The Radiall R411815121 is an SMA attenuator offering 15dB of attenuation across a frequency range of DC to 18 GHz. It is rated for 2W of average power.
The Radiall R413820000 is an attenuator with a 20dB attenuation value and an 18GHz frequency range. It features a 50 Ohm impedance and comes in an SMA In-Line Module package.