NJIT eTD::njit-etd2009-087::Yalcin, Nedime Pelin::"Non-foster matching of an RFID antenna"

In this thesis, novel designs of radio-frequency identification (RFID) tag antennas with better matching characteristics to achieve extended range for passive tags have been investigated in the ultra-high frequency (UHF) band. A variety of cavitybacked/coupled microstrip dipole antennas in 915 MHz range were considered. Additionally, a negative impedance converter designed to cancel out antenna's input capacitance at resonance frequency and to produce the real antenna input impedance was designed, simulated and implemented for an RFID antenna. Numerical simulations have been carried out using ORCAD software package (Cadence), ADS software package (Agilent) and HFSS software package (ANSYS/ANSOFT Inc). Antennas have been designed, fabricated and tested; and a comparison of simulated and measured results were done. Further work is recommended to tune antennas to lower the return loss at operating frequency, in order to achieve an optimized range for use with passive tags.

Title:	Non-foster matching of an RFID antenna
Author:	Yalcin, Nedime Pelin
Document Type:	Thesis
Department:	Department of Electrical and Computer Engineering
Degree:	Master of Science
Major:	Electrical Engineering
Advisory Committee:	Niver, Edip Whitman, Gerald Martin Akansu, Ali N. Carr, William N.
Thesis Date:	2009, August
Keywords:	RFID antenna Ultra-high frequency
Availability:	Unrestricted
Abstract:	In this thesis, novel designs of radio-frequency identification (RFID) tag antennas with better matching characteristics to achieve extended range for passive tags have been investigated in the ultra-high frequency (UHF) band. A variety of cavitybacked/coupled microstrip dipole antennas in 915 MHz range were considered. Additionally, a negative impedance converter designed to cancel out antenna's input capacitance at resonance frequency and to produce the real antenna input impedance was designed, simulated and implemented for an RFID antenna. Numerical simulations have been carried out using ORCAD software package (Cadence), ADS software package (Agilent) and HFSS software package (ANSYS/ANSOFT Inc). Antennas have been designed, fabricated and tested; and a comparison of simulated and measured results were done. Further work is recommended to tune antennas to lower the return loss at operating frequency, in order to achieve an optimized range for use with passive tags.
Complete Thesis:	njit-etd2009-087 (63 pages ~ 3,648 KB pdf)
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