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Radio-Frequency Energy Harvesting and Wireless Power Transfer System

Technology Overview

The proliferation of Internet of Things (IoT) allows more sensors to be used for monitoring, detection, and security purposes. However, this also introduces new problems to the user:

  • Short sensor's lifespan (due to reliance on battery as the main power source) affecting the service operation,
  • Cost and hassle associated with frequent maintenance and battery disposal, especially when sensors are scattered across multiple locations and can run out of battery at different points in time, and
  • Time wasted on planning, coordinating, and installing of power cord layout to accommodate increasing numbers of sensors (for sensors using power cord as the main power source).

Hence, conventional powering methods are not sustainable to support thousands of sensors. This technology offer presents a wireless power transfer technology to solve the problems. The system can be integrated into the sensors and provides alternative power source to the sensors, effectively extending the sensor's lifetime and resulting in less frequent replacement/maintenance. This can help to remove the costs associated with battery replacement, battery disposal, and cabling installation.

Technology Features, Specifications and Advantages

A complete power and data transfer system consisting of the following :

  • Power harvesters to harvest the Radio-frequency signal and convert to direct current (DC). This unit is used to provide power to the sensor
  • Power transmitters to emit the power signal for remote charging
  • Gateway that receives the data from the sensors and uploads to the cloud for remote access and monitoring

In short, our system not only retains the key benefits that IoT bring (more data for analysis and insight) but also enable scaling by removing the power reliance.

Key features :

  • Long-range wireless power charging to extend the sensor’s lifetime operation
  • Sensor information is securely transferred to the gateway and uploaded to the cloud via multiple protocols such as Wi-Fi, ModBus, LTE-M/NB-IoT
  • Patented technology to enable robust, efficient, and long-range wireless power and data transfer system
  • Supporting a wide range of sensors, such as temperature, humidity, pressure, light, and gas

In short, our system not only retains the key benefits that IoT bring (more data for analysis and insight) but also enable scaling by removing the power reliance.

Potential Applications

Applications requiring extensive uses of sensors can benefit from the technology, such as:

  • Environmental monitoring (temperature, humidity, gas…)
  • Facility management (office, building, museum, …),
  • Smart metering (water meter, gas meter),
  • Asset management (in warehouse or on-route, where conditions of items are to be monitored closely).

Customer Benefit

  • Cost saving on battery replacement and maintenance – the use of wireless power transfer technology has potential to realize long sensor’s lifetime and battery-less operation
  • Avoid service disruption – without the hassle of battery replacement, the data collection process is not interrupted, and no critical data is lost
  • Easily scalable solutions – by simply placing new devices within the charging zone
Contact Person

Thet Aung Zaw


NUS Graduate Research Innovation Programme (NUS GRIP)

Technology Category

  • Electronics
  • Radio Frequency
  • Green Building

Technology Readiness Level


Sustainable energy, green energy, wireless energy, RF energy, battery-free IoT