1170 7.7"X10"

RFI and EMI - Shielding and Absorbing Materials

The 1170 7.7"X10" application field and working principle of RFI and EMI shielding and absorbing materials are key factors in the design and implementation of modern engineered electromagnetic systems. In general, RFI and EMI shielding and absorbing materials are commonly used in the attenuation of electromagnetic waves in order to protect sensitive components from electrical interference and reduce radiation. In order to better understand how these shielding and absorbing materials work, it is important to understand their application fields and working principles.

Application Field

The 1170 7.7"X10" application field of RFI/EMI shielding and absorbing materials includes the application of radiation-resistant insulation materials and shielding devices in a variety of electronic applications. This is usually done to prevent interference with electromagnetic compatible (EMC) or sensitive (EMS) components as well as avoiding the effects of radiated emissions. These RFI/EMI shielding and absorbing materials are most commonly found in the following applications:

• High-frequency digital and microwave components, such as amplifiers, tuners, transmitters, and receivers.
• RF shielding enclosures for medical equipment, scientific laboratory equipment, and advanced communication systems.
• Automotive systems, including onboard computers, sensors, and wireless communication systems.
• Industrial automation and process control applications.
• Manufacturing, electric power, and oil and gas industries.

Working Principle

RFI and EMI shielding and absorbing materials work by attenuating reflected and direct radiation from electromagnetic sources, thus reducing unwanted emissions and protecting both the source and the device in which the material is used. The materials absorb or reflect the electromagnetic wave by reflecting the wave back to the source, decreasing the signal strength which in turn reduces the electromagnetic interference.

The shielding properties of the material depend on the frequency of the electromagnetic wave, the angle of incidence of the wave on the material, the conductivity of the material, and the presence of other items such as magnetic fields. The material’s height and width can also affect the shielding performance. For example, a smaller-sized shielding material can still provide some attenuation of the wave, but a larger size increases the ability of the shielding material to reflect back the wave.

Absorbing materials also work to reduce the impact of electromagnetic radiation on an object. By reducing the energy of the wave, the material absorbs the wave so that the object can remain in the desired state with minimal disruption. Absorbing materials absorb the waves either by dissipating heat or by responding to tiny variations in the electric and magnetic fields in the material.

Conclusion

RFI and EMI shielding and absorbing materials are important in the design and implementation of modern engineered electromagnetic systems. By understanding their application fields and working principles, design engineers can make the most of the shielding and absorbing materials available to prevent interference and minimize radiation.