AI Servers, 5G, Automotive Electronics: Why Ferrite Absorber Plate Have Become The Standard For EMI

By 2026, electromagnetic interference shielding is no longer "optional" – high-density electronic systems almost all rely on it. Industry reports show that the global EMI shielding market will grow from $7.04 billion in 2025 to $7.41 billion in 2026, an annual increase of 5.3%. Among them, the high-frequency absorbing materials segment alone will reach $4.02 billion in 2026, with an annual growth rate as high as 8.14%. Consumer electronics, AI servers, automotive electronics, and 6G communications are all moving simultaneously toward higher frequencies, higher power densities, and more compact spaces. The difficulty of electromagnetic compatibility design has reached an all-time high. Ferrite absorber plate have also expanded from traditional anechoic chamber absorber walls to precision noise control applications at the circuit board, system, and antenna levels.

 AI Data Centers and High-Frequency EMI: Why Are Ferrite Absorber Plates Becoming Key Supporting Players?

In today's AI servers, GPUs are packed closely together, power module power is increasing, and switching frequencies are rising. This is like running several high-power appliances simultaneously in a small room – electromagnetic interference (EMI) becomes very severe. Data shows that in 2026, the market for inductive components such as inductors and transformers used in AI servers will reach $2.55 billion, with an annual growth rate of 23.07%. Why the rapid increase? Because AI training requires massive computing power, circuits in servers must run faster and denser, causing high-frequency noise to scatter everywhere.

In the past, solving EMI mainly relied on metal shielding cans – covering circuits with a metal shell. However, this method has two problems: it takes up space, and it can only block radiation but cannot absorb the reflected noise inside the cavity. Ferrite absorber sheets are different. They are thin and can be directly attached next to power modules on the PCB, near high-speed signal cables, or in the gaps of heat sinks. When high-frequency electromagnetic waves (200MHz–1GHz) pass through the absorber sheet, they are converted into weak heat and dissipated, effectively "eating" the radiation at the source.

As a result, devices are more likely to pass EMC certifications such as CISPR 32, without repeated board revisions, adding shields, or changing materials. Thus, more and more AI server designs are adopting absorber sheets as a standard – they are not "optional" but a key role in solving high-frequency EMI.

How Do Ferrite Absorber Plates Work?

Traditional ferrite absorbing materials are "large bricks" in anechoic chambers, used to absorb far-field reflections. Today's device-level absorber sheets are "thin patches" attached to circuit boards, using the loss characteristics of magnetic materials at high frequencies to convert near-field radiated energy into heat.

Five Major Scenarios: Applicable to Mobile Phones, AI, Automobiles, and Medical Devices

• Mobile/Wearable Devices: Attach near the processor or antenna to absorb 1–8 GHz stray radiation, preventing signal sensitivity degradation.
• AI Servers/High-Speed Switches: Attach inside the device casing or near connectors to absorb GHz-level radiation, reducing the risk of EMI test failures.
• Automotive Electronics (SiC/GaN Inverters): Attach on high-voltage lines or power module surfaces to suppress 30–200 MHz frequency radiation, meeting CISPR 25 Class 5 standards.
• Wireless Charging/NFC: Attach between the antenna and metal backplate to prevent eddy current loss, improving charging efficiency and card-reading success rate.
• Medical Imaging Equipment (MRI/CT): Attach around gradient coils or RF receiving coil loops to absorb eddy current noise and enhance image signal-to-noise ratio.