Adaptive Impedance Matching for 5.8 GHz Energy Harvesting Circuitry
Georgia Tech
Funded by Children's Healthcare of Atlanta (CHOA)
Students: Damilola Apatira, Kevin Berman, Shadrach Hepner, Olivia Wasdin

Challenges occur when trying to provide maximum power transfer in RFID energy harvesting circuitries due to mismatches in impedance between the antenna and the load. This research proposes an implementation of a 5.8 GHz energy harvesting circuit that matches itself to a variable load via a single control line from the microcontroller to increase efficiency.

Wireless Wearable Moisture Monitoring System
Georgia Tech
Funded by Children's Healthcare of Atlanta (CHOA)
Mentors: Dr. Greg Durgin and Andrew Kirsch, M.D.

The Wireless Wearable Moisture Sensor (WiWeMS) is an inexpensive radio frequency identification (RFID) system to quantitatively measure moisture and wirelessly send the data to a small reader 5 to 10 meters away. Children of all ages and adults with enuresis struggle with incontinence. The WiWeMS monitoring system helps to solve this problem without using a battery or external antennas as other solutions have used in the past by using backscatter radio. The final diaper inlays will use an integrated circuit (IC) to reduce the cost down to $0.16 or less and can be used for various applications such as hospital surveillance, home nocturnal void testing, and daily monitoring in a classroom setting.

RFID Antenna Detuning
Georgia Tech
Funded by ORS Georgia Tech
Students: Damilola Apatira, Kevin Berman, Shadrach Hepner, Kyle Kizirian 
Mentors: Blake Marshall, Dr. Greg Durgin

For this project, I led a group of four undergraduate students investigating how antennas detune in RF harsh environments. Detuned antennas can weaken or completely disrupt communications for RFID systems and wireless sensor networks. Each student learned how to build antennas for different frequencies and discover techniques to prevent antenna detuning in harsh environments. For a research contribution, the students measured experimental data for different canonical antennas in different environments such as inside a wet diaper.

Staggered Pattern Charge Collector
Georgia Tech
Propagation Group
Mentor: Dr. Greg Durgin

This project's goal was to design a group of sub-arrays to improve wireless RF energy harvesting. The SPCC uses multiple sub-arrays to create multiple main beams aimed in different directions to create a high gain and high beamwidth aggregate gain pattern.

Hydrocephalus Integrated Circuit System
Georgia Tech
Analog IC System Design Project
Mentor: Dr. Maysam Ghovanloo

This project's goal was to design a IC system to replace shunts in the head to maintain inter-cranial pressure for people with hydrocephalus. Our team of four was responsible from problem description through to layout of the IC chip just short of fabrication.

Intentional Electromagnetic Interference
Rose-Hulman Institute of Technology
Funded by US Air Force Research Lab
Mentor: Dr. Edward Wheeler

This project's goal was to build a low energy pulse to disrupt electronics from meters away. A high voltage pulser and antenna were designed and built to accomplish this goal.