What is portable wifi like?

To understand the principle of portable wifi

First, we need to know the purpose of carrying it with us.

Now everyone says that the distance in the world is "disconnected";

In order to let us enjoy the Internet anytime and anywhere,

We have developed all kinds of network devices,

However, due to various factors such as cost and power consumption,

They can't access the Internet directly by installing a sim card, and even the network cable is inconvenient.

Therefore, a networking device that can solve the problem of short-distance connection is developed, which is not limited by geographical area and bound by network cable.

It is a portable wifi；;

Portable wifi mainly includes two parts.

① Internet access module (including 4G/5G network group module or broadband signal module)

(2) Send and receive wifi signals (multiple devices can also form a local area network without surfing the Internet).

The main parts are as follows:

Schematic diagram of 4G portable wifi

Wifi is a wireless network transmission protocol, also called IEEE802. 1 1b.g.n protocol stack and TCP/IP protocol stack.

All devices installed with wifi module can be connected seamlessly.

Whether it is thousands of high-end routers or a few dollars of wifi modules, everyone is equal;

Its main operating frequencies are 2.4GHz and 5GHz (different from 5G in mobile networks).

2.4GHz？ decimetric wave

Advantages: long wavelength, good penetration, suitable for long-distance transmission, compatible with most equipment;

Disadvantages: slower than 5GHz network speed,

Because there are many other electrical equipment working at this frequency, the interference will be relatively greater;

5GHz？ centimetre wave

Advantages: Compared with 2.4GHz, the network speed is faster and less interfered by other devices;

Disadvantages: short wave length and poor penetration, suitable for short-distance transmission;

Talk about the specific conversion process:

When you want to surf the Internet, it will convert the request information you sent into binary code (the language recognized by CPU, namely 0 and 1), and then these 0 and 1 will be converted into wave frequency by the wifi chip embedded in the device.

The frequency is transmitted to a wifi router through a wireless channel to be received,

Then the wifi router converts the frequency back to the binary code and converts the code into the Internet information you requested.

Wifi routers connect to the Internet through broadband or 4G/5G networks (SIM cards) to receive data.

Portable WiFi

For users, it is much simpler.

After we have a portable wireless network,

It can be directly used by 10 people, and the 4G network can be used after the traffic packet is recharged;