This work systematically investigates the use of high-quality (high-Q) resonators as coding particles of chipless cooperative radar targets to overcome clutter. Due to their high-Q, the backscattered signature can outlast clutter and permit reliable readouts in dynamic environments as well as its integration in other types of cooperative radar targets for joint identification, sensing, and ranging capabilities.
This is first demonstrated with temperature and pressure sensors in the microwave frequency range, which include the characterization of a novel temperature sensor for machine tool monitoring up to 400 °C, as well as inside the machine. Afterwards, the thesis proposes and demonstrates the use of metallic as well as dielectric Electromagnetic BandGap (EBG) structures to enable the realization and to enhance the capabilities at mm-Wave and THz frequencies compared to microwave frequencies with compact monolithic multi-resonator cooperative radar targets. Furthermore, this work studies the integration of resonators as coding particles inside larger retroreflective configurations such as Luneburg lenses to achieve long-range and high accuracy for localization and, at the same time, frequency coding robust against clutter for identification. Finally, the successful readout of these cooperative radar targets is demonstrated in cluttered dynamic environments, as well as with readers based on Frequency-Modulated Continuous-Wave (FMCW) radars.
Author(s): Alejandro Jiménez-Sáez
Series: Springer Theses
Publisher: Springer
Year: 2022
Language: English
Pages: 155
City: Cham
1
Supervisor’s Foreword
Abstract
Acknowledgments
Contents
Acronyms
978-3-031-04976-7_1
1 Introduction
1.1 Motivation
1.2 Why High-mm-Wave and THz Tags?
1.3 Thesis Overview
References
978-3-031-04976-7_2
2 High-Q Resonators for Chipless RFID and Sensing
2.1 Passive Backscattering
2.1.1 RCS of Conventional Targets
2.1.2 Maximum Range
2.2 High-Q Resonators
2.2.1 Estimating Material Losses
2.2.2 RCS of a Resonating Tag
2.3 Clutter Suppression Methods
2.3.1 Harmonic Generation
2.3.2 Out-of-Band Channel Equalization
2.3.3 Time-Gating
2.4 Identification and Sensing with High-Q Resonators
2.4.1 Identification and Sensing
2.4.2 Hybrid Modulation, Ranging Accuracy, and Sensing Accuracy
References
978-3-031-04976-7_3
3 Wireless Sensing with Single Air-Cladded High-Q Resonators at Microwaves
3.1 Sensing with a Single Air-Cladded High-Q Resonator
3.1.1 Temperature Sensor for Machine Tools
3.1.2 Sensing Other Physical Parameters Through Controlled Near-Field Variations
3.2 Hybrid Modulation Enabled by a High-Q Resonator
3.2.1 Hybrid Modulation Scheme Based on a High-Q Resonator and Phase-Coded TDR
3.2.2 Implementation in Ultrawideband
3.3 Limitations and Performance Deterioration Due to Lossy Materials and Packaging
References
978-3-031-04976-7_4
4 Electromagnetic Band Gap (EBG) High-Q Resonator Concepts at mm-Waves
4.1 High-Q Resonators in a Metallic Bed of Nails (BoN)
4.1.1 Single Resonator Design
4.1.2 Multi-resonator Tags
4.1.3 Discussion
4.2 High-Q Resonators in a Full-Dielectric Photonic Crystal (PhC)
4.2.1 Single Resonator Design
4.2.2 Multi-resonator Tags
4.2.3 Discussion
4.3 Potential and Limitations of EBG-Based High-Q Resonators
References
978-3-031-04976-7_5
5 High-RCS Wide-Angle Retroreflective Tags Towards THz
5.1 Corner Reflector and Resonator Array Integration
5.1.1 Q-Factor and RCS of Resonator Arrays
5.1.2 Coding with a Frequency Selective Surface (FSS)
5.2 Lüneburg Lens with Integrated High-Q Coding Particles
5.2.1 80GHz Lüneburg Lens Tag
5.2.2 240GHz HR-Si Lüneburg Lens Tag
5.2.3 Fused Silica Ball Lens with FSS
5.2.4 Discussion
5.3 Tag Identification and Ranging with a FMCW Radar at 80 and 240GHz
5.4 Tag Identification and Ranging in Cluttered Environments at 80GHz
References
978-3-031-04976-7_6
6 Conclusion and Outlook
1 (1)
Appendix A Tag Dimensions
Appendix B Measured Unloaded Q-Factors of Metal Cavities
Appendix Curriculum Vitae
