Mobile wifi hotspot is a technology that converts GPRS, 3G or 4G signals received by mobile phones into wifi signals, so that portable devices such as mobile phones, tablets or notebooks can use wireless network cards or WLAN modules to be used outdoors or where there is no network. Can access the Internet to achieve network resource sharing. A mobile phone must have a wireless AP function to be used as a hotspot. At present, most smart phones have their own hotspot function.
Wireless access to WiFi hotspots has become the standard way for many devices to access the Internet. When you go out, if you carry a portable device that supports WiFi wireless network, such as PSP, iPad WiFi version, etc., you will have great restrictions on surfing the Internet at any time. You must find a place that provides free WiFi wireless hotspot network, such as Starbucks, McDonald's, Countryside or Internet access is only available in designated areas of the hotel. This directly limits the significance of portable devices being easy to carry. At the same time, these devices do not have network access conditions such as 3G or GPRS, so is it impossible to access the Internet at any time? In fact, as long as you have a mobile phone with an Android system, you can make Your mobile phone that surfs the Internet wirelessly through the GPRS network turns into a WiFi hotspot, and then turns on the iPad, and the iPad can access the Internet at any time, which is very convenient.
In fact, the signal emitted by the mobile phone WiFi hotspot is the same as the WiFi signal frequency band and the Bluetooth frequency band emitted by the router. The Wi-fi technology is defined by IEEE 802.11b/g/n, and its operating frequency is 2.4ghz, of which the 2.4ghz spectrum is Divided into 14 overlapping and staggered 20 MHz wireless carrier channels, each with a center frequency of 5 MHz. 802.11a/n has more channels in the 5.0GHz spectrum, and 802.11n also uses channel welding techniques to combine two 20MHz carrier channels into a single 40MHz channel to increase throughput.
The wifi jammer can transmit signals in the above frequency bands, so that mobile phones and other communication devices within a certain range can receive the signals transmitted by the mobile phone signal jammer, so as to achieve the purpose of shielding the signal.