Impedance matched absorptive thermal blocking filters

E J Wollack; D T Chuss; K Rostem; K U-Yen

doi:10.1063/1.4869038

Impedance matched absorptive thermal blocking filters

Rev Sci Instrum. 2014 Mar;85(3):034702. doi: 10.1063/1.4869038.

Authors

E J Wollack¹, D T Chuss¹, K Rostem¹, K U-Yen¹

Affiliation

¹ NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.

PMID: 24689607
DOI: 10.1063/1.4869038

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 Ω 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.