제주장학재단

Advanced Filting and Thermalization Below 1 Kelvin

At millikelvin temperatures, ensuring cold electrons in signal lines is a challenge. QFilter-II addresses this by cooling electrons and filtering out electrical noise ranging from about 65 kHz to tens of GHz. Constructed from gold-coated high-conductivity copper and mountable on your cryostat’s mixing chamber plate, it is a key component for any cryogenic setup.

24 Line Filter Configureration with Optimal Performance

Our standard configuration offers two filtering banks (low-frequency and radio frequency) with 25-pin micro-D connectors. These banks are connected in series using a shielded jumper cable. The compact, non-magnetic design allows for direct mounting on the mixing chamber plate, compatible with most fridge manufacturers such as Bluefors fridges and the Oxford Instrument Proteox shown below.

Well-Engineered Filtering Banks for Low Temperatures and High Signal Interity

QFilter-II features two low-pass filtering banks in series: a low-frequency (65 kHz) filter with RC circuits and a high-frequency (RF, 225 MHz) filter with LC circuits. Each bank is crafted with several individually shielded filter stages. Signal lines support 150V voltages (below 4 Kelvin, max. 6mA for RC, 10mA for RF) and provide >10GΩ isolation below 4K to ground and other lines. Individual low-frequency filter lines can be shortened upon request, allowing for higher signal currents e.g. used for current biasing flux-lines.

Scalability for High Channel Demands

For systems requiring more than 24 lines, QFilters can be efficiently stacked (top image) saving space on the mixing chamber plate or connected in series (bottom image) removing the need for jumper cables. This flexibility allows for configurations like dual RC or dual RF filters, catering to diverse setup requirements.

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