Ultra-Wideband (UWB: UItra-Wide Band) patch antenna introduction
With the rise of the Internet of Things, UWB technology applications usher in more opportunities. Compared with other positioning technologies, UWB has many advantages such as high precision, good security, fast transmission speed, large system capacity, low power consumption, and strong anti-interference ability.
The so-called UWB, that is, ultra-wideband technology, is essentially a kind of wireless communication technology. But compared with Bluetooth, Wifi, etc., UWB has the following advantages:
1 Strong anti-interference performance
UWB adopts time-hopping spread spectrum signal, and the system has a large processing gain. When transmitting, the weak radio pulse signal is dispersed in a wide frequency band, and the output power is even lower than the noise generated by ordinary equipment. When receiving, the signal energy is restored, and the spreading gain is generated in the process of despreading. therefore. Compared with IEEE 802.1la, IEEE 802.1lb and Bluetooth, under the same code rate, UWB has stronger anti-interference.
2 High transfer rate
The data rate of UWB (Ultra Wide Band, ultra-wide band) can reach tens of Mbit/s to hundreds of Mbit/s. It is expected to be 100 times higher than Bluetooth, and also higher than IEEE 802.1la and IEEE802.1lb.
3 Very wide bandwidth
The bandwidth used by UWB is above 1GHz, up to several GHz. The UWB system has a large capacity and can work simultaneously with the current narrowband communication system without interfering with each other. This is in today's increasingly tight frequency resources. A new time-domain radio resource is opened up.
4 Low power consumption
usually. A wireless communication system needs to continuously transmit carrier waves during communication, and therefore consumes a certain amount of power. UWB, on the other hand, does not use a carrier wave. It only sends out instantaneous pulse radio waves, that is, directly press O and 1 to send out, and only sends out pulse radio waves when needed, so the power consumption is small.
5 Good confidentiality
The confidentiality of UWB is manifested in two aspects: on the one hand, time-hopping spread spectrum is used, and the receiver can only decode the transmitted data when it knows the spreading code of the transmitting end; on the other hand, the transmit power spectral density of the system is extremely low. Unable to receive with conventional receivers.
6 The sending power is very small
The transmission power of the UWB system is very small, and the communication equipment can realize communication with the transmission power less than 1mw. Low transmit power greatly prolongs the working time of the system power supply. Moreover, the transmission power is small, and its electromagnetic wave radiation will have little impact on the human body. In this way, the application of UWB is more extensive.
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