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PIER PIER B PIER C PIER M PIER Letters
2008-02-05
Chip Impedance Matching for UHF RFID Tag Antenna Design
By
Chye-Hwa Loo,

    Dr. Chye-Hwa Loo

    Department of Electrical Engineering

    University of Mississippi

    USA

    Homepage

Khaled Elmahgoub,

    Dr. Khaled Elmahgoub

    Department of Electrical Engineering

    University of Mississippi

    USA

    Homepage

Fan Yang,

    Dr. Fan Yang

    Department of Electrical Engineering

    The University of Mississippi

    USA

    Homepage

Atef Elsherbeni,

    Professor Atef Elsherbeni

    Electrical Engineering Department

    University of Mississippi

    USA

    Homepage

Darko Kajfez,

    Dr. Darko Kajfez

    Department of Electrical Engineering and Center for Applied Electromagnetic Systems Research (CAESR)

    University of Mississippi

    USA

    Homepage

Ahmed Kishk,

    Professor Ahmed Kishk

    Department of Electrical Engineering

    University of Mississippi

    USA

    Homepage

Tamer Elsherbeni,

    Dr. Tamer Elsherbeni

    Department of Electrical Engineering

    University of Mississippi

    USA

    Homepage

Leena Ukkonen,

    Dr. Leena Ukkonen

    Inst Elect, Rauma Res Unit

    Tampere Univ Technol

    Finland

    Homepage

Lauri Sydanheimo,

    Dr. Lauri Sydanheimo

    Department of Electronics

    Tampere University of Technology

    Finland

    Homepage

Markku Kivikoski,

    Dr. Markku Kivikoski

    Inst Elect, Rauma Res Unit

    Tampere Univ Technol

    Finland

    Homepage

Sari Merilampi,

    Dr. Sari Merilampi

    Technology and Maritime Mngmt

    Satakunta University of Applied Sciences

    Finland

    Homepage

Pekka Ruuskanen

    Dr. Pekka Ruuskanen

    Inst Elect, Rauma Res Unit

    Tampere Univ Technol

    Finland

    Homepage

Progress In Electromagnetics Research, Vol. 81, 359-370, 2008
doi:10.2528/PIER08011804
Abstract
Passive UHF RFID tag consists of a microchip attached directly to an antenna. Proper impedance match between the antenna and the chip is crucial in RFID tag design. It directly influences RFID system performance characteristics such as the range of a tag. It is known that an RFID microchip is a nonlinear load whose complex impedance in each state varies with the frequency and the input power. This paper illustrates a proper calculation of the tag power reflection coefficient for maximum power transfer by taking into account of the changing chip impedance versus frequency.
Citation
Chye-Hwa Loo, Khaled Elmahgoub, Fan Yang, Atef Elsherbeni, Darko Kajfez, Ahmed Kishk, Tamer Elsherbeni, Leena Ukkonen, Lauri Sydanheimo, Markku Kivikoski, Sari Merilampi, and Pekka Ruuskanen, "Chip Impedance Matching for UHF RFID Tag Antenna Design," Progress In Electromagnetics Research, Vol. 81, 359-370, 2008.
doi:10.2528/PIER08011804
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