Characteristics and shielding principle of aluminum foil tape
Aluminum foil tape has the characteristics of isolating electromagnetic waves. It is widely used in refrigerators, air conditioners, automobiles, petrochemicals, bridges, hotels, electronics and other industries; the shielding principle of aluminum foil tape is introduced as follows: 1. Reflection loss caused by impedance mismatch on the surface of the shielding body . 2. When the electromagnetic wave is transmitted inside the shielding material, the electromagnetic energy is absorbed causing transmission loss or absorption loss. 3. Multiple reflection losses caused by multiple reflections of electromagnetic waves between the inner walls of the shielding material. Through these points, we can see three basic factors that affect the shielding effectiveness of materials, namely the electrical conductivity, magnetic permeability and material thickness of the material. This is also the problem and breakthrough that the shielding material research itself must pay attention to. For the structure of the electromagnetic shielding body, its shielding effectiveness is also related to the structure, shape, airtightness, etc. For specific problems, we also need to consider the frequency of the electromagnetic wave to be shielded, the nature of the field source, etc. Because aluminum foil is metal, it will conduct electricity by itself. Through the above shielding principle, we also know why it is suitable for various electronic devices such as transformers, mobile phones, computers, PDAs, POPs, LED displays, notebook computers, copies, etc. The place in the product that needs electromagnetic shielding.