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IEEE Wireless Communications Letters, ISSN 2162-2337, 11/2019, pp. 1 - 1
In cell-free (CF) massive MIMO, a large number of access points (APs) distributed over the coverage area jointly serve a set of users over the same... 
Array signal processing | channel reciprocity | Channel estimation | conjugate beamforming | maximum-ratio processing | Downlink | frequency response mismatch | Frequency response | Uplink | channel hardening | Signal to noise ratio | Cell-free massive MIMO
Journal Article
Nature Photonics, ISSN 1749-4885, 12/2017, Volume 11, Issue 12, pp. 774 - 783
Reciprocity is a fundamental principle in optics, requiring that the response of a transmission channel is symmetric when source and observation points are... 
OPTICAL ISOLATION | PHASE | PHYSICS, APPLIED | FERRITE | FREE NON-RECIPROCITY | ISOLATORS | OPTICS | Reciprocity | Modulation | Switches | Optical communication | Optics | Magnetic materials | Devices | Modulators | Optical data processing | Photonics | Symmetry
Journal Article
IEEE Journal of Solid-State Circuits, ISSN 0018-9200, 08/2018, Volume 53, Issue 8, pp. 2190 - 2201
Journal Article
Physical Review Letters, ISSN 0031-9007, 02/2018, Volume 120, Issue 8, p. 087401
We explore the unconventional wave scattering properties of non-Hermitian systems in which amplification or damping are induced by time-periodic modulation.... 
FIBER | SYMMETRY | PHYSICS, MULTIDISCIPLINARY | FREQUENCY | STIMULATED BRILLOUIN-SCATTERING | MICROCAVITIES | FREE NON-RECIPROCITY | DIODE | OPTICAL ISOLATOR | RESONATOR
Journal Article
Reports on Progress in Physics, ISSN 0034-4885, 02/2017, Volume 80, Issue 3, p. 036401
The field of metamaterials has opened landscapes of possibilities in basic science, and a paradigm shift in the way we think about and design emergent material... 
plasmonics | metamaterials | metasurfaces | PHYSICS, MULTIDISCIPLINARY | WAVE-FRONT | LIGHT-SCATTERING | FREE NON-RECIPROCITY | TRANSFORMATION OPTICS | PARITY-TIME SYMMETRY | FANO RESONANCES | PHYSICAL BOUNDS | EXCEPTIONAL POINTS | PANCHARATNAM-BERRY PHASE | ELECTROMAGNETIC-WAVES
Journal Article
IEEE Journal of Solid-State Circuits, ISSN 0018-9200, 05/2017, Volume 52, Issue 5, pp. 1358 - 1372
Recently, we demonstrated the first CMOS nonmagnetic nonreciprocal passive circulator based on N-path filters that uses time variance to break reciprocity.... 
Wireless communication | nonreciprocity | CMOS | Circulators | Linearity | Distortion | full-duplex (FD) wireless | Circulator | interference cancellation | Tuning | FILTERS | NOISE | FREE NON-RECIPROCITY | CANCELLATION | ENGINEERING, ELECTRICAL & ELECTRONIC | Design parameters | Reciprocity | Receivers & amplifiers | Intermodulation | Performance measurement
Journal Article
Scientific Reports, ISSN 2045-2322, 12/2019, Volume 9, Issue 1, pp. 8718 - 16
Magnetic-free non-reciprocity based on linear-periodically-time-variant (LPTV) circuits has received significant research and commercial attention since it... 
MULTIDISCIPLINARY SCIENCES | FILTERS | FREE NON-RECIPROCITY | Circuits | Energy storage
Journal Article
IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, 02/2018, Volume 66, Issue 2, pp. 911 - 926
In this paper, we discuss the design rationale and guidelines to build magnet-less circulators based on spatiotemporal modulation of resonant junctions... 
Radio frequency | Varactors | nonreciprocity | Frequency modulation | Bandstop filters | spatiotemporal modulation | Circulators | magnet-less circulator | Topology | Magnetic circuits | full-duplex | FREE NON-RECIPROCITY | ENGINEERING, ELECTRICAL & ELECTRONIC | Circuit design | Computer simulation | Modulation | Angular momentum | Ports | Product design
Journal Article
PHYSICAL REVIEW X, ISSN 2160-3308, 07/2019, Volume 9, Issue 3, p. 031015
The delay-bandwidth limit implies a stringent trade-off between the time delay, bandwidth, and propagation distance of an electromagnetic signal. Here, we show... 
