CryoCoax, an Intelliconnect brand, has developed high density multiway;connectors;based around the SMPM interface. This interface allows many more coaxial lines in a given space along with simplifying the installation and customization within a dilution refrigerator. The typical spacing using SMA connectors is limited to approximately 16 mm, but these high density connectors are designed with a pitch of 4.75 mm. CryoCoax can supply top-to-bottom assemblies, known as “coax sticks,” which can be fully customized with attenuator blocks and a full complement of cable types and materials. These assemblies can provide connections from room temperature, through all the cooling stages down to the low temperature level. These interconnects undergo RF testing at room temperature and test data can be provided for DC resistance, return loss and insertion loss up to 40 GHz, even though most applications operate at much lower frequencies. The connector components are machined from high purity copper and beryllium copper and are gold-plated to provide the best thermal conductivity. If required, non-magnetic versions can also be specified. The connectors are compatible with .047 in. (1.19 mm) size coax and they are available in semi-rigid, flexible or conformable versions. Semi-rigid cables are available in niobium-titanium, stainless steel, copper, cupronickel and beryllium copper as well as combinations of these with silver-plated conductors. These options provide the user with a large choice in terms of thermal conductivity and attenuation. CryoCoax also develops solderless connections for high density connectors as well as the traditional SMA, 2.92 and SMP connectors.

CryoCoax, an Intelliconnect Brand
Crossville, Tenn.
Chelmsford, England
www.cryocoax.com