This chapter introduces control schemes based on the PT-symmetric wireless power transfer (WPT) system. It begins with an overview of PT symmetry and its relevance to WPT, followed by detailed models and analyses based on circuit theory and coupled-mode theory. The chapter explores the output characteristics of PT-symmetric systems and presents control methods for optimizing output power through load identification. Experimental results are provided to validate the proposed control schemes, demonstrating their effectiveness in managing power transfer and enhancing system performance. The chapter highlights the innovative aspects of PT-symmetric WPT and its potential applications.

This chapter explores the application of wireless in-flight charging specifically for unmanned aerial vehicles (UAVs). It begins by outlining the benefits of this technology, including increased operational time and reduced maintenance needs. The chapter identifies key challenges such as managing continuous mutual inductance disturbances, developing lightweight pickup units, and enabling fast charging. Solutions to these challenges are discussed in detail, including innovations in system design. The chapter concludes with an overview of the construction and integration of wireless in-flight charging systems for UAVs, summarizing the current state of technology and future prospects.

Focusing on the design of magnetic couplers for UAV wireless charging, this chapter addresses various design strategies for optimizing power transfer efficiency. It covers the design of pickup coils, including embedded lightweight squirrel-cage coils, hollow pickup coils suitable for in-flight UAVs, and onboard integration-based coils. The chapter also examines different magnetic coupling structures, such as orthogonal magnetic couplers, free-rotation asymmetric couplers, and compact omnidirectional magnetic structures. Each design approach is evaluated for its effectiveness in improving wireless power transfer in UAV applications, providing insights into practical implementation and performance optimization.

This chapter addresses techniques for extending the charging range of PT-symmetric WPT systems. It begins with an introduction to range extension methods and then explores the use of S/SLDC high-order topologies for improved performance. The chapter includes system analysis, modelling, and comparison with other topologies, focusing on negative resistance design to enhance range. Additionally, it presents flexible charging range extension methods, such as autonomous on-off keying modulation schemes, and discusses their system output characteristics and control algorithm implementation. Experimental verification supports the proposed methods, showcasing advancements in expanding the operational range of PT-symmetric WPT systems.

This chapter details advanced control strategies for wireless charging systems used in UAVs. It begins with an introduction to control challenges specific to wireless charging and then discusses model-predicted control approaches, particularly those using high-order LCC-P topologies. Key topics include system modelling, mutual inductance prediction, and controller design, supported by both simulation and experimental verification. The chapter also covers rotating-coordinate-based mutual inductance estimation, including system modelling in the dq synchronous reference frame and the αβ-to-dq transformation. This section emphasizes the importance of accurate control for efficient and reliable wireless power transfer.

This chapter introduces the principles and mechanisms behind wireless power transfer (WPT), focusing on inductive power transfer systems. It begins with the historical development of WPT and then delves into the fundamental aspects of inductive power transfer, including general configurations. The chapter provides a detailed examination of theoretical models, such as the loosely coupled transformer model, T-model, and M-model, and compares their effectiveness. It further explores compensation networks, including series and parallel types, and discusses transmission performance metrics such as output power, transfer efficiency, and their interrelationships. This comprehensive overview establishes the foundational knowledge necessary for understanding advanced WPT systems.

Chapter 5 discusses the implementation of ISO 18000-63 downlink and uplink communication chains and offers practical code developed in MATLAB for evaluating the signal processing of the full RFID communication chain. The code provided is suitable for custom projects.

Chapter 4 presents a review of the ISO 18000-63 protocol, including data encoding and modulation, and aspects of the transponder memory structure, security, and privacy, and presents real examples of reader–transponder transactions.

Chapter 8 presents a comprehensive discussion of self-jamming in passive-backscatter systems by covering various self-jamming suppression approaches, including some used in commercial integrated circuit RFID reader devices.

Chapter 7 reports on an SDR-based RFID reader design including hardware and software implementations and demonstrates ISO 18000-63-compliant operation in conventional continuous-wave mode and in a novel multicarrier mode.

Chapter 10 evaluates the application of multicarrier waveforms to improve the efficiency of wireless power transfer systems, and proposes efficient power transmitter architectures, including one based on a mode-locked active antenna array.