Development of a Quantum-Noise-Limited 230 GHz Band Receiver with Superconducting Tunnel Junctions for Radio Astronomy(超伝導トンネル接合を用いた量子限界に近い雑音温度を持つ電波天文用230GHz帯受信器の開発)

Low-noise receivers for radio astronomy have been built using Pb alloy superconducting tunnel junction mixers operating at 4.5 K. They have been used for 85-115-GHz astronomy with double-sideband receiver noise temperature between 70 and 200 K. Junction fabrication and receiver construction, operation, and performance are described herein.

IEEE Transactions on Microwave Theory and TechniquesFeb 1, 1985109 citations

A 100 - 115 GHz SIS receiver for radio astronomy

Hideo Ogawa

A 110 GHz superconductor insulator superconductor (SIS) tunnel junction receiver has been developed and used in regular astronomical observations on the 4m radio telescope at the Department of Astrophysics, Nagoya University. The SIS junction consists of a sandwich structure of Nb/AlOx/Nb, and is cooled to 4.2K with a closed cycle He-gas refrigerator. The receiver exhibits a best double side band noise temperature of 17±2 K at 110GHz. The receiver has a good response over this input frequency range of 98-115 GHz.

International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)Oct 1, 19914 citations