MDA was the prime contractor for the Canadian Space Agency RADARSAT-1 program and supplied the complete SAR payload including the antenna and the ground segment. The RADARSAT-1 SAR antenna, which was launched into low-earth orbit in late 1995 and which has operated flawlessly since, is a slotted waveguide planar array operating at C-Band, with a 15m x 1.5m aperture formed by the deployment of four rectangular panels. It was the first such satellite to provide beam steering for enhanced coverage accessibility in both the strip-map and scan-SAR modes of operation, for image resolutions varying from 8m to 100m.

More information on RADARSAT-1 is available here