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Superconducting IF biasing circuit for low-noise cryogenic applications

Dimitar Dochev (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Raquel Monje (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Vessen Vassilev (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Victor Belitsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling)
Journal of Physics Conference Series. 9th European Conference on Applied Superconductivity (EUCAS). Dresden, GERMANY. SEP 13-17, 2009 (1742-6588). Vol. 234 (2010), 4,
[Konferensbidrag, refereegranskat]

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.

Article Number: 042007

Denna post skapades 2010-07-23. Senast ändrad 2014-09-02.
CPL Pubid: 123938


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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling (2005-2010)


Den kondenserade materiens fysik
Elektroteknik och elektronik

Chalmers infrastruktur