Keywords and Phrases
Memristor; Passive RFID tag; RFID
"The passive RFID tag in the UHF has been employed in several different applications including, tracking, logistics, and as a sensing platform for the Internet of things (IoT). The tag is ideal for this industry due to its unique design. It harvests all of its energy from the environment, and is small, cheap, and requires little to no maintenance. However, there are two major issues limiting the potential of the passive RFID systems: the limited power harvested by the tag, and the high susceptibility to interference and coupling. In particular, dynamic environments render the traditionally fixed, RF impedance matching network ineffective.
A novel design for a flexible Impedance-Switching Network (ISN) for passive RFID tags in the UHF is presented in this thesis. This novel approach can maximize power harvested by the tag. We propose two approaches to implementing the ISN. First, a more traditional design with a series of varactors is developed and studied. Each varactor is placed in parallel impedance lanes that are controlled via a feedback loop to maximize harvested power. A four-lane ISN is designed, tested, and tuned. The simulations and experiments demonstrate that ISN is capable of compensating for negative effect of mutual coupling in a ferromagnetic-reach environment.
The second design employs a new material called a memristive switch that can replace the varactors in the ISN. State of a memristive switch is non-volatile and requires little energy to operate, thus making it ideal for passive RFID tags. We are the first to characterize the Co3O4 based memristive switch in UHF range. The results show that it can be employed as a varying capacitor in the RF front-end design. We propose three general configurations for the ISNs"--Abstract, page iii.
Zawodniok, Maciej Jan, 1975-
Switzer, Jay A., 1950-
Electrical and Computer Engineering
M.S. in Computer Engineering
National Science Foundation (U.S.)
Missouri University of Science and Technology
viii, 48 pages
© 2015 George H. Harris, All rights reserved.
Thesis - Open Access
Electronic OCLC #
Harris, George H., "MR4RF: MEM-device with impedance and their usage with impedance matching networks for passive RFID tags in the UHF" (2015). Masters Theses. 7853.