18 GHz 034 CuNi Cryogenic RF Coaxial Cable G08E-CN

Engineering Note

The G08E-CN is a 0.86 mm OD copper nickel cryogenic RF coaxial cable designed for compact low-temperature RF routing where thermal load and RF attenuation must be evaluated together. Its construction uses a silver-plated CuNi inner conductor, PTFE dielectric, and CuNi tube outer conductor, supporting cryogenic signal paths in quantum systems, dilution refrigerator interconnects, and low-temperature microwave measurement setups. 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-CN
Product Type	Copper Nickel Cryogenic RF Coaxial Cable
Material Family	CuNi
Outer Diameter	0.86 mm
Operating Frequency	18 GHz
Cable-Level Cutoff Frequency	168 GHz
Characteristic Impedance	50 ± 3 Ω
Shielding Effectiveness	>165 dB
Dielectric Withstand Voltage	100 V DC
Velocity of Propagation	77%
Min. Bending Radius, Static	4.30 mm
Weight	0.0034 kg/m
Temperature Range	-268°C to 150°C
4K Thermal Conductivity	70.7 ×10⁻⁶ W·cm/K
Inner Conductor	Silver-plated CuNi wire, 0.210 mm [0.008 in]
Dielectric	PTFE, 0.610 mm [0.024 in]
Outer Conductor	CuNi tube, 0.860 mm [0.034 in]
Attenuation @ 300K	2.2 dB/m @500 MHz; 3.2 dB/m @1 GHz; 7.2 dB/m @5 GHz; 10.2 dB/m @10 GHz; 13.9 dB/m @18 GHz
Attenuation @ 4K	1.0 dB/m @500 MHz; 1.4 dB/m @1 GHz; 3.2 dB/m @5 GHz; 4.6 dB/m @10 GHz; 6.2 dB/m @18 GHz