Publications related to Nonreciprocal Gain in Non-Hermitian Time-Floquet Systems

Scattering from Time-Modulated Transmission-Line Loads: Theory and Experiments in Acoustics

Romain Christophe Rémy Fleury, Matthieu Francis Malléjac

Scattering wave systems that are periodically modulated in time offer many new degrees of freedom to control waves in both the spatial and frequency domains. Such systems, albeit linear, do not conserve frequency and require the adaptation of the usual the ...

2023

Time-Varying Components for Enhancing Wireless Transfer of Power and Information

Romain Christophe Rémy Fleury, Mohammad Sajjad Mirmoosa, Xuchen Wang

Temporal modulation of components of electromagnetic systems provides an exceptional opportunity to engineer the response of those systems in a desired fashion, both in the time and frequency domains. For engineering time-modulated systems, one needs to th ...

2021

Unconventional time-bandwidth performance of resonant cavities with nonreciprocal coupling

Camille Sophie Brès, Davide Grassani, Ivan Cardea, Kosmas Tsakmakidis

The time-bandwidth limit is a mathematical tenet that affects all reciprocal resonators, stating that the product of the spectral bandwidth that can couple into a resonant system and its characteristic energy decay time is always equal to 1. Here, we devel ...

2021

Temporal Modulation of Bianisotropic Metasurfaces for Unidirectional Wave Amplification

Mohammad Sajjad Mirmoosa, Xiao Wang

Nonreciprocity in time-modulated metasurfaces is normally achieved only when it is combined with with space modulation, using at least two time-varying elements located at different positions in space. In this talk, we present the idea of time-modulated bi ...

IEEE2020

Active Phase-Conjugating Rotman Lens With Reflection Amplifiers for Backscattering Enhancement

Pouyan Keshavarzian

Active retrodirective antenna arrays find a variety of use in applications involving wireless communication and sensing systems. This article presents a novel active version of the phase-conjugating Rotman lens with negative conductance amplifiers for appl ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

Coss Loss Tangent of Field-Effect Transistors: Generalizing High-Frequency Soft-Switching Losses

Elison de Nazareth Matioli, Armin Jafari, Luca Nela, Palliyage Srilak Nirmana Perera

The dissipated energy (Ediss) related to the resonant charging/discharging of a transistor output capacitance, becomes a dominant loss factor for power converters operating in the MHz range. A recent work has introduced a small-signal measurement method to ...

2020

Aperture-Coupled Low-Profile Wideband Patch Antennas for CubeSat

Anja Skrivervik, Miroslav Veljovic

This communication presents the design and measurement results of aperture-coupled stripline-fed wideband patch antennas for nanosatellite applications. The low-profile requirements lead to a strong back radiation from the coupling aperture. Instead of sup ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2019

The JET upgraded toroidal Alfven Eigenmode Diagnostic System

Ambrogio Fasoli, Duccio Testa, Patrick Blanchard

The Alfven Eigenmode Active Diagnostic system (AEAD) has undergone a major upgrade and redesign to provide a state-of-the-art excitation and real-time detection system for JET. The new system consists of individual 4 kW amplifiers allowing for increased cu ...

2019

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Nonreciprocal Gain in Non-Hermitian Time-Floquet Systems

Biomaterial devices on Arecanut palm leaf for microwave applications

Scattering from Time-Modulated Transmission-Line Loads: Theory and Experiments in Acoustics

Time-Varying Components for Enhancing Wireless Transfer of Power and Information

Unconventional time-bandwidth performance of resonant cavities with nonreciprocal coupling

Temporal Modulation of Bianisotropic Metasurfaces for Unidirectional Wave Amplification

Active Phase-Conjugating Rotman Lens With Reflection Amplifiers for Backscattering Enhancement

Coss Loss Tangent of Field-Effect Transistors: Generalizing High-Frequency Soft-Switching Losses

Multimode microwave circuit optomechanics as a platform to study coupled quantum harmonic oscillators

Aperture-Coupled Low-Profile Wideband Patch Antennas for CubeSat

The JET upgraded toroidal Alfven Eigenmode Diagnostic System

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Multimode microwave circuit optomechanics as a platform to study coupled quantum harmonic oscillators

Coss Loss Tangent of Field-Effect Transistors: Generalizing High-Frequency Soft-Switching Losses

Unconventional time-bandwidth performance of resonant cavities with nonreciprocal coupling

Scattering from Time-Modulated Transmission-Line Loads: Theory and Experiments in Acoustics

Temporal Modulation of Bianisotropic Metasurfaces for Unidirectional Wave Amplification

Active Phase-Conjugating Rotman Lens With Reflection Amplifiers for Backscattering Enhancement

Aperture-Coupled Low-Profile Wideband Patch Antennas for CubeSat

The JET upgraded toroidal Alfven Eigenmode Diagnostic System