18 GHz 034 NbTi Superconducting Cryogenic RF Coaxial Cable G08E-NT

Engineering Note

The G08E-NT is a 0.86 mm OD NbTi superconducting cryogenic RF coaxial cable designed for ultra-low-temperature RF routing where superconducting behavior and thermal conduction must be evaluated together. Its construction uses a niobium titanium wire inner conductor, PTFE dielectric, and niobium titanium alloy outer conductor, supporting superconducting cryogenic RF interconnects, quantum processor control and readout lines, and dilution refrigerator RF routing with minimized thermal load. The 18 GHz operating frequency is intended for preliminary cable selection; final assembly performance may depend on connector interface, cable length, routing form, thermal anchoring, and operating temperature stages.

Cable Model	G08E-NT
Product Type	NbTi Superconducting Cryogenic RF Coaxial Cable
Material Family	NbTi
Outer Diameter	0.86 mm
Operating Frequency	18 GHz
Cable-Level Cutoff Frequency	154 GHz
Characteristic Impedance	50 ± 3 Ω
Shielding Effectiveness	>165 dB
Dielectric Withstand Voltage	100 V DC
Velocity of Propagation	77%
Min. Bending Radius, Static	3.20 mm
Weight	0.0024 kg/m
Temperature Range	-269°C to 200°C
4K Thermal Conductivity	4.63 ×10⁻⁶ W·cm/K
Inner Conductor	Niobium titanium wire, 0.220 mm [0.009 in]
Dielectric	PTFE, 0.650 mm [0.026 in]
Outer Conductor	Niobium titanium alloy, 0.860 mm [0.034 in]
Attenuation @ 300K	6.7 dB/m @500 MHz; 9.6 dB/m @1 GHz; 23.0 dB/m @5 GHz; 34.0 dB/m @10 GHz; 48.0 dB/m @18 GHz
Attenuation @ 4K	<0.5 dB/m @500 MHz; <0.5 dB/m @1 GHz; <0.5 dB/m @5 GHz; <0.5 dB/m @10 GHz; <0.5 dB/m @18 GHz