US 2026/0291466 A1 · TUNABLE SUPERCONDUCTING FILTERS

Abstract

A tunable filter can be used to shift a passband of allowable frequencies travelling along a microwave transmission line to a superconducting device in a cryogenic environment, and is formed of materials that superconduct at and below a critical temperature. The tunable filter includes several tunable resonators capacitively coupled to the transmission line, each including a fixed capacitor and a tunable inductance. Each tunable resonator has a resonant frequency, and the union of their resultant frequency profiles determines an overall passband of the tunable filter. Simultaneous tuning of all the inductive elements through the application of one or more bias signals can shift the overall passband of the tunable filter. The tunable filter provides a time-domain based switching solution that limits energy dissipation. The tunable filter can be used to reduce unwanted noise from reaching the superconducting device or to access a particular device within the superconducting device.

Claims22

Dependent claims

A tunable filter to electrically couple to a transmission line, the tunable filter comprising:

a plurality of tunable resonators, each one of the plurality of tunable resonators comprising one or more materials that exhibit superconducting behavior at and below respective critical temperatures,
each tunable resonator of the plurality of tunable resonators comprising a respective tunable inductance and a respective fixed capacitance to provide a respective resonator frequency response having a respective range of passable frequencies, and
wherein the tunable filter has an overall resonator frequency response determined by a cumulative union of the ranges of passable frequencies of the resonator frequency responses of the plurality of tunable resonators, wherein the overall resonator frequency response is controllable by selective tuning of the tunable inductances.

A method to shift a frequency range of signals that are transmittable across a transmission line comprising:

transmitting the signals across a tunable filter electrically coupled to the transmission line, wherein the tunable filter includes a plurality of tunable resonators each having a respective tunable inductance and a respective fixed capacitance to provide respective resonator frequency responses, the tunable filter having an overall resonator frequency response determined by a union of a ranges of passable frequencies of the resonator frequency responses, and the plurality of tunable resonators and the transmission line being comprised of one or more materials that exhibit superconducting behavior at and below respective critical temperatures;
modifying a bias signal based on a tuned passable frequency range;
and
applying the modified bias signal to each tunable inductance to shift the range of passable frequencies of each tunable resonator, such that the overall resonator frequency response of the tunable filter shifts to enable transmission thereacross of components of the signals within the tuned passable frequency range.

1 more element

Dependencies are inferred from the claim text.

Tunable superconducting filters

Life of this patent

Tunable superconducting filters

Life of this patent

Abstract

Claims22