I have a hover tanks zipping around in my setting. None of these vehicles utilize physical optical view ports. All information is gathered from sensors. As such there are a multitude of cameras, radars, lidars etc.
My hover tanks need to use chaff to defend themselves against enemy radar and radar guided weaponry. In modern day aerial combat, chaff is used to defend against radar guided missiles. However modern radars use doppler shift to distinguish between the speed of a chaff cloud, and the speed of a jet. Thus, reorientating the seeker onto their target. Consequently, chaff seems to work better on naval vessels as part of a layered defense.
Though my hover tanks are fast, they aren't jet like fast. However, they do have a few advantages. They have the ability to suspend certain types of (sci fi) particles in the air around them up to a certain speed. They already use these exotic particles as a glorified particle shield. By the same extension, I have a cloud of particles that can be disseminated into the air around the tank that are capable of interfering with enemy radar waves. These particles can also be suspended/held up around the hover tank up to certain speeds, reducing the effectiveness of things like doppler shift.
This particle like cloud acts like chaff in that it scatters radar waves and causes erroneous returns or simply reflects radar waves off completely. While not perfect enough to stop a radar from seeing an enemy tank or a human from interpreting that there may be something out there, the resolution is low enough that it can cause warhead seekers and targeting computers to have a tougher time.
Why does my suspended exotic particle cloud reflect/scatter or jam radar waves?
As I understand, chaff works because they're cut in a fashion that works against radar waves and their lower frequency/ longer wavelengths. The actual metalic nature and its shape helps damage a radar's return capability. Chaff is essentially in the physical/larger domain of jamming techniques.
This particle cloud system will be working on a far smaller scale than chaff in terms of size. Essentially operating on the electromagnetic spectrum. At present I am unsure if things in the particle or electromagnetic scale are capable of reflecting or redirecting wavelengths in a way chaff does. Ideally an answer, answers the question in that scale/realm.
Lastly, any answer doesn't have to be rooted in hard science. Plausible/sci-fi will be just as effective considering the answer will focus on what the particle cloud is doing. Suspending the particles is already a stretch from reality.