Impedance Matched Absorptive Thermal Blocking Filters

Abstract

We have designed, fabricated and characterized absorptive thermal blocking filters for cryogenic microwave applications. The transmission line filter's input characteristic impedance is designed to match $50\Omega$ and its response has been validated from 0-to-50\,GHz. The observed return loss in the 0-to-20\,GHz design band is greater than $20$dB and shows graceful degradation with frequency. Design considerations and equations are provided that enable this approach to be scaled and modified for use in other applications.

References in corpus (3)

• Impedance-matched low-pass stripline filters
• Millikelvin thermal and electrical performance of lossy transmission line filters
• Micro-fabricated electromagnetic filters for millikelvin experiments

Cited by in corpus (5)

• The Experiment for Cryogenic Large-aperture Intensity Mapping (EXCLAIM)
• Analysis and calibration techniques for superconducting resonators
• Optical Design of the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM)
• Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling
• Fabrication of phononic filter structures for far-IR/sub-mm detector applications