18 GHz 047 CuNi Cryogenic RF Coaxial Cable G12E-CN

Engineering Note

The G12E-CN is a 1.20 mm OD copper nickel cryogenic RF coaxial cable designed for lower-attenuation cryogenic routing where RF loss and thermal load must be evaluated together. Its construction uses a silver-plated CuNi inner conductor, PTFE dielectric, and CuNi tube outer conductor, supporting balanced low-temperature RF paths in quantum systems, dilution refrigerator interconnects, and 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	G12E-CN
Product Type	Copper Nickel Cryogenic RF Coaxial Cable
Material Family	CuNi
Outer Diameter	1.20 mm
Operating Frequency	18 GHz
Cable-Level Cutoff Frequency	117 GHz
Characteristic Impedance	50 ± 2.5 Ω
Shielding Effectiveness	>165 dB
Dielectric Withstand Voltage	100 V DC
Velocity of Propagation	70%
Min. Bending Radius, Static	4.20 mm
Weight	0.0062 kg/m
Temperature Range	-268°C to 150°C
4K Thermal Conductivity	104 ×10⁻⁶ W·cm/K
Inner Conductor	Silver-plated CuNi wire, 0.300 mm [0.012 in]
Dielectric	PTFE, 0.950 mm [0.037 in]
Outer Conductor	CuNi tube, 1.200 mm [0.047 in]
Attenuation @ 300K	1.8 dB/m @500 MHz; 2.5 dB/m @1 GHz; 5.7 dB/m @5 GHz; 8.0 dB/m @10 GHz; 10.8 dB/m @18 GHz
Attenuation @ 4K	0.7 dB/m @500 MHz; 1.0 dB/m @1 GHz; 2.3 dB/m @5 GHz; 3.2 dB/m @10 GHz; 4.4 dB/m @18 GHz