KEYCOM provides solutions in the 300 GHz to 1 μHz frequency range (SHF/EHF/MW/UHF/VHF/ULF).
We undertake designing, manufacturing and measuring. Please feel free to contact us.

Semi-Rigid Cables for Cryogenic (Super Low Temperature) Applications

Model No. upj020020001108-07

KEYCOM offers wide variety of superconducting semi-rigid coaxial cables for
cryogenic applications, shown below in Table 1, from which you can select based on such features as heat conductivity, flexibility, insertion loss, permeability, or thickness to meet your specific requirements.
They are low in heat conductivity, minimizing inflow of the heat from the high-temperature end. 
Operating frequency is DC-40GHz by default, but available up to 65GHz upon request.
The characteristic impedance is 50Ω.

Specifications and Model No. - Table 1

Characteristics Model Number Outer diameter φ Heat quantity μw/k note*1 Insertion Loss dB/m at 10GHz
4K-20K 4K-100K 300K 110K 77K 20K 4K
Minimum heat conduction ULT-01 2.2mmφ (0.085") 35 167 5.32 4.07 3.85 2.49 2.39
Flexible and low heat conduction ULT-02 2.2mmφ (0.085") 60 177 4.65 3.67 3.26 2.85 2.75
Minimum insertion loss ULT-03 2.2mmφ (0.085") 84 350 2.69 2.06 1.7 1.2 1.14
Non-magnetic ULT-04 2.2mmφ (0.085") 146 493 2.87 2.29 1.96 1.47 1.47
Low heat conduction and low insertion loss ULT-05 2.2mmφ (0.085") 65 196 2.60 2.25 1.85 1.31 1.24
thin ULT-10 1.19mmφ 50 170 4.40 3.50 3.03 2.60 2.45
very thin ULT-20 0.86mmφ 28 94 6.58 4.33 4.11 2.75 2.65
ultra thin ULT-30 0.33mmφ 1.6 4.6 72 56 51 44 42

(General example: Cupronickel) Note that Insertion loss is larger.
Characteristics Model Number Outer diameter φ Heat quantity μw/k note*1 Insertion Loss dB/m at 10GHz
4K-20K 4K-100K 300K 110K 77K 20K 4K
Larger insertion loss 0.085" 52 229 10.10 9.56 9.43 9.37 8.5

note*1 : Heat quantity required for one end of 10 cm long cable (excluding connectors) to reach 20 K or 100 K when 4 K heat anchor is applied to the other end of the cable.


Specifications and Model No. - Table 2

Model Number Minimum bending radius mm (to the center of cables) Standard Insertion Loss dB/m(25°C) Material Available connector
1GHz 10GHz 20GHz 40GHz Inner conductor Outer conductor
ULT-01 12 1.64 5.32 6.98 11.17 SBC SUS304 SMA, APC2.9, APC2.4, APC1.85
ULT-02 8 1.87 6.05 9.56 12.71 SBS SUS304
ULT-03 12 0.82 2.69 3.49 5.65 SBC Cu70 μm+SUS304
ULT-04 10 1.205 2.87 5.0 6.03 SBS BS
ULT-05 12 0.90 2.80 4.60 7.30 SBS Cu5 μm+SUS304
ULT-10 6.5 1.40 4.70 6.80 9.87 SBC SBC SMA, MMCX, GPO
ULT-20 3.2 2.0 6.58 9.44 14.5 BC BC
ULT-30 1.5 21.1 66.9 94.7 140.5 SUS304 SUS304

(Example: Cupronickel)
Model Number Minimum bending radius mm (to the center of cables) Standard Insertion Loss dB/m(25 °C) Material
1GHz 10GHz 20GHz 40GHz Inner conductor Outer conductor
- 12 3.1 10.1 14.2 21.2 Cupronickel Cupronickel

SBC: Silver plated beryllium copper (plate thickness 2.5 μm)
SPC: Silver plated annealed copper wire
SBS: Silver plated brass (plate thickness 3.5 μm)
BC: Beryllium copper

Order model example

ULT - 03 - SMA(m)SMA(f) - 0500
Cable type Connector name Connector phase front length (mm)

 

Keyword
ultracold temperature, very low temperature, at extremely low temperatures, cryogenic, supercold, supercool, ultracold, ultracold gas, cryocable, ultracold atom, cryopump, cryobank, very low temperature physics