Hi all, Is there any way to impart a transformation upon a radio wave's reflection from an object, such that the reflected wave is different from the original signal in some way (frequency, phase, etc.)? Not sure what this would require (maybe a constant and active coordinated interference signal from the target object?), or whether it's possible at all. The idea here would be to devise an object that could be uniquely identified in a radar system by changing the reflected signal somehow (thus making the reflection distinguishable from other reflections coming from other objects). Anyone know of a way to achieve this? Thanks!