Absorbers
Available in many different shapes and sizes, but they are all used to reduce reflections, oscillations, surface currents and to improve isolation in RF & Microwave applications.

Flat, thin absorbers approximately 0.2 to 10 mm thick, are used in electronic apparatus to reduce unwanted oscillations or to improve the isolation between different parts of the construction. They can be made of foam (wide band) which is available in single layer (cheaper) or multi layer (a bit more effective), or in rubber or plastic material which is magnetic/MAGRAM (frequency tuned and thinner).

Keep in mind that the attenuation figures are measured in the Far field (where the electric field is stronger) and most often the situation is that they need to work in the Near field (close to the radiation source where the magnetic field is stronger). We have specialized absorbers optimized for Near field suppression, but often a reduction of the surface currents is enough to get rid of oscillations or to improve isolation. For this a thin foam absorber may be enough. Try the absorbers supplied in our Survival Sample Kit, which you can get from us free of charge.

Last but not least we have absorbers also for measurement chambers, where the absorber is covering the walls to reduce reflections. Cone absorbers works fine down to maybe 500 MHz but is then getting very long since the absorber cone length is related to the wavelength. So lower in frequency ferrite tiles are used. If the ferrite absorber is combined with a cone absorber with slightly lower carbon content (it gets a bit transparant to the RF) the absorber gets efficient from very low to high frequencies.