Superconducting IF biasing circuit for low-noise cryogenic applications
Paper i proceeding, 2010

A planar superconducting circuit designed for use in low-noise cryogenic applications is presented. The circuit is a bias-T combined with a 4–8 GHz impedance matching circuitry, which employs entirely planar design with a novel layout. The proposed and tested circuitry is intended to be used with a SIS mixer and incorporates a double section transformer based on microstrip line technology with a total impedance transformation of 5:1 within the frequency band. One of the transformer sections employs a three-line coupled line, which also serves as a DC block capacitor. The microstrip lines were manufactured using superconducting Nb metallization, which provides a conduction loss-free solution at the operation temperature of 4 K. S-parameter measurements at 4 K temperature were performed and found to be in a good agreement with the simulations. The device measured return loss is better than −10 dB within the frequency band. Furthermore, the circuit was tested as a part of 385 – 500 GHz double sideband heterodyne SIS receiver demonstrating a flat noise temperature response of 80 – 90 K over the entire IF band of 4 – 8 GHz.

Författare

Dimitar Milkov Dochev

Chalmers, Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling

Raquel Monje

Chalmers, Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling

Vessen Vassilev

Chalmers, Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling

Victor Belitsky

Chalmers, Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling

Journal of Physics: Conference Series

1742-6588 (ISSN)

Vol. 234 4

Ämneskategorier

Elektroteknik och elektronik

Den kondenserade materiens fysik

DOI

10.1088/1742-6596/234/4/042007

Mer information

Senast uppdaterat

2018-11-05