18 GHz 086 NbTi Superconducting Cryogenic RF Coaxial Cable G22-NT

Engineering Note

The G22-NT is a 2.13 mm OD NbTi superconducting cryogenic RF coaxial cable designed for larger 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 larger RF paths where minimized thermal load is required. 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	G22-NT
Product Type	NbTi Superconducting Cryogenic RF Coaxial Cable
Material Family	NbTi
Outer Diameter	2.13 mm
Operating Frequency	18 GHz
Cable-Level Cutoff Frequency	69 GHz
Characteristic Impedance	50 ± 2 Ω
Shielding Effectiveness	>165 dB
Dielectric Withstand Voltage	500 V DC
Velocity of Propagation	77%
Min. Bending Radius, Static	11 mm
Weight	0.0015 kg/m
Temperature Range	-269°C to 200°C
4K Thermal Conductivity	26.4 ×10⁻⁶ W·cm/K
Inner Conductor	Niobium titanium wire, 0.530 mm [0.021 in]
Dielectric	PTFE, 1.600 mm [0.063 in]
Outer Conductor	Niobium titanium alloy, 2.130 mm [0.084 in]
Attenuation @ 300K	3.17 dB/m @500 MHz; 4.56 dB/m @1 GHz; 10.97 dB/m @5 GHz; 16.34 dB/m @10 GHz; 23.21 dB/m @18 GHz
Attenuation @ 4K	<0.3 dB/m @500 MHz; <0.3 dB/m @1 GHz; <0.3 dB/m @5 GHz; <0.3 dB/m @10 GHz; <0.3 dB/m @18 GHz