Cryogenic Coaxial Cables

e l s p e c d i s t r i b u t e

Cryogenic Cables at elspec group

Coaxial cables with an outer conductor of stainless steel are commonly used in systems experien-cing temperatures ranging above or below -55°C to +150°C. Cryogenic systems are sensitive to heat transfer into the Dewar chamber and rely on the relatively low heat transfer characteristics of certain stainless steel alloys.

The higher attenuation of these cables can be offset by using a special bimetallic construction pionee-red by Precision Tube Company which effectively has the same loss as copper.This utilizes a thin skin of copper immediately adjacent to the dielectric which acts as the primary con-ductor at microwave frequencies. This will have a slightly higher heat conduction than stainless steel alone but must be considered if preservation of signal strength is a concern.

A Semi Rigid cable is unique because it is easily bent into it‘s finished shape, and still maintains this shape after beding. This property makes it ideal for automated bending equipment.

Storm Flex047, Storm Flex047 CRYO and Storm Flex 034 have a level of performance that is comparable to MIL-C-17 semi rigid cable, yet the handling resembles RG flexible cables.

Stainless Steel Semi Rigid Cables with Bimetallic Construction

Semi Rigid Cable with Saintless Steel Construction

Flexible High Performance Coaxial Cables

The benefits:

• it retains the shape after shaping

• low VSWR

• high durability

The benefits:

• low leakage

• low VSWR

• true flexibility

• high durability

• lower weight

Cables at Cryo Application

Flexible High Performance Coaxial Cables

MMK5001 MK5001 SF047 SF047CRYO SF034

Diameter 0.53 mm 1.05 mm 1.36 mm 1.36 mm 0.93 mm

Plastic PFA PTFE, FEP PTFE, FEP PTFE, FEP PFA, FEP

Metal Cu Cu SS304, Cu SS304 SS304

Max F 3 GHz 3 GHz 50 GHz 50 GHz 50 GHz

Att @3 GHz 9.8 dB/m 4.4 dB/m 2.4 dB/m 3.4 dB/m 3.6 dB/m

Semi Rigid Coaxial Cables Cryogenic

AN50085 AN50141 JN50085 SN50085 RN50085 RN50141

Inner Conductor StCuAg StCuAg BeCuAg 304SS CuAg CuAg

Dielectric PTFE PTFE PTFE PTFE APTFE APTFE

Outer Conductor Cu/SS304 Cu/SS304 304SS 304SS CU/304SS CU/304SS

Outer Diameter 2.2 mm 3.6 mm 2.2 mm 2.2 mm 2.2 mm 3.6 mm

Loss @1 GHz/m 0.64 dB/m 0.4 dB/m 1.5 dB/m 4.2 dB/m 0.56 dB/m 0.35 dB/m

Copper has an unusual thermal conductivity at the temperatur range up to 50 Kelvin. The following diagrams shows the final conductivity different cables. The cables at the first one have copper for the inner contact and/or for the shilding. The cables at the second diagram are build with silver plated stainless steel for the centre contact and the shilding.

Legend:red: Copperwhite: Dielectricgray: Stainless Steelblue: Plastic

Abbrivations:StCuAg: Stainless Steel, Copper and Silver platedBeCuAg: Copper Beryllium, Silver plated304SS: Stainless Steal 304CuAg: Copper, Silver platedCu/S304: Stainless Steal, Copper plated

Thermal Conductivity of One Meter Long Cables

Frequency Range Connector Series

DC to 65 GHz G3PO

DC to 40 GHz 2.92 mm / GPPO / SMP / MSMP

DC to 18 GHz SMA

Accessories - Connectors

Storm Flex 047, Storm Flex 047CRYO and Storm Flex 034 have performance comparable to MIL-D-17 Semi Rigid cable, yet is to handle like a RG flexible cable.

Ready Made Cable Assemblies

The benefits:

• low leakage

• low VSWR

• true flexiblity

• high durability

• lower weight

Connectors PLUS Ready Made Cable Assemblies

Individual solutions for your requirements.

Exceptional specialty items, selected, measured pre-cisely, collected individually and assembled with the highest precision and great dedication.Whether it is an individual item or a high-volume project, these products are custom-tailored for a customer or an application and will be handmade in time-consuming and costly work processes. Wor-king with you at the elspec manufactory, we develop approaches that open up completely new solutions.

Connect coaxial cable adapter correctly with torque wrench.

MORE KNOWLEDGE WITH elspec group

Coaxial measurement cables must usually provide precise

measurement results on the Network Analyzer. A torque

wrench is essential to ensure that the lifespan of the ca-

ble is as long as possible, and that the measurements are

accurate. It prevents over-twisting and thus prevents da-

mage to the cable.

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coaxial cables.

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el-spec GmbHLauterbachstraße 23c82538 GeretsriedTel.: +49 8171 4357-0Fax: +49 8171 4357-99E-Mail: safe@elspecgroup.dewww.elspecgroup.de

07/2018 | Error and omission excepted. Subject to change without notice.