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Journal Article on the Reader Used in RFTsat

Posted on August 29, 2019 Written by Gregory Durgin

Low-Power and Compact Frequency Hopping RFID Reader at 5.8 GHz for Sensing Applications in Space
Cheng Qi ; Robert W. Corless ; Joshua D. Griffin ; Gregory D. Durgin
IEEE Journal of Radio Frequency Identification
Year: 2019 | Volume: 3, Issue: 3

Radio frequency identification (RFID) is the driving technology behind many compelling applications, such as Internet-of-Things, smart cities, and inventory tracking. However, it is always challenging to make a small, low-cost transceiver with little power consumption. This paper presents the design and characterization of a low-power, compact frequency hopping RFID reader that has great potential for use in space-based sensing applications including structural health monitoring, tracking inventory, and sensitive field measurements. This RFID reader will be launched into low-earth orbit aboard the radio frequency tag satellite (RFTSat), a nanosatellite developed at Northwest Nazarene University, and serves as a demonstration of backscatter communications in space. This reader is capable of operating in the 5725–5850 MHz frequency industrial scientific medical band with up to 31 dBm equivalent isotropically radiated power (EIRP) and −58 dBm to −82 dBm sensitivity in different conditions.

Filed Under: Backscatter Radio, Publication, Wireless Power

Backer’s MS Thesis Available Online

Posted on August 13, 2019 Written by Gregory Durgin

Holographic Transmit Reflect-Array at 5.8 GHz for Wireless Power Transfer in the Fresnel Zone

MS Thesis by Emily Backer

This thesis presents the design and simulation of four square holographic reflectarrays consisting of circular patches for wireless power transfer (WPT) in the Fresnel region. The design includes the calculation of the phase reflection response from different variations of patches and substrate sizes, the calculation of the phase front needed to form a focal point, the simulation of a reference wave, the design of the hologram, and the simulation of the final holographic system. The first set of arrays use FR4 substrate and are made up of 4096, 2304, and 576 number of patch segments arranged in a rectilinear grid, and the last array uses a Rogers substrate and is made up of 4096 patches. These 1.216-meter FR4, 0.912-meter FR4, 0.456-meter FR4, and 1.216-meter Rogers holographic reflectarrays successfully collimate the incoming power into beams at 10-meter, 5-meter, 3-meter, and 10-meter focal points respectively.

Filed Under: Publication, Wireless Power

Using the Tongue to Control Your Surroundings

Posted on July 8, 2019 Written by Gregory Durgin


A Standalone Intraoral Tongue-Controlled Computer Interface for People with Tetraplegia
Fanpeng Kong; M.N. Sahadat; Maysam Ghovanloo; Gregory D. Durgin
IEEE Transactions on Biomedical Circuits and Systems
Year: 2019

Fanning Kong has a new article documenting the tongue-controlled computer interface for wheel-chair bound users in the IEEE Transactions on Biomedical Circuits and Systems.  The article is available for download on IEEExplore.

Filed Under: Publication

Microwave Reader Design for RFSat

Posted on July 5, 2019 Written by Gregory Durgin


Low-power and Compact Frequency Hopping RFID Reader at 5.8 GHz for Sensing Applications in Space
Cheng Qi; Robert W. Corless; Joshua D. Griffin; Gregory D. Durgin
IEEE Journal of Radio Frequency Identification
Year: 2019

This invited journal paper discusses the low-powered, custom microwave reader developed for the RFSat mission in conjunction with Northwest Nazarene University.  The article is available on IEEExplore.

Filed Under: Backscatter Radio, Publication, Wireless Power

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Conference Watch

IEEE RFID 2021 (hybrid)
27-29 April 2021, Phoenix, AZ
Submission Deadline:  2 February 2021

IEEE IMS 2021 (hybrid)
6-11 June 2021, Atlanta, GA
Submission Deadline: 15 Dec 2021

IEEE ICC 2021
14-18 June 2021, Montreal, Canada
Submission Deadline:  20 Jan 2021

IEEE APS 2021
10-16 July 2021, Singapore
Submission Deadline:  15 Jan 2021

IEEE RFID-TA 2021
September 2021, Aveiro, Portugal
Submission Deadline:  June 2021

IEEE WiSEE 2021
10-12 October 2021, Cleveland, OH
Submission Deadline:  1 July 2021

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