用于微波测量的窄带低温滤波器。

Narrow bandpass cryogenic filter for microwave measurements.

作者信息

Ivanov B I, Klimenko D N, Sultanov A N, Il'ichev E, Meyer H-G

机构信息

Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany.

出版信息

Rev Sci Instrum. 2013 May;84(5):054707. doi: 10.1063/1.4807152.

DOI:10.1063/1.4807152

PMID:23742575

Abstract

An ultra-wide stopband hairpin bandpass filter with integrated nonuniform transmission lines was designed and fabricated for highly sensitive measurements at cryogenic temperatures down to millikelvin and a frequency range of 10 Hz-10 GHz. The scattering matrices of the filter were characterized at T = 4.2 K. The filter provides a stopband from 10 Hz to 2.2 GHz and from 2.3 GHz to 10 GHz with more than 50 dB and 40 dB of amplitude suppression, respectively. The center frequency of the passband is f0 = 2.25 GHz with a bandwidth Δf = 80 MHz. The maximum insertion loss in the passband is 4 dB. The filter has a 50 Ω input and output impedance, SubMiniature version A connector termination, and significantly reduced form factor. The wide stopband frequency range and narrow passband in conjunction with small dimensions make the filter suitable to use it as a part of a high sensitive readout for superconducting quantum circuits, such as superconducting quantum bits and cryogenic parametric amplifiers.

摘要

设计并制作了一种带有集成非均匀传输线的超宽带阻带发夹型带通滤波器，用于在低至毫开尔文的低温下以及10 Hz至10 GHz频率范围内进行高灵敏度测量。该滤波器的散射矩阵在T = 4.2 K时进行了表征。该滤波器在10 Hz至2.2 GHz以及2.3 GHz至10 GHz频段提供阻带，幅度抑制分别超过50 dB和40 dB。通带中心频率为f0 = 2.25 GHz，带宽Δf = 80 MHz。通带内的最大插入损耗为4 dB。该滤波器具有50 Ω的输入和输出阻抗、微型A版本连接器终端，并且外形尺寸显著减小。宽阻带频率范围和窄通带以及小尺寸使得该滤波器适合用作超导量子电路（如超导量子比特和低温参量放大器）高灵敏度读出的一部分。