模式。在第一种模式中，介电板不影响耦合虹膜的谐振特性，并允许高 Q 腔的精确、临界耦合。在第二种模式中，电介质板位于耦合虹膜的前面，改变虹膜的谐振特性并允许实现非常强的过耦合。这种机制可以推广到其他类型的 EPR 腔，特别是在高微波频率下。