Quarter Wavelength Absorber

• ECCOSORB^® SF
• Reflection off the front face is modified in amplitude and phase based upon the material properties.
• Transmitted wave is modified in amplitude and phase by transmission through front face, propagation through material, reflection off backing surface and transmission back through front face.
• When primary reflection and secondary reflection are identical in magnitude and 180 degrees out of phase, reflection minimum occurs. Phase cancellation occurs when thickness of material is ¼ wavelength. Hence ECCOSORB^® SF or any other single layer homogeneous absorber is inherently narrowband