posted Nov 3, 2016, 9:06 PM by Khaled salama
updated Dec 19, 2016, 10:26 PM
Dr Mahmoud Ouda just defended his PhD which was highly received. Mahmoud worked on wireless energy harvesting from ambient RF signals. The dissertation is unique in developing an integrated RF-DC converter with
on-chip antenna for lowering costs—in essence eliminating the cost of fabricating a different antenna. Another unique aspect of this thesis is the RF harvester’s integration with a wireless powered implantable sensor. Such sensors will become ubiquitous for medical applications, with their numbers reaching in the trillions. The need to power these sensors wirelessly eliminates batteries and makes the sensors maintenance free. Also, the achieved efficiencies of 65% at 433MHz with an input power of -15dBm is well in line with some of the
best achieved efficiencies. Further, the developed RF-to-DC power converter, operating at 5.2GHz and incorporating adaptive self-biasing, is certainly unique. Even more, the peak efficiency of 90% is quite impressive. That is, this work carried out RF-to-DC harvesting at 400MHz and at 5.2GHz. This work was conducted in collaboration with Prof. Waleed Khalil, Thh ohio state university. The details are outlined in his thesis "Wide-Range Highly-Efficient Wireless Power Receivers for Biomedical Sensors".
Prof. John Volakis, the director of Electroscience lab, The ohio state university commented that " Mahmoud has done an impressive amount of work. His focus has certainly been on the integration of RF-to-DC wireless power harvester with medical sensors. Altogether, Mr. Ouda has published 5 journal papers in well-read and followed journals. This is impressive, and demonstrates the strong contributions of this dissertation."
His work resulted in following publications:
- M. Ouda, W. Khalil and K.N. Salama, "Self-Biased Differential Rectifier with Enhanced Dynamic Range for Wireless Powering" IEEE Transactions on Circuits and Systems II: Express Briefs, 2016 (accepted)
- M. Ouda, W. Khalil and K.N. Salama, "Wide-Range Adaptive RF-to-DC Power Converter for UHF RFIDs," IEEE Microwave and Wireless Components Letters, 2016 10.1109/LMWC.2016.2586077
- M. Ouda, L. Marnat, A. Shamim, K N Salama, 5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors, IEEE Transactions on Microwave Theory and Techniques, vol 61, n 5, pp 2177-2184, 2013
- L. Marnat, M. Ouda, M. Arsalan, K. Salama, A. Shamim, "On-chip implantable antennas for wireless power and data transfer in a glaucoma monitoring SoC", IEEE Antennas and Wireless Propagation Letters (AWPL), vol 11, pp 1671-1674, 2012
- A. M. Elshurafa, A.G. Radwan, P. H. Ho, M. Ouda and K. N. Salama "Low Voltage Puzzle-Like Fractal MEMS Variable Capacitors Suppressing Pull-in" IET micro and nano letters, vol. 7, no. 9, pp. 965-969, 2012.
- M. Arsalan, M. H. Ouda, L. Marnat, A. Shamim, K. N. Salama," Implantable Intraocular Pressure Monitoring Systems: Design Considerations",Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), 2013 IEEE MTT-S International
- M. Arsalan, M. Ouda, L. Marnat, A. Shamim and K N Salama, A 5.2GHz, 0.5mW RF Powered Wireless Sensor with Dual On-Chip Antennas for Implantable Intraocular Pressure Monitoring, IEEE MTT-S International Microwave Symposium Digest (IMS), 2013