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Passive Filters

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...

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Fabrication and Characterization of Superconducting Resonators

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Narrow bandpass cryogenic filter for microwave measurements.

B I Ivanov¹, D N Klimenko, A N Sultanov

¹Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany.

The Review of Scientific Instruments

|June 8, 2013

Summary

A new cryogenic bandpass filter enables highly sensitive measurements in superconducting quantum circuits. This ultra-wide stopband filter operates down to millikelvin temperatures, crucial for quantum computing applications.

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Area of Science:

Electrical Engineering
Cryogenic Engineering
Quantum Computing Hardware

Background:

Sensitive measurements in superconducting quantum circuits require specialized filters.
Existing filters may not meet the stringent requirements of millikelvin temperatures and wide frequency ranges.

Purpose of the Study:

To design and fabricate an ultra-wide stopband hairpin bandpass filter.
To enable highly sensitive measurements at cryogenic temperatures (down to millikelvin).
To assess the filter's suitability for superconducting quantum circuits.

Main Methods:

Design and fabrication of an ultra-wide stopband hairpin bandpass filter with integrated nonuniform transmission lines.
Characterization of the filter's scattering matrices at T = 4.2 K.
Evaluation of stopband suppression, passband center frequency, bandwidth, and insertion loss.

Main Results:

The filter exhibits a wide stopband from 10 Hz to 2.2 GHz (>50 dB suppression) and 2.3 GHz to 10 GHz (>40 dB suppression).
The passband is centered at 2.25 GHz with an 80 MHz bandwidth and a maximum insertion loss of 4 dB.
The filter features 50 Ω impedance, SMA connectors, and a reduced form factor.

Conclusions:

The developed filter is suitable for high-sensitivity readout in superconducting quantum circuits.
Its wide stopband, narrow passband, and compact size are advantageous for quantum computing applications.
The filter's performance at cryogenic temperatures makes it a valuable component for quantum technologies.