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Recently, American engineers have developed a technology called "environmental backscatter", environmental backscatter, also known as WiFi backscatter, which enables two radiofrequency-powered devices without batteries to communicate
by "backscattering" existing wireless signals.
At present, the research team has developed a PoWiFi router, the so-called PoWiFi router can power a camera without a battery at a distance of 5 meters, and the WiFi network speed is not affected
.
The router used in the test emits radio waves, which are then converted into DC voltage
by so-called "rectifiers".
This is similar
to the process by which solar panels convert light energy into electricity.
A DC-DC converter is then used to increase the signal voltage to meet the requirements of
the sensor or microcontroller.
According to the British "Daily Mail" website reported on June 3, researchers at the University of Washington in the United States first demonstrated this technology
in August last year.
Assistant Professor Gorakota's technique is not the first to draw power from ambient radio frequency sources, but it is the first to connect to a network without relying on a dedicated gateway, such as an RFID reader
.
Specifically, the team reused existing WiFi infrastructure to provide connectivity for low-power devices
.
Since the technology utilizes existing ambient radio frequency signals around us, there is no need for specialized power supply infrastructure
.
Recently, American engineers have developed a technology called "environmental backscatter", environmental backscatter, also known as WiFi backscatter, which enables two radiofrequency-powered devices without batteries to communicate
by "backscattering" existing wireless signals.
At present, the research team has developed a PoWiFi router, the so-called PoWiFi router can power a camera without a battery at a distance of 5 meters, and the WiFi network speed is not affected
.
The router used in the test emits radio waves, which are then converted into DC voltage
by so-called "rectifiers".
This is similar
to the process by which solar panels convert light energy into electricity.
A DC-DC converter is then used to increase the signal voltage to meet the requirements of
the sensor or microcontroller.
According to the British "Daily Mail" website reported on June 3, researchers at the University of Washington in the United States first demonstrated this technology
in August last year.
Assistant Professor Gorakota's technique is not the first to draw power from ambient radio frequency sources, but it is the first to connect to a network without relying on a dedicated gateway, such as an RFID reader
.
Specifically, the team reused existing WiFi infrastructure to provide connectivity for low-power devices
.
Since the technology utilizes existing ambient radio frequency signals around us, there is no need for specialized power supply infrastructure
.
