Microwave Filter | Thermalizer

Designed for mili-Kelvin and sub-mili-Kelvin experiments

Microwave filtering and thermalization of signal wires are two critical ingredients in setting up a sensitive low-temperature experiment. Our compact cryogenic microwave filter and thermalizer (MFT) unites efficient electron thermalization with ultra-strong microwave attenuation.

MFTs consist of a copper or other low-resistivity wire embedded in a highly conductive silver matrix. The silver matrix acts as a heat exchanger ensuring optimal thermalization.

The superior performance of single MFT filters was proven in an experiment that cooled a Coulomb blockade thermometer down to 7.5 mK with a dilution fridge temperature at 5 mK (ref: Scheller et al. APL 2014).

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Strong attenuation and thermalization
Low capacitance and low resistance

Strong attenuation of >100 dB above 130 MHz

~150 Ω & 2.5 nF @ 4K

or 

~50 mΩ & 5 nF @ 4K

Low capacitance significantly reduces noise when using IV converters for measurements

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Single MFT filters

MCX connectors or customized
Length 30 mm 
Diameter 6 mm

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Compact filter box

25 filters inside

Micro-D connectors

Non-magnetic copper box, gold-plated for best thermal contact

Easy to mount at 10 mK 

33.5 x 50 x 68 mm, 350 gr