Negative Group Delay Devices: From concepts to applications introduces the theoretical concept, analysis, design methodology and implementation of negative group delay (NGD). The NGD concept is a recent topic in electrical and electronic engineering research based on an unconventional function; the generation of an output signal seemingly in time-advance of the input signal. The NGD function has been exploited to develop experimental high-performance electronic devices, and novel design features of radio frequency (RF) and microwave electronic devices, such as filters, power dividers and amplifiers. Examples include the realization of non-Foster reactive elements, shortening or reducing delay lines, enhancing the efficiency of feedforward linear amplifiers, improvement of phase shifters accuracy and bandwidth, equalization of electrical interconnect effects for the microwave, digital and mixed signal integrity improvement, and minimizing beam-squint in series-fed antenna arrays.
The aim of the book is to advance understanding of the NGD principle and its applications. Recent results and outcomes for the different methodologies used to elaborate the NGD function are shared in each chapter, and approaches relevant to various devices are described. This book will be of particular interest to researchers, academics and postdoctoral students interested in signal processing in electronic, radio frequency, microwave and optoelectronic devices, and particularly those investigating unconventional circuit and system design.
- Chapter 2: Negative group delay power dividers
- Chapter 3: Delay-induced negative group delay
- Chapter 4: Microwave transversal and recursive filter-based negative group delay circuits and non-Foster elements
- Chapter 5: Hybrid coupler-based NGD circuit
- Chapter 6: NGD-based Hilbert filter
- Chapter 7: Design technique on the microwave amplifier-based active lumped NGD devices
- Chapter 8: Limits of passive and active negative group delay distributed circuits
- Chapter 9: Superluminality and detectable information in dispersive channels
- Chapter 10: Split-ring resonator-loaded X-band waveguide supporting negative group velocity
- Chapter 11: Metamaterial-based common-mode noise filter with NGD effect for multilayer PCB
Blaise Ravelo is an Associate Professor in electronics and multiphysics engineering, and a pioneer of the development of negative group delay (NGD) circuits. He is regularly involved, initiated and led national and international R&D&I projects funded by the programs FP7, INTERREG, ANR, FUI, Horizon 2020, Euripides on electronic, microwave, and EMC engineering. He is co-author of more than 220 papers published in international journals, book chapters, and conferences.