The world's first 'mobile phone that does not require a battery' is born

Mobile phones became a necessity indispensable for daily life, but once the battery runs out, it can not be used, so at the same time the problem of running out of the battery has become inevitable. Researchers at the University of Washington developed the world's first "cell phone powered without batteries" to solve such a problem of the battery of the mobile phone.

Battery-Free Cellphone - batteryFreePhone.pdf
(PDF file)http://batteryfreephone.cs.washington.edu/files/batteryFreePhone.pdf

Battery Free Phone
http://batteryfreephone.cs.washington.edu/

Say What? Researchers Develop First Battery-Free Mobile Phone | HotHardware
https://hothardware.com/news/researchers-develop-first-battery-free-mobile-phone

You can check on what type of mobile phone "Battery-Free Cellphone" can talk without batteries in the following movie.

Battery-free Cellphone - YouTube


The terminal exposed in this substrate is "Battery-Free Cellphone". As its name suggests, it is the world's first batteryless mobile phone.


Battery-Free Cellphone does not have a monitor to reduce power consumption to the limit. The way to call is simply a simple thing to do a dial button.


Skype is used for voice call of Battery-Free Cellphone. Instead of a conventional analog-to-digital converter that converts voice to data, it adopts a system that uses data of vibrations of microphones and speakers for data conversion.


A man who answers "Hello" to a call from Battery-Free Cellphone.


I heard the other party's voice from the earphone attached to Battery-Free Cellphone.


Battery-Free Cellphone has a button to switch between the voice listening mode and the sound transmitting mode.


When talking to you, talk about it while holding down the dedicated switching button so that it approaches the mouth.


Instead of supplying power from the battery, the Battery-Free Cellphone receives RF signals from terminals that are surrounding base stations, performs power conversion, supplementally uses a very small photodiode that generates power from surrounding light By doing so, we realize a phone call without batteries. While a general smartphone's liquid crystal display requires about 3.5 W of electricity, Battery-Free Cellphone drives at only a few micro W.


The Battery-Free Cellphone seems to be able to generate electric power from a terminal at a distance of up to 50 feet (about 15 meters), and the prototype machine receives an RF signal from a terminal at a distance of 31 feet (about 9.4 meters) and talks I am particularly successful. In the future, if we utilize the mechanism to generate RF signals from Wi-Fi router, we will be able to make cell phone calls without batteries.