KEYSIGHT 8478B Coaxial Thermistor Mount (10 MHz ~ 18 GHz)

Frequency Range: 10 MHz to 18 GHz

Maximum SWR: 10 MHz to 30 MHz 1.75; 30 MHz to 100 MHz 1.35; 100 MHz to 1 GHz 1.10; 1 GHz to 12.4 GHz 1.35; 12.4 GHz to 18 GHz 1.60

Datasheet