The difference between absorbing materials and shielding materials for automotive electronics, autonomous driving, and drones

1Absorbing materialIt refers to a type of material that can absorb the energy of electromagnetic waves projected onto its surface. Through various loss mechanisms of the material, the incident electromagnetic waves are converted into thermal energy or other forms of energy to achieve the purpose of absorbing electromagnetic waves. In engineering applications, in addition to requiring absorbing materials to have high absorption rates for electromagnetic waves in a wide frequency band, they also require properties such as temperature resistance, moisture resistance, lightweight, and corrosion resistance. The absorption effect of absorbing materials is determined by various electromagnetic mechanisms inside the medium, such as resonance absorption, electron diffusion, micro eddy currents, and so on.

Soft and non fragile, lightweight, easy to process and cut, convenient to use, can be installed in small spaces

The product needs to be bonded or pressed onto a metal substrate to achieve good absorption effect

The product can correspond to a variety of sizes and shapes

High temperature resistance and good flexibility

• Halogen free, lead-free, compliant with RoHs instructions

Product application:

Can be used as a noise countermeasure for flexible cables for mobile devices. (Laptops, game consoles, handheld devices, etc.)

Reduce the radiation noise of various electronic devices. (Noise generated by CPU, etc.)

Reduce the electromagnetic radiation (SAR) of mobile phones on the human body.

Reduce internal EMI (resonance, crosstalk) within the shielding frame.

Reduce the coupling conducted radiation interference between low frequencies and minimize the low-frequency echo interference.

Absorbing materialThe application

1. Can be used inside electronic device cavities such as laptops, mobile phones, and communication cabinets.

2. Can be used to reduce radiation and noise from various electronic devices.

3. Can reduce coupling conducted radiation interference between low frequencies and minimize low-frequency echo interference

4. Can reduce internal EMI (resonance, crosstalk) within the barrier frame.

5. Applied between chips and heat dissipation modules.

6. Application of EMI/RFI: EMI is electromagnetic wave interference. The three elements of electromagnetic wave interference are interference source, interference propagation path, and sensitive equipment. Interference sources refer to electronic devices or systems that generate electromagnetic interference, which can propagate through cables, space, etc. Sensitive devices refer to electronic devices or systems that are easily affected by electromagnetic interference. RF Interference: Radio frequency is a high-frequency alternating current, commonly known as electromagnetic waves. Radio frequency interference is the interference caused by electromagnetic waves. Two electromagnetic waves with similar frequencies will be simultaneously received by the receiver, causing interference. There will be harmonic interference near the transmitter. Interference with other receiving devices. Electromagnetic waves at the same frequency can interfere with radio stations.

2、 Shielding materials are a type of material that can isolate metal, magnetic fields, electromagnetic waves, and control electric fields between two spatial regions, inducing and radiating from one region to another. Specifically, it refers to the material used to manufacture shielding bodies. Shielding bodies surround the interference sources of components, circuits, assemblies, cables, or the entire system to prevent the electromagnetic field from spreading outward. Shielding bodies are used to wrap receiving circuits, equipment, or systems to prevent them from being affected by external electromagnetic fields. Absorbing materials do not necessarily reflect electromagnetic waves, but electromagnetic shielding materials reduce the amount of electromagnetic waves reaching the other side of the shielding material through both absorption and reflection.
so to speakAbsorbing materialThe purpose is to minimize the reflection of electromagnetic waves on the same side of the absorbing material and the electromagnetic wave source, while the electromagnetic shielding material is to minimize the impact of electromagnetic waves on the opposite side of the shielding material and the electromagnetic wave source. The electronics industry is constantly changing, which poses many challenges for material solution providers. Under the trends of 5G, automotive electronics, autonomous driving, drones, AI, AR/VR, electronic products will continue to iterate and update, requiring higher computing power for chips and facing problems such as increased power consumption, radiation, and heat dissipation. This puts higher demands on the development capabilities and corresponding technical support of advanced technology institutes.