Area of Operation for a Radio-Frequency Identification (RFID) Tag in the Far-Field

Greene, Charles Edward (2006) Area of Operation for a Radio-Frequency Identification (RFID) Tag in the Far-Field. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

In Radio Frequency Identification (RFID) applications, it is beneficial to know where in a three-dimensional space an RFID tag will operate with respect to the interrogating transmitter. It becomes a very complex problem containing numerous variables including transmitted power, antenna gains, orientation, etc. One well-known equation used to approximate the power that a tag can receive from an interrogating transmitter is the Friis Equation. However, the commonly used form of the Friis Equation contains assumptions that limit the validity to a single point, orientation, and polarization in space, which is usually the most favorable. These simplifications eliminate the reflection coefficients and polarization terms, and the gains lose their angular dependences. This dissertation will provide a mathematical model that describes the operation of a tag in the far-field from a more realistic perspective in a three-dimensional space. The complete form of the Friis equation will be used as the basic formulation to model the amount of power a tag can receive for any orientation at a given point in space. The dissertation will also include mathematical analyses of how the location of the data base station affects the performance of the system by applying the physics embodied in the complete Friis equation to the return transmission link from the tag to the data base station. The complete mathematical expression will be used to evaluate the performance of an RFID tag by depicting the three-dimensional area of operation. The functioning volume will be solved using the developed scaling factor method and will give an accurate portrayal of where a tag can be successfully read as a specified percentage of reads when all orientations and polarizations are examined.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
Greene, Charles Edwardcegst15@pitt.eduCEGST15
ETD Committee:
Committee ChairMickle, Marlin H.mickle@engr.pitt.eduMICKLE
Committee MemberBoston, J.R.boston@engr.pitt.eduBBN
Committee MemberCain, James T.cain@engr.pitt.eduJTC
Committee MemberLovell, Michaelmlovell@engr.pitt.edu
Committee MemberHoelzeman, Ronaldhoelzema@engr.pitt.eduHOELZEMA
Date: 27 September 2006
Date Type: Completion
Defense Date: 13 February 2006
Approval Date: 27 September 2006
Submission Date: 28 February 2006
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Other ID: http://etd.library.pitt.edu/ETD/available/etd-02282006-074438/, etd-02282006-074438
Date Deposited: 10 Nov 2011 19:31