Arrays of lumped-element kinetic inductance detectors (LEKIDs) optically coupled through an antenna-coupled transmission line are a promising candidate for future cosmic microwave background experiments. However, the dielectric materials used for the microstrip architecture are known to degrade the performance of superconducting resonators. In this paper, we investigate the feasibility of microstrip coupling to a LEKID, focusing on a systematic study of the effect of depositing amorphous silicon nitride on a LEKID. The discrete and spatially separated inductive and capacitive regions of the LEKID allow us to vary the degree of dielectric coverage and determine the limitations of the microstrip coupling architecture. We show that by careful removal of dielectric from regions of high electric field in the capacitor, there is minimal degradation in dielectric loss tangent of a partially covered lumped-element resonator. We present the effects on the resonant frequency and noise power spectral density and, using the dark responsivity, provide an estimate for the resulting detector sensitivity.

中文翻译：

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降低集总元素 KID 对两级系统效应的敏感性

通过天线耦合传输线光耦合的集总元件动感电感探测器 (LEKID) 阵列是未来宇宙微波背景实验的有希望的候选者。然而，已知用于微带结构的介电材料会降低超导谐振器的性能。在本文中，我们研究了微带耦合到 LEKID 的可行性，重点是系统研究在 LEKID 上沉积非晶氮化硅的影响。LEKID 的离散和空间分离的电感和电容区域允许我们改变介电覆盖程度并确定微带耦合架构的局限性。我们表明，通过仔细去除电容器中高电场区域的电介质，部分覆盖的集总元件谐振器的介电损耗角正切退化最小。我们介绍了对谐振频率和噪声功率谱密度的影响，并使用暗响应度提供了对所得探测器灵敏度的估计。