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 a variety of semi-rigid coaxial cables for cryogenic applications, shown below in Table 1,
from which you can select in view of features such 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.

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👉 Cryogenic Products Line-up
👉 Bias-Tee for Cryogenic

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 66 2.20
[0.86 inch type]		 SUS304 1.62 Foamed
PTFE		 0.51 SBC 35 167 5.32 4.07 3.85 2.49 2.39
ULT-02 Low heat conductivity SBS 60 177 6.05 4.80 4.58 3.22 3.14
ULT-03 Minimal insertion loss Cu（70μm） +SUS304 SBC 84 350 4.20 2.90 2.80 2.05 2.00
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 4.10 2.80 2.70 1.95 1.90
ULT-06 Easy to bend  CuNi SCuNi 61 215 3.70 2.43 2.31 1.55 1.49
ULT-07 Easy to bend  CuNi CuNi 57 210 10.50 9.50 9.00 8.00 7.20
ULT-08 Low heat SUS304 SSUS 32 162 7.70 6.47 6.25 4.89 4.79
ULT-10 Thin 119 1.19
[047 inch type]		 BC 0.94 0.29 SBC 50 170 4.70 3.80 3.33 2.90 2.75
ULT-11 Thin CuNi SCuNi 55 187 6.70  5.60  5.45  4.25  4.17 
ULT-12 Thin CuNi CuNi 52 172 19.00 17.50 17.00 16.00 15.00
ULT-13 Low heat SUS304 SSUS 25 91 8.80 7.80 7.40 7.00 6.90
ULT-20 Very thin 170 0.86
[034 inch type]		 BC 0.66 0.20 BC 28 94 11.5 7.24 6.87 4.60 4.45
ULT-21 Very thin CuNi SCuNi 31 104 9.8 5.86 5.56 3.72 3.58
ULT-22 Very thin CuNi CuNi 30 100 21.91 17.90 15.50 14.50 13.50
ULT-23 Low heat SUS304 SSUS 20 85 24.00 19.90 17.50 16.50 15.50
ULT-30 Ultra thin 430 0.33
[013 inch type]		 SUS304 0.26 0.08 SUS304 1.6 4.6 66.90 52.00 47.40 40.10 39.00

*SBC: Silver plated beryllium copper (plate thickness 2.5 μm), BS:Brass, SBS: Silver plated brass (plate thickness 3.5 μm), BC: Beryllium copper,  CuNi: Cupronickel, SCuNi: Silver plated cupronickel,  SSUS: Silver plated SUS304
*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, GPPO(SSMP) 
ULT-02 1.87 6.05 9.56 12.71 19.6 8.0
ULT-03 1.50 4.20 5.20 7.50 9.0 12.0
ULT-04 1.21 2.87 5.00 7.30 9.1 10.0
ULT-05 1.50  4.10  5.10  7.80 11.70 12.0
ULT-06 1.17 3.70 5.23 7.77 11.88 8.0 
ULT-07 3.32 10.50 14.85 21.00 25.72 12.0
ULT-10 1.40 4.70 6.80 9.87 14.9 6.5
ULT-11 2.6  6.7  6.5  14.0  20.0  6.5
ULT-12 6.00 19.00 26.87 38.00 46.54 6.5
ULT-20 3.9 11.5 16.5 23.5 28.0 3.2
ULT-21 4.11 9.8 15.3 21.69 31.57 3.2
ULT-22 7.12 21.97 30.94 44.0 54.0 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(SMP) GPPO(SMPM)
Max. operating frequency (GHz) 6 18.5 40 or (46) 50 60 or (65) 40 60 or (65)

Order model example

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