Sanaullah (2025) Design and development of a flexible microstrip multi-resonator for wearable chipless rfid tag applications. Masters thesis, Universiti Teknikal Malaysia Melaka.
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Abstract
Chipless Radio Frequency Identification (CRFID) is gaining attention as a low-cost and flexible alternative to traditional RFID, particularly for applications in wearable electronics and smart textiles. Unlike conventional RFID, which relies on integrated circuits, CRFID utilizes passive resonators for data encoding. However, existing flexible and fabric-based CRFID implementations often suffer from low bit capacity, poor spectral efficiency, and poor-quality factor (Q-factor), limiting their practical application. This research introduces a Parallel L-shape Multi-Resonator (PLMR) design aimed at enhancing bit encoding capacity, spectral density, and overall performance. The study begins with a detailed review of microstrip resonators, textile-integrated CRFID designs, and high-Q resonator structures. A theoretical model of the PLMR-based CRFID tag is developed and refined through electromagnetic simulations using CST Microwave Studio 2022 and Advanced Design System 2023.To validate the proposed design, Prototypes were fabricated on two different types of substrates: rigid (Rogers 4003C) and flexible (AN10 Kapton). Textile-based materials such as pile, denim, felt, silk, and fleece were evaluated solely through thorough simulations. The performance of the design have been evaluated using key metrics such as coding capacity, spectral density, spatial density, and Q-factor. The fabricated prototypes have bit capacities of 15 on Rogers 4003C and 9 on AN10 Kapton. In contrast, fabric-based designs achieved a simulated bit capacity of 13 for all evaluated textile types. The design achieves high-Q value of 237.3 on Roger 4003C, 51.5 on AN10 Kapton and 278 on fleece fabric substrate. Due to high Q-value, resonator structure improves frequency selectivity, minimizes interference, and enhances detection accuracy, thereby extending the tag’s operational range. Performance validation through S-parameter analysis, frequency response measurement, and Bending analysis examination confirms its reliability for practical applications. The results demonstrate that the PLMR-based CRFID tag provides superior flexibility, increased data encoding capacity, and robust signal performance, positioning it as a viable solution for next-generation chipless RFID technologies. This work contributes to the advancement of wearable and textile-integrated RFID systems, opening new possibilities for automated tracking, identification, and sensing in smart environments.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | CRFID, UWB, OOK, Spectral density, Quality factor |
| Subjects: | T Technology T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Faculty Of Electronics And Computer Technology And Engineering |
| Depositing User: | Norhairol Khalid |
| Date Deposited: | 26 Dec 2025 08:15 |
| Last Modified: | 26 Dec 2025 08:15 |
| URI: | http://eprints.utem.edu.my/id/eprint/29352 |
| Statistic Details: | View Download Statistic |
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