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    Staggered pattern energy harvesting and retro-directive backscatter communications for passive RFID tags and sensors

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    MARSHALL-DISSERTATION-2018.pdf (23.79Mb)
    Date
    2018-01-03
    Author
    Marshall, Blake Ryan
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    Abstract
    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.
    URI
    http://hdl.handle.net/1853/59826
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    • Georgia Tech Theses and Dissertations [22401]
    • School of Electrical and Computer Engineering Theses and Dissertations [3128]

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