Multilayer cryogenic powder filters with low parasitic capacitance

Area of Science:

• Physics
• Electrical Engineering
• Materials Science

Background:

• Conventional powder filters use the skin effect for radio frequency (RF) signal attenuation.
• These filters often exhibit high parasitic capacitance, limiting bandwidth in sensitive measurements.
• Parasitic capacitance can cause unwanted sample heating in cryogenic setups.

Purpose of the Study:

• To develop a cryogenic powder filter with high RF attenuation and low parasitic capacitance.
• To mitigate RF signal intrusion and associated sample heating.
• To preserve the performance of sensitive measurement systems.

Main Methods:

• Designed and fabricated a multilayer powder filter.
• Utilized a novel housing structure to minimize parasitic capacitance.
• Tested RF attenuation in the gigahertz range.

Main Results:

• Achieved high RF signal attenuation in the gigahertz range.
• Significantly reduced parasitic capacitance to ground compared to conventional designs.
• Demonstrated suppression of sample heating without performance degradation.

Conclusions:

• The multilayer powder filter effectively addresses limitations of conventional designs.
• This technology enables sensitive measurements in RF-rich cryogenic environments.
• Offers a solution for preventing RF-induced heating in scientific instrumentation.