Radar waves can pass through many substances (they appear transparent like glass) but are reflected efficiently by metals (which act more like a mirror to radar).
Thus if you want to confuse a radar system you can scatter a mass of thin, light aluminium confetti in the air and this will appear as a fog, hiding the target (your plane) from the enemy. Aluminium is used because it is a light metal that can be made into thin sheets or ribbons (aluminium foil).
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A radar engineer works with radar. They have design, develop, install, and test a radar.
Radar range is the distance of the object from the radar. Radar bearing is the direction of the object in relation to the radar. As radar is primarily used for ranging, the range information may be more important than the bearing.
We're assuming that the question refers to a speed radar gun, and not to a Doppler weather radar, FAA air-route surveillance radar, or military radar. Get a microwave source that runs on 13 volts and radiates at 10.525 GHz. Connect it to your car's electrical system and mount it behind the front grill. Speed radars will not be able to get a reading from the front, and they'll be effectively jammed. The operator will stop you to see what you've got going. Hopefully, he'll ticket you for interfering with local traffic regulation, and then send your ID to the FCC, who will fine you for operating an unlicensed RF transmitting source. And that's how you do it.
An FMCW radar may make use of Doppler, but it doesn't necessarily.
Microwave IS used in RADAR.