A New Flexible Radio Frequency Microstrip Used in Cryostat

A flexible radio frequency (RF) microstrip attached to a nanopositioner in a cryostat is presented. It makes it possible to supply RF signals to a device mounted on the nanopositioner without hindering the motion of the positioner. The insertion loss of the microstrip is 1 dB at 3 GHz. The nanopositioner can move freely at 900mK with the microstrip attached to it This kind of flexible RF microstrip is useful for measuring nanomechanical resonators in the cryostat.