SLOW LIGHT | BREAKING | DESIGN | PHYSICS, MULTIDISCIPLINARY | FILTERS | FREE NON-RECIPROCITY | SPATIOTEMPORAL MODULATION | FAST LIGHT
Journal Article
IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, 06/2018, Volume 66, Issue 6, pp. 2731 - 2745
Journal Article
Journal of Physics Condensed Matter, ISSN 0953-8984, 02/2018, Volume 30, Issue 10, p. 104002
We investigate topologically-protected unidirectional leaky waves on magnetized plasmonic structures acting as homogeneous photonic topological insulators. Our... 
nonreciprocity | leaky waves | topological photonics | metamaterials | magnetized plasmas | surface plasmon polaritons | INSULATORS | PHYSICS, CONDENSED MATTER | STATES | PHOTONICS | FREE NON-RECIPROCITY
Journal Article
IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, 11/2019, Volume 67, Issue 11, pp. 4322 - 4331
A novel highly linear magnetless isolator based on weakly coupled nonreciprocal metamaterials is proposed in this article. Nonreciprocal devices, such as... 
Couplings | Isolators | Phase shifters | Magnetic domains | Magnetic resonance | Microwave theory and techniques | Lorentz reciprocity | magnetless nonreciprocal metamaterial (MNM) | Transistors | nonreciprocal devices | DEVICES | FREE NON-RECIPROCITY | BAND | ENGINEERING, ELECTRICAL & ELECTRONIC
Journal Article
IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, 07/2019, Volume 67, Issue 7, pp. 2649 - 2662
In this paper, we introduce the first integrated circuit (IC) implementation of spatiotemporally modulated angular-momentum (STM-AM)-biased magnetless... 
CMOS | Frequency modulation | Circulators | spatiotemporally modulated-angular-momentum (STM-AM) | Spatiotemporal phenomena | Topology | Circulator | magnetless | Magnetic circuits | ACTIVE QUASI-CIRCULATOR | POWER | FREE NON-RECIPROCITY | ENGINEERING, ELECTRICAL & ELECTRONIC
Journal Article
IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, 06/2019, Volume 67, Issue 6, pp. 2331 - 2345
In this paper, we demonstrate, for the first time, an isolating bandpass filter with low-loss forward transmission and high reverse isolation by modulating its... 
Bandpass filter (BPF) | nonreciprocity | Time-frequency analysis | Frequency modulation | spatiotemporal modulation (STM) | time-invariant | time-modulated | Capacitors | Resonant frequency | time-varying | isolator | Resonators | FREE NON-RECIPROCITY | SPATIOTEMPORAL MODULATION | CIRCULATORS | ENGINEERING, ELECTRICAL & ELECTRONIC
Journal Article
IEEE Transactions on Microwave Theory and Techniques, ISSN 0018-9480, 12/2018, Volume 66, Issue 12, pp. 5472 - 5481
Journal Article
Journal Article
IEEE Microwave and Wireless Components Letters, ISSN 1531-1309, 05/2018, Volume 28, Issue 5, pp. 395 - 397
This letter presents the experimental demonstration of a film bulk acoustic resonator (FBAR) circulator at 2.5 GHz. The circulator is based on spatiotemporal... 
Varactors | nonreciprocity | Frequency modulation | Circulators | Resonant frequency | film bulk acoustic resonators (FBARs) | Film bulk acoustic resonators | FREE NON-RECIPROCITY | ENGINEERING, ELECTRICAL & ELECTRONIC | Piezoelectricity | Bulk acoustic wave devices | Varactor diodes | Quality factor | Modulation | Coupling coefficients
Journal Article
Journal of Microelectromechanical Systems, ISSN 1057-7157, 06/2019, Volume 28, Issue 3, pp. 409 - 418
A circulator with three ports allows unidirectional (or non-reciprocal) power transmission and facilitates the development of in-band full duplexers for... 
Radio frequency | Linear systems | Frequency modulation | Phase modulation | Circulators | non-reciprocity | CMOS RF switches | AlN MEMS filters | in-band full duplexes (IBFD) | magnetic-free circulator | Aluminum nitride | parametric modulation | Microelectromechanical systems | CMOS | Reciprocity | Duplexers | Insertion loss | Switches | Bandwidth | Ferromagnetic materials | Switching
Journal Article
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