HP/Agilent-Keysight 83570A

The HP 83570A RF plug-in provides a 18 MHz to 26.5 GHz.
Power is internally leveled to a flatness < ± 1.4 dB.
The output power has a calibrated range of 11 dB (7 dB for HP 83572A).
The power level may be manually set to a 0.1 dB resolution, or the power level may be remotely HP-IB programmed to a 0.01 dB resolution.
In addition to a single output power, these plug-ins also have a power sweep function.

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Datasheet