Development of 1.3GHz high-Tc rf SQUID

• 来源期刊: 中国物理（英文版）
• 关键词: 1.3GHz HTc rf SQUID new structure sensor large effective
• 年，卷（期）: 2004,（1）
• 页码范围: 100-104
• 页数: 5页
• 语种: 英文

摘要

A new high-Tc (HTc) rf SQUID working at around 1.3GHz has been developed to avoid electromagnetic interference such as growing mobile communication jamming. This new system works in a frequency range from 1.23 to 1.42GHz (centred at 1.3GHz), which is not occupied by commercial communication. The sensor used in the 1.3GHz rf SQUID is made of a HTc coplanar superconducting resonator and a large-area HTc superconducting film concentrator. We have achieved in the 1.3GHz HTc rf SQUID system a minimal flux noise of 2.5×10-5φ0/√Hz and a magnetic field sensitivity of 38fT/√Hz in white noise range, respectively. The effective area of the concentrator fabricated on a 15×15mm2 substrate is 1.35mm2. It is shown that the 1.3GHz rf SQUID system has a high field sensitivity. Design and implementation of 1.3GHz HTc rf SQUID offers a promising direction of rf SQUID development for higher working frequency ranges.