In this modern society full of wireless signals, our mobile phones, tablets and other electronic devices are always sending and receiving various signals. Sometimes, we hope that these devices can be "quiet", not disturbed by external signals, and not send any signals. At this time, mobile phone shielding bags, also known as Faraday bags, come in handy.
1. What are mobile phone shielding bags and Faraday bags?
The main purpose of mobile phone shielding bags and Faraday bags is to block wireless signals from electronic devices. These bags are usually made of special materials and can effectively shield various wireless signals.
2. Working principle
To understand the working principle of mobile phone shielding bags and Faraday bags, we need to first understand some basic knowledge of electromagnetics.
Faraday cage effect
The shielding principle of Faraday bags mainly relies on the "Faraday cage effect". A Faraday cage is a closed space made of conductive material that blocks external electromagnetic fields from entering the cage. Here's how it works:
Electromagnetic field shielding: When electromagnetic waves (such as wireless signals) hit conductive materials, the free electrons in the material will rearrange themselves to produce an electric field opposite to the external electromagnetic field, thereby offsetting the effects of the external electromagnetic field. As a result, electromagnetic waves cannot penetrate the conductive material and enter the Faraday cage.
Complete enclosure: In order to achieve the ideal shielding effect, the Faraday cage must be completely enclosed so that electromagnetic waves cannot enter the cage from any direction.
3. Shielding effect
The shielding effect of mobile phone shielding bags and Faraday bags mainly depends on the following factors:
Material selection: The type and thickness of the shielding layer determine the shielding effect. Metal materials with strong conductivity and moderate thickness usually provide better shielding effects.
Enclosure: The opening of the bag must be designed to be tight enough to ensure that there are no gaps for electromagnetic waves to pass through. Some bags even use a double-layer enclosed design to improve the shielding effect.
Frequency range: Different bags have different shielding effects on electromagnetic waves of different frequencies. An ideal mobile phone shielding bag can shield all common wireless signal bands, including 2G, 3G, 4G, 5G, Wi-Fi, Bluetooth, etc.
4. Conclusion
mobile phone shielding bags and Faraday bags use simple but effective electromagnetic principles to help us block wireless signals when needed and protect privacy and information security. Although the principles of these bags seem complicated, they are very convenient and practical in daily life compared to cell phone jammer s.
