title: 50 omega characteristic impedance low-pass metal powder filters.
abstract: We have fabricated several 50 omega characteristic impedance low-pass metal powder filters. The filters are made with bronze or copper metal powder with varying amounts of metal powder in a metal powder/epoxy mixture. Our goal is to make a filter with a characteristic impedance Z = 50 omega at frequencies up to 10 GHz. Using a 78% bronze powder/epoxy mixture in a suitable geometry, we achieved an impedance Z = 54 omega at 4.2 K, with a cutoff frequency fc approximately/= 0.3 GHz and an attenuation A = Vout/Vin=0.0001 (-80 dB) at 10 GHz. We also made several non-50 omega low-pass bronze powder filters with fc = 1 MHz and A = 0.0001 at 10 MHz. Fabrication details and performance data will be presented for both types of filter.
authors.affiliation: IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA. fpmill@us.ibm.com
authors.forename: F P
authors.initials: FP
authors.lastname: Milliken
authors.forename: J R
authors.initials: JR
authors.lastname: Rozen
authors.forename: G A
authors.initials: GA
authors.lastname: Keefe
authors.forename: R H
authors.initials: RH
authors.lastname: Koch