Good question (not easy to find on the web). An overview of
Airborne SAR Sensors is given by my colleagues in Reigber et. al. "Very-High-Resolution Airborne Synthetic Aperture Radar Imaging: Signal Processing and Applications", Proceedings of IEEE and
Space-borne SAR Sensors can be found in table
http://database.eohandbook.com/database/instrumenttable.aspx where Type = "Imaging microwave radars".
DLR's latest airborne SAR sensor "DBFSAR" is not listed in this table published in 2013. It is described in Conference Paper DBFSAR: An airborne very high-resolution digital beamforming...
and a latest Chinese airborne SAR sensor is "N-SAR" recently published in Aifang Liu et. al. "N-SAR System: First Demonstration of Flight Test Results", EUSAR 2018.