CROWN EMI Absorber Solutions for Different Frequency Bands

Absorber materials are composite functional materials prepared by incorporating absorbing agents into polymer matrices through specialized processes. They can absorb and attenuate incident electromagnetic waves and further reduce wave intensity through electromagnetic interference, making them essential for mitigating EMI in electronic devices.

To address EMI issues across different frequency bands, CROWN offers a comprehensive EMC management solution, including the EM91 series for conventional absorption and the EM92 series for high-frequency absorption, providing full-spectrum protection for electronic devices

• EM91 Series – Conventional EMI Absorber: Designed for EMI scenarios in the 0–3 GHz frequency range, these materials feature high magnetic permeability to effectively absorb low-frequency interference. Backing thickness can be customized per client requirements. The products are halogen-free, RoHS-compliant, and exhibit excellent aging resistance, ensuring stable device performance.
• EM92 Series – High-Frequency EMI Absorber: Targeted at 1–10 GHz applications, these materials offer good flexibility and multiple thickness options, enabling use in complex structural spaces. In 2.4 GHz high-frequency environments, they effectively suppress harmonic interference, making them ideal for wireless communication devices.

CROWN’s EMI Absorbers are widely applicable in smartphones, laptops, and other external electronic devices. For example:

• Smartphones: Can be applied on screen back adhesives, CPU/GPU modules, SIM cartod bases, flexible EM touch panels, and metal backplates.
• Laptops: Suitable for positioning above and below CPU/GPU, alongside memory modules, WiFi modules, and USB daughterboards, reducing EMI between components and enhancing system stability.

In NFC (Near Field Communication) applications, EMI Absorbers also play a crucial role. For instance, EM9105 can be laminated using PET double-sided tape for EMI protection in access cards. When used near metal card readers, the material effectively isolates metal interference on the antenna’s magnetic field, improving communication performance and NFC recognition stability.

With the ongoing trends of higher frequency, miniaturization, wireless connectivity, and intelligent electronics, EMI Absorbers are evolving toward multi-band, high-performance, and customizable solutions. Leveraging strong R&D capabilities and professional project management, CROWN New Materials provides tailored EMI solutions and technical support, enabling electronics manufacturers to achieve more stable, efficient, and intelligent product designs.