RCS:

Basics of a dielectric broadband absorber
Performance for LA-0 absorber.
Raw panels of LA-0.
3/4" in LA-0 in front bumper.
3/4" in LA-0 in rear bumper.
LA-0 in fender.
LA-0 in interior cavity. The interior is a large source of reflection.
LA-0 in interior cavity. The interior is a large source of reflection.

Absorber is required under the head liner, hood, behind the bumpers and everywhere on a vehicle where reflection may be a problem. This of course requires fiberglass or plastic body panels which are permeable to the appropriate frequencies. The thicker the absorber the greater the distance available for attenuation and thus less reflection. A 3/4" absorber is ideally suited due to its good absorption but it may be too thick to use under the headliner where a 3/8" panel may be more practical. The LA-0 material is lightweight (3 lbs/ft**3), flexible and available in 3/8, 1/2, 3/4, 1 and 1 1/8 inch thicknesses. The thicker absorbers have better performance when attenuating the lower frequencies.

Further design considerations: The rear window louvers used in this vehicle are an Astra plastic unit. They are not quite as aesthetically pleasing as the aluminum units but the plastic unit has a much lower RCS.

Note: Metallic paint gives your vehicle an electromagnetic signature which can't be ignored. It is also radiopaque. Avoid metallic paint completely.

(Disclaimer: Of course we are talking about your stereo.)