Have you ever wanted your phone to be "quiet" and no longer receive any signals in certain specific occasions? For example, in important meetings, exams, hospitals or other occasions where you need to keep quiet and focus. In addition to cell phone jammers, we can also use cell phone shielding bags.
A cell phone shielding bag, as the name suggests, is a small bag that can shield mobile phone signals. This bag looks simple, but it actually has a lot of secrets. Its key part lies in a special shielding material, which usually includes metal fibers or metal foils.
Outer material: This is the part we can see and touch, usually made of durable fabric, which protects the inner layer from wear and tear.
Shielding layer: This is the "secret weapon" of the bag. The shielding layer is made of metal fibers, metal mesh or metal foil, which is responsible for blocking electromagnetic signals.
2. Faraday cage effect
The reason why cell phone shielding bags can effectively shield signals mainly relies on the "Faraday cage effect". This principle was discovered by Michael Faraday, a physicist in the 19th century. A Faraday cage is a cage made of conductive material that can effectively shield external electromagnetic fields.
Electromagnetic wave shielding: When electromagnetic waves (such as mobile phone signals) encounter conductive materials, the free electrons inside the material will move to form an electric field opposite to the external electromagnetic waves, thereby offsetting the influence of external electromagnetic waves. This is like building an "invisible wall" outside the door to block all signals from entering.
Completely closed: To ensure the shielding effect, the bag must be as completely closed as possible. Even the opening of the bag must be designed very tightly to prevent signal leakage.
3. Working principle
When you put your mobile phone into the shielding bag and seal the bag, the metal fiber or metal foil inside the bag will form a small Faraday cage. This Faraday cage can effectively prevent external signals from entering the mobile phone, and also prevent the signals sent by the mobile phone from spreading out.
Signal blocking: Whether it is 2G, 3G, 4G, 5G, or various signals such as Wi-Fi, Bluetooth and GPS, they will be reflected and absorbed by the shielding layer and cannot penetrate the bag into the mobile phone.
Two-way shielding: Not only can external signals not enter, but the signals of the mobile phone cannot be sent out. This means that when your phone is in the bag, it is like it is completely "out of touch".
4. Practical application
cell phone shielding bags have many application scenarios in real life:
Meetings and exams: In situations where concentration is required, shielding bags can prevent mobile phone interference and improve efficiency.
Privacy protection: Prevent mobile phones from being remotely controlled or eavesdropped, and protect personal privacy.
Anti-theft protection: Prevent signals from devices such as car keys from being copied, and improve security.
Medical and laboratory: Avoid mobile phone signals from interfering with sensitive equipment to ensure accurate operation.
5. Usage tips
It is very simple to use a cell phone shielding bag. Just put the phone in the bag and seal the bag. However, remember not to forget to take the phone out of the bag at an important moment, otherwise you may miss important calls or messages!
In short, the cell phone shielding bag effectively shields various wireless signals through the Faraday cage effect, and is a practical gadget in modern life. Whether it is protecting privacy, improving concentration or preventing signal interference, cell phone shielding bags can play an important role.