title: Printed circuit board metal powder filters for low electron temperatures.
abstract: We report the characterisation of printed circuit boards (PCB) metal powder filters and their influence on the effective electron temperature which is as low as 22 mK for a quantum dot in a silicon MOSFET structure in a dilution refrigerator. We investigate the attenuation behaviour (10 MHz-20 GHz) of filter made of four metal powders with a grain size below 50 μm. The room-temperature attenuation of a stainless steel powder filter is more than 80 dB at frequencies above 1.5 GHz. In all metal powder filters, the attenuation increases with temperature. Compared to classical powder filters, the design presented here is much less laborious to fabricate and specifically the copper powder PCB-filters deliver an equal or even better performance than their classical counterparts.
authors: NanoElectronics Group, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands. f.muller@utwente.nl
authors: Filipp
authors: F
authors: Mueller
authors: Raymond N
authors: RN
authors: Schouten
authors: Matthias
authors: M
authors: Brauns
authors: Tian
authors: T
authors: Gang
authors: Wee Han
authors: WH
authors: Lim
authors: Nai Shyan
authors: NS
authors: Lai
authors: Andrew S
authors: AS
authors: Dzurak
authors: Wilfred G
authors: WG
authors: van der Wiel
authors: Floris A
authors: FA
authors: Zwanenburg