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Niobium Tunable Microwave Filter

Raihan Rafique (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Thomas Ohki ; Peter Linnér (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Anna Herr (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
IEEE transaction on Microwave Theory and Techniques (0018-9480 ). Vol. 57 (2009), 5, p. 1173-1179.
[Artikel, refereegranskad vetenskaplig]

A superconductor bandpass filter with tunable central frequency in the range of 2.1–3.5 GHz has been implemented using Superconducting Quantum Interference Devices (SQUID). The filter is designed as two pi–network resonators connected by a transmission line. Both resonators have a SQUID inductor with a tuning range of 65–200 pH, controlled by DC current magnetically coupled to the SQUIDs. Over a frequency tunability of 40% from 3.5 to 2.1 GHz, the filter has a corresponding fractional bandwidth of 35% to 27% and a mid-band insertion loss of 0.5–3.0 dB. Due to the presence of active elements, the tunability of the filter depends on the power of the microwave signal. A maximum power of -52dBm corresponds to a frequency tuning range of 15%. Spectral measurements by controlling the central frequency of the filter with variable pulse-width shows that the filter can be tuned at a rate of 120 GHz per us.

Nyckelord: Niobium (Nb), Low Temperature Superconductor (LTS), tunable filter, Superconducting Quantum Interference Device (SQUID), high speed tuning, tunable inductance, qubit operation.

Denna post skapades 2008-01-16. Senast ändrad 2010-02-26.
CPL Pubid: 66901


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