Congratulations to Cheng Qi for his paper, “Low-power and Compact Microwave RFID Reader for Sensing Applications in Space”, which has been awarded the best student paper at the IEEE RFID-TA 2018 conference in Macau, SER China. This work documents Cheng’s work on the RFsat mission with Northwest Nazarene University, which is taking a custom-built GTPG microwave backscatter reader and energy-harvesting tag into space as part of a novel science package. His co-authors are Prof. Josh Griffin (GTPG alum) and Prof. Durgin. Well done, Cheng!
WWB08: H-field Modeling around Loops and Coils
In this installment of the Wireless Without Batteries Lectures, we discuss magnetic field modeling around loops and coils. This is the background of near-field charging circuits.
WWB08: H-field Modeling around Loops and Coils
Paper: S.Y. Hui, “Planar Wireless Charging Technology for Portable Electronic Products and Qi,” Proceedings of the IEEE, vol 101, no 6, June 2013.
Reading: MSF02, 04, 06 Youtube Videos
WWB07: RF Thermoelectric Conversion
In this lecture from the Wireless Without Batteries series, we discuss a hypothetical device that converts RF energy to heat, and then to DC power. Not only does this nanoscale device outperform conventional Silicon CMOS diode rectification at the nanoscale, but the analysis illustrates the fundamental thermodynamic limits of RF energy-harvesting.
WWB07: RF Thermoelectric Conversion
Paper: G.D. Durgin. “RF Thermoelectric Generation for Passive RFID,” IEEE RFID 2016, Orlando, FL. 5 May 2016. 8 pages.
Marshall’s PhD Dissertation on Energy-Harvesting Arrays Now on SmartTech
This work introduces an optimal backscatter and energy harvesting solution for radio frequency identification (RFID) by using N antennas with N ports called a staggered patterned and retro-directive (SPAR) tag. By using multiple ports and a unitary scattering matrix on the SPAR tag, the structure is able to create multiple orthogonal radiation patterns to improve range of passive RFID tags. This is demonstrated on a 5.8 GHz RFID tag using a two-element patch antenna array fed by a 90˚ hybrid. In addition to canonical designs, new SPAR structures are hypothesized with optimized size, bandwidth, etc. A co-simulator is developed capable of searching a vast space of possible feed networks with N-by-N ports that meet the requirements of a unitary scattering matrix. A new structure that meets the 2-by-2 SPAR scattering matrix requirements is presented to demonstrate the capabilities of the software. The software can also be generalized to discover new physical structures of larger N−by−N SPAR tags or other microwave devices.
PhD: Staggered Pattern Energy Harvesting and Retro-directive Backscatter Communications for Passive RFID Tags and Sensors
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