EMI Absorber Materials for Flexible Cable Suppression
Electromagnetic interference (EMI) presents specific challenges for flexible cables such as FFCs and FPCs, as traditional shielding materials like copper or aluminum layers are not always easy to integrate into flexible portions due to stiffness .
The Challenge:
Flex cables are thin, bendable interconnects fitting into tight spaces
Traditional metallic shielding adds rigidity, defeating the purpose of a flex cable
EMI becomes more significant in applications with rapidly changing electrical signals
EMI Absorber Solution:
EMI absorbers are flexible composite sheets incorporating specialized magnetic particles
They absorb and dissipate electromagnetic energy rather than reflecting it like metal shields
Magnetic permeability (high μr materials like ferrites) helps absorb EMI and convert it to heat
Application Strategy:
For broadband EMI control, metallic shielding remains preferred. In many designs, shielding and absorption are used together: metal layers provide reflection and containment, while EMI absorbers address localized noise and resonances in flexible or space-constrained regions .
