The Thales ‘SPECTRA’ system built for the French Rafale fighter jet works in a similar manner. It uses active cancellation to make the plane ‘stealthy.’ It is the most guarded system on the Rafale.
Understood, but it has to be an active system that tracks the phase of the impinging wave and then with knowledge of processing and re-emission time, received signal strength and phase, produces an equally strong out-of-phase return signal in the direction of the impinging radar signal. It would necessarily be very complex.