期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 28, 期 1, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2017.2773836
关键词
Microstrip; NbTi; Superconducting cables; Superconducting microwave devices
资金
- Japanese Society for the Promotion of Science-JSPS [26220704]
- National Science Foundation-NSF (ATI) [AST-1308556]
- National Aeronautics and Space Administration-NASA [NNX16AE98G]
- Direct For Mathematical & Physical Scien [1308556] Funding Source: National Science Foundation
Large arrays of superconducting devices such as microwave kinetic inductance detectors require high density interconnects from higher temperatures with minimal heat load, low loss, and negligible crosstalk capable of carrying large and overlapping bandwidth signals. We report the fabrication of superconducting 53 wt% Nb-47 wt% Ti (Nb-47Ti) microstrip transmission lines laminated onto flexible polyimide substrates with lengths up to 40 cm and up to ten traces. The 50 Omega traces terminate in G3PO coaxial push-on connectors. We found transmission losses of 2.5 dB and a nearest-neighbor forward crosstalk of -25 dB at 8 GHz on a typical 5 trace, 1.8-cm-wide, 0.198-mm-thick, 22-cm-long flex cable at 30 mK. A simple two-port analytical model and subsequent Sonnet simulations indicate that this loss is mainly due to a complex impedance mismatch from wirebonds at the end connector without which the insertion loss would be <2.7 dB/m. This is about six times worse than the transmission measured in Coax Company, Ltd.'s smallest (circle divide 0.86 mm) Nb-47Ti coaxial cables, possibly from differences in the low temperature loss properties of polyimide laminates versus PTFE or from unaccounted resistive losses in the copper adapter coaxes of our tested device. Heat flow calculations from literature data show that the 0.198-mm-thick flex cables tested have roughly equivalent thermal conductance per trace below 4 K compared to the circle divide 0.86 mm Nb-47Ti coaxial cables.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据