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

Part No. Feature Max. operating frequency (GHz) External conductor Dielectric Internal conductor Heat quantity (μw/k )* Insertion loss (dB/m) at 10GHz 
Outer diameter(mm) Material Outer diameter(mm) Material Outer diameter(mm) Material 4K-20K 4K-100K 300K 110K 77K 20K 4K
ULT-01 Minimal heat conductivity 60 2.20 SUS304 1.62 Foamed
PTFE
0.51 SBC 35 167 5.32 4.07 3.85 2.49 2.39
ULT-02 Flexible and low heat conductivity SBS 60 177 4.65 3.67 3.26 2.85 2.75
ULT-03 Minimal insertion loss Cu(70μm) +SUS304 SBC 84 350 2.69 2.06 1.70 1.20 1.14
ULT-04 Non-magnetic BS SBS 146 493 2.87 2.29 1.96 1.47 1.47
ULT-05 Low heat conductivity and low insertion loss Cu(5μm) +SUS304 65 196 2.60 2.25 1.85 1.31 1.24
ULT-06 Flexible CuNi SCuNi 61 215 3.70 2.43 2.31 1.55 1.49
ULT-07 Flexible CuNi CuNi 57 210 4.10 2.80 2.70 1.95 1.90
ULT-10 Thin 18 1.19 BC 0.94 0.29 SBC 50 170 4.40 3.50 3.03 2.60 2.45

ULT-11

Thin 1.19 CuNi 0.94 0.29 SCuNi 55 187 4.00 3.12 2.75 2.37 2.23
ULT-12 Thin 1.19 CuNi 0.94 0.29 CuNi 52 172 4.42 3.55 3.10 2.65 2.50
ULT-20 Very thin 0.86 BC 0.66 0.20 BC 28 94 6.58 4.33 4.11 2.75 2.65
ULT-21 Very thin 0.86 CuNi 0.66 0.20 SCuNi 31 104 8.90 5.86 5.56 3.72 3.58
ULT-22 Very thin 0.86 CuNi 0.66 0.20 CuNi 30 100 9.20 6.10 5.75 3.95 3.70
ULT-30 Ultra thin 0.33 SUS304 0.26 0.08 SUS304 1.6 4.6 72.00 56.00 51.00 44.00 42.00

*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, CuNi: Cupronickel, SCuNi: Silver plated cupronickel
*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

Part No. Normal insertion loss(dB/m25 °C) Min. bending radius(mm) Applicable connector
1GHz 10GHz 20GHz 40GHz 60GHz
ULT-01 1.64 5.32 6.98 11.17 17.3 12.0 SMA, APC2.9, APC2.4, APC1.85
ULT-02 1.87 6.05 9.56 12.71 19.6 8.0
ULT-03 0.82 2.69 3.49 5.65 8.5 12.0
ULT-04 1.21 2.87 5.00 6.03 9.1 10.0
ULT-05 0.90 2.80 4.60 7.30 11.2 12.0
ULT-06 1.17 3.70 5.23 7.77 11.88 12.0
ULT-07 1.30 4.10 5.63 8.10 12.28 12.0
ULT-10 1.40 4.70 6.80 9.87 14.9 6.5
ULT-11 1.26 4.00 6.19 8.98 13.56 6.5
ULT-12 1.35 4.42 6.25 8.84 13.30 6.5
ULT-20 2.08 6.58 9.31 13.82 21.12 3.2
ULT-21 2.81 8.90 12.59 18.69 28.57 3.2
ULT-22 2.91 9.20 13.01 19.50 29.50 3.2
ULT-30 21.10 66.90 94.70 140.50 215.0 1.5

Connector type MMCX SMA 2.9mm(K) 2.4mm 1.8mm(V) GPO
Max. operating frequency (GHz) 6 18.5 40 or (46) 50 60 or (65) 40

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