Goal
Capture ambient electromagnetic radiation and convert it to usable electrical power for small electronic devices and wireless sensors.
Problem
Lack of low-cost, self-powered energy sources for distributed wireless sensors and low-power electronics.
Concept Summary
An ultra-wideband antenna printed on paper or flexible polymer using inkjet-deposited silver and carbon-nanotube inks captures ambient RF energy (radio, TV, cellular, satellite). The captured AC is rectified to DC, stored in capacitors or super-capacitors, and used to power sensors, microcontrollers, or other low-power devices.
Principles
- Electromagnetic energy harvesting
- Ultra-wideband antenna operation
- Inkjet printed conductive nanomaterials
- Rectification and energy storage
Scientific Domains
Materials
- Silver nanoparticles
- Carbon nanotubes
- Paper substrate
- Flexible polymer substrate
Mechanisms of Action
- Broadband antenna captures ambient RF fields
- Diode rectifier converts RF AC to DC
- Capacitors/super-capacitors store harvested energy
Energy Sources
Applications
- Wireless environmental monitoring
- RFID and inventory tracking
- Structural health monitoring
- Wearable biomedical monitoring
- Backup power for low-power devices
Claimed Performance
Hundreds of microwatts from TV bands; multi-band systems expected to generate >=1 mW; with super-capacitor integration devices >50 mW.
Experimental Evidence
A temperature sensor was successfully operated using RF energy captured from a television station 0.5 km away.
Replication Status
Demonstrated by Georgia Tech research team; no independent third-party replication reported.
Limitations
- Power output limited to microwatt-millwatt range
- Reliance on sufficient ambient RF field strength
- Durability of printed conductive inks under harsh conditions
