The Propagation Group

Georgia Tech ECE Research Group

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WiWe Moisture Sensor Final Report

Posted on March 18, 2019 Written by Gregory Durgin

Based on work as part of the Children’s Hospital of Atlanta (CHoA) pediatric seed grants competition, a team of researchers put together this report in 2013 on the design of a battery-free moisture sensor for diapers and bed-wetting. The final design showed that diversity antennas feeding two RFID chips and a common moisture sensor could be placed on a low-cost, flexible inset and interrogated accurately in a room with a UHF RFID reader. Download the report here.

Filed Under: Backscatter Radio, EJECT!, Wireless Power

IEEE RFID 2019, Phoenix, AZ, 2-4 April 2019

Posted on March 15, 2019 Written by Gregory Durgin


IEEE RFID 2019 in Phoenix, AZ is coming up soon, with the program at a glance now available.  This premier annual international research conference on RFID will be the 13th edition in the series.  As a side note, a number of GTPG alums and senior PhD students have positions on the organizing committee this year:

Cheng Qi + Mohammad Alhassoun, poster chairs

Dr. Francesco Amato, publicity chair

Dr. Brian Degnan, TPC – Protocols and Securities track chair

Filed Under: News

First-Order Surface Roughness

Posted on March 13, 2019 Written by Gregory Durgin

This article provides a derivation of the Rayleigh criterion for surface roughness. As a once-flat surface roughens, the specular reflected wave begins to degrade in power as some of it is scattered in different directions. The result is a predictable degradation that is a function of the rough surface statistics. The end result — the Rayleigh criterion — is used throughout science and engineering to describe everything from propagation off of building sides to the specifications for a satellite dish antenna. Download the article here here.

Filed Under: EJECT!, Propagation Modeling

Tianchong Jiang’s MS Thesis Available

Posted on March 11, 2019 Written by Gregory Durgin


Tianchong “Michael” Jiang’s MS thesis entitled “Tri-band Object-Resistant Antenna Design“, is now available on SmartTech.  From the thesis:

A new tri-band monopole antenna is proposed in this thesis. The antenna is made up of two simple L-shaped structures making it easy to fabricate and low in cost. The three target ISM bands (915MHz, 2.4GHz and 5.8GHz) enable it to be used for for low-power and short range telecommunications, such as WiFi, Bluetooth, Zigbee, wireless telephones, RFID, and NFC links. The bandwidths are designed to be in excess of the allotted bands making the antenna resistant to the presence of nearby object variations. This allows the antenna design to be used across the broadest possible application space. The proposed antenna is fabricated on an 80mm * 80mm RO4730 board and achieves a bandwidth of 9.3%, 66.7% and 12.4% at 915MHz, 2.4GHz, and 5.8GHz respectively. For the antenna gain, it achieves 2.5dBi, 4dBi and 4.3dBi at 915MHz, 2.4GHz and 5.8GHz respectively.

Filed Under: Propagation Modeling

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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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