iron-based alloy absorbing patchs 

Some commonly used materials for electromagnetic wave absorption patches include: 1. Ferrite: Ferrite materials, such as nickel-zinc ferrite or manganese-zinc ferrite, have high magnetic permeability and are effective at absorbing electromagnetic waves in the low-frequency range. 2. Conductive polymers: Conductive polymers, such as polyaniline or polypyrrole, have high electrical conductivity and can absorb electromagnetic waves in the high-frequency range. 3. Carbon-based materials: Carbon-based materials, such as carbon nanotubes or graphene, have excellent electrical conductivity and can absorb electromagnetic waves across a wide frequency range. 4. Metal-based materials: Metals, such as copper or aluminum, have high electrical conductivity and can absorb electromagnetic waves in the higher frequency range.