University of Washington On July 5, 2017, engineers at the University of Washington designed the world's first mobile phone that can be used to dial batteries without the need for a battery. It can collect energy from ambient radio waves or light. . The research team assembled the prototype of the batteryless mobile phone using commercial off-the-shelf components and conducted tests to communicate with the base station.
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Researchers believe that the process of converting analog signals into telephones to understand digital data is the main power-consuming link. Without this change, it is impossible to design a battery-free mobile phone. The battery-free mobile phone developed this time uses the vibration of the microphone and speaker when making a call. The vibration is converted to a modification of the standard analog radio signal transmitted by the cellular base station via an antenna coupled to these components. This process of converting speech to analog signals has almost no power consumption.
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In order to transmit voice, a batteryless telephone uses a microphone to vibrate to change the voice into a reflected signal. In order to answer the voice, the batteryless phone converts the encoded radio signal into the sound vibration of the speaker. In the prototype, the user switches the send and receive modes with a single button.
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By installing commercially available components on the circuit board, the research team demonstrated that a battery-free mobile phone prototype can perform basic telephony functions, including sending voice, data, and receiving input from buttons. By using SKYPE software, users can receive calls, dial and answer waiting.
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The research team designed a custom base station for transmitting and receiving radio signals, which can be integrated into existing standard mobile phone network infrastructure and WIFI routers.
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A battery-free mobile phone actually needs some power to operate, and the prototype is designed to have a power of 3.5 microwatts. Researchers at the University of Washington demonstrated two ways to collect energy from the environment, including collecting energy from radio signals transmitted by telephone base stations 10 meters away. Using the rice-sized solar cells to collect the ambient light, the battery-free mobile phone prototype can be driven to communicate with the base station outside the 15th.
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Mobile phone calls require constant power protection, which is the biggest challenge in energy-free collection of battery-free mobile phones. There are many energy harvesting technologies, such as thermoelectricity, accelerometers, and vibration energy harvesting. But these energy harvesting techniques are unable to keep the phone running continuously during the call.
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The researchers' next steps include further improving the call distance of battery-free mobile phones, making calls more secure through encryption, and installing an electronic ink screen to display video information.
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