FROM OUR PRODUCT RANGE
QFilter-II Compact
- Signal Lines Up to 24
- Filter Stages 2 banks
- Low-Freq Cutoff 65 kHz
- RF Cutoff 225 MHz
- Isolation >10 GΩ
- Material Gold-coated copper
QFilter-II Compact is a multi-stage cryogenic microwave filter, a low-pass design that rejects electrical noise and holds millikelvin electron temperatures across up to 24 signal lines.
It runs two filtering banks in series, a low-frequency RC bank cutting off around 65 kHz and a radio-frequency LC bank around 225 MHz, each built from individually shielded stages. Together they attenuate microwave and RF noise on DC and low-frequency lines. Signal lines carry up to 150 V with isolation above 10 GΩ to ground below 4 K, and the compact, non-magnetic housing mounts directly on a cryostat’s mixing chamber plate. Multiple units stack in series to scale to 48 lines and beyond when a setup needs more channels.
Overview
QFilter-II Compact is Quantum Machines’ cryogenic microwave filter, a multi-stage low-pass design built to reject electrical noise and hold millikelvin electron temperatures across up to 24 signal lines. It mounts directly on a cryostat’s mixing chamber plate, shielding sensitive quantum electronics from noise that ordinary wiring carries in.
Specifications
- 24 signal lines per standard unit, two filtering banks in series
- Low-frequency (RC) bank: cut-off around 65 kHz
- Radio-frequency (LC) bank: cut-off around 225 MHz
- Isolation: greater than 10 GΩ to ground and other lines, below 4 K
- Signal line rating: 150 V, 6 mA (RC) or 10 mA (RF)
- Construction: gold-coated high-conductivity copper, non-magnetic
Additional Information
- Stacks with additional units to scale to 48 signal lines and beyond
- Connectors: 25-pin micro-D, banks linked by a shielded jumper cable
- Compatible with most fridge manufacturers, including Bluefors and Oxford Instruments
- Developed from research at Harvard University and the University of Copenhagen
- Made by Quantum Machines, available in India exclusively through Globetek
