Localization of people and objects based on multi-standard IoT for event management in meetings, incentive travel, conventions, exhibitions (MICE) industry

Name: Jawad Ali.

keyword: UHF-RFID.

LCSH: Internet of things.

; Angle of Arrival Estimation.

LCSH: Radio frequency identification systems.

LCSH: Antenna radiation patterns.

Abstract: The thesis describes the outcomes of the diverse-beam UHF antenna design structures for RFID tags. The designs are intended to integrate for indoor tracking and orientation sensing of moving targets; therefore, a contactless, low-cost, and battery-less smart solution is the paramount for localization. To serve the purpose, two linearly polarized tag antenna structures namely monopulse-based tag and dual-chip tog are simulated and optimized to operate at 915 MHz for the acquired electrical length of 0.72 and 0.39 respectively. Each tag antenna structure consists of two dipoles with different configuration. For monopulse-based tag, two dipoles (one operating at a higher order mode) are integrated on the opposing sides of the same substrate to maintain the compactness and good isolation. The higher mode dipole for monopulse-based tag is miniaturized to 51.7 % with the meander line at dipole edges. For dual-chip tag, two dipole structures are mirrored and the middle reflector is placed between them to distinguish the beam-patterns pointing in opposite directions. The dual-chip tag is then placed on a square reflecting surface with the variable spacing (between the tag and back-reflector) to mechanically control the beam elevation to offer beam-diversity. The complex impedance for the both tags is measured to validate the conjugate impedance for the NXP UCODE G2iL passive RFID chip (i.e. 23+j*224 Ω). The radiation pattern for dual-chip RFID tag antenna shows a good agreement between simulation and measurement with impedance 23+j*204 Ω. The real-time localization experiment is performed to record the RSSI for a dual-chip tag antenna. A sinusoidal regression is then used to fit the curve based on RSSI ratio. The Angle-of-Arrival (AoA) algorithm is developed to estimate the localization error. The initial AoA error acquired is 6.6 degree for the entire reading range of 4.2 m. The reading range is later extended to 38 m by developing a mathematical model based on the role of ceiling height. A diverse-beam solution is also suggested for both reader antenna and tag to extend the range. The study further suggested that a field-of-view (FOV) can be extended up to 172 degree with a diverse-beam single reader antenna installed on the ceiling of the indoor environment. Thus, providing a simple and cost-effective solution for enhanced localization for variable ceiling heights in indoor environment. The proposed outcome is not limited to be implemented using RFID technology instead, it can be applied using any indoor localization technology.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Name: Suramate Chalermwisutkul

Role: dissert advisor.

Email : suramate.c@tggs.kmutnb.ac.th

Name: Narbudowicz, Adam

Role: dissert advisor.

Name: Kamol Kaemarungsi

Role: dissert advisor.

Created: 2024

Modified: 2568-08-28

Issued: 2025-08-28

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Doctor of Engineering

Level: Doctoral Degree

Descipline: Electrical and Software Systems Engineering (International Program)

Grantor: King Mongkut's University of Technology North Bangkok

©copyrights King Mongkut's University of Technology North Bangkok

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