亚吉赫频段下的低特性阻抗超导蝌蚪形谐振器
Low-characteristic-impedance superconducting tadpole resonators in the sub-gigahertz regime
AI总结：
本文提出一种名为蝌蚪形谐振器的超导器件设计，通过共面波导与平行板电容结合实现低特性阻抗，在亚吉赫频段下保持高品质因数和小尺寸，是实现与其他微波组件强电感耦合的理想候选者。
摘要：
我们展示了一种简单且通用的谐振器设计，该设计基于一段典型的共面波导短截线，其一端与地短路，另一端并联一个大型平行板电容器。由于该结构的形状，我们将其命名为蝌蚪形谐振器。该设计允许定制谐振器的特性阻抗，以特别适合需要低阻抗值的应用。我们展示了从 $Z_c = 2\\,Ω$ 到 $10\\,Ω$ 的特性阻抗范围，以及从 $f_0 = 290\\,\mathrm{MHz}$ 到 $1.1\\,\mathrm{GHz}$ 的频率范围，同时达到了约 $Q_{\mathrm{int}} = 8.5\times 10^3$ 的内部品质因数，这相当于用作平行板电容器介质的氧化铝的损耗角正切为 $\tan(δ) = 1.2\times 10^{-4}$。我们得出结论，这些蝌蚪形谐振器非常适合需要低频率和低特性阻抗的应用，同时在芯片上保持较小的占用面积。蝌蚪形谐振器的低特性阻抗使其成为实现与其他微波组件强电感耦合的有希望的候选者。
英文摘要：
We demonstrate a simple and versatile resonator design based on a short strip of a typical coplanar waveguide shorted at one end to the ground and shunted at the other end with a large parallel-plate capacitor. Due to the shape of the structure, we coin it the tadpole resonator. The design allows tailoring the characteristic impedance of the resonator to especially suit applications requiring low values. We demonstrate characteristic impedances ranging from $Z_c = 2\,Ω$ to $10\,Ω$ and a frequency range from $f_0 = 290\,\mathrm{MHz}$ to $1.1\,\mathrm{GHz}$ while reaching internal quality factors of order $Q_{\mathrm{int}} = 8.5\times 10^3$ translating into a loss tangent of $\tan(δ) = 1.2\times 10^{-4}$ for the aluminium oxide used as the dielectric in the parallel plate capacitor. We conclude that these tadpole resonators are well suited for applications requiring low frequency and low charactersitic impedance while maintaining a small footprint on chip. The low characteristic impedance of the tadpole resonator renders it a promising candidate for achieving strong inductive coupling to other microwave components.
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