Research

Poster Presentation

Innovation Fair 2024 

Place: Senate Bhaban, University of Dhaka, Bangladesh

Date: March 04, 2024

Title: Shining Light on Innovation: Advancing Ultra Low Power RF Energy Harvester for Wearable Technologies 

Supervisor: Dr. Khaleda Ali, Associate Professor, Dept. of EEE, University of Dhaka, Bangladesh 

Collaborators: S.M. Rakibul Hasan Shawon, Himel Bhuiyan, Raunak Al Jami, Md. Sadbin Hasan, Ahnaf Kamal

In this poster presentation, we demonstrated a CP MIMO antenna system with a gain of 7.15 dB integrated with a single-stage Cockcroft-Walton rectifier circuit on FR-4 substrate, operating at 4.12 GHz frequency with peak conversion efficiency (PCE) of 30.74%. Our proposed system generates up to 100 μW power, suitable for driving low-power sensors like temperature and electrochemical sodium sweat sensors. [poster] [slides] [demo]

B.Sc. Final Year Project                                              

January 2023

Title: Design and Construction of an Ultra Low Powered Energy Harvesting System for Wearable Applications

Supervisor: Dr. Khaleda Ali, Associate Professor, Dept. of EEE, University of Dhaka, Bangladesh 

Collaborator: Jagonnath Biswas, Dept. of EEE, University of Dhaka, Bangladesh 

In this project, a low-power Wi-Fi energy harvesting system has been designed for wearable applications. Our proposal consists of a high-gain two-element antenna array combined with a miniature rectifier circuit and impedance matching unit for energy harvesting. The resonating frequency is set to 2.45 GHz. Since the antenna is intended to capture only ambient Wi-Fi energy. Additionally, fabrication and experimental measurements have been performed for the antenna. In addition, experimental setups have been conducted to demonstrate the amount of energy received by the antenna from nearby routers. Then, this antenna is combined with a single-stage, L-shaped impedance-matched Cockroft-Walton voltage multiplier to produce DC power in the hundreds of microwatts range. Such a low-power and lightweight Wi-Fi energy harvesting system will be suitable for body area networks.