223 citations · 585 across the 15 of their papers we have counts for
16 papers
Active Beyond-Diagonal Reconfigurable Intelligent Surface with Hybrid Transmitting and Reflecting Mode
Fu Liu, Hongyu Li, Shanpu Shen
Beyond-diagonal reconfigurable intelligent surfaces (BD-RISs), originally in the passive form, have attracted attention due to their benefits in enhanced wave manipulating through…
Subwavelength Focusing by Engineered Power Flow-Conformal Metamirrors
Hamidreza Taghvaee, Fu Liu, Ana Díaz-Rubio +1
Many advances in reflective metasurfaces have been made during the last few years, implementing efficient manipulations of wavefronts, especially for plane waves. Despite numerous…
Time-varying components for enhancing wireless transfer of power and information
Prasad Jayathurathnage, Fu Liu, Mohammad S. Mirmoosa +3
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 an…
A multi-functional reconfigurable metasurface: Electromagnetic design accounting for fabrication aspects
Alexandros Pitilakis, Odysseas Tsilipakos, Fu Liu +12
In this paper we present the theoretical considerations and the design evolution of a proof-of-concept reconfigurable metasurface, primarily used as a tunable microwave absorber, b…
Active Metasurfaces as a Platform for Capacitive Wireless Power Transfer Supporting Multiple Receivers
Fu Liu, Prasad Jayathurathnage, Sergei A. Tretyakov
As wireless power transfer (WPT) repeaters, metasurfaces can enhance field coupling, improving the WPT operation. In this paper, we show that metasurfaces can also be used as trans…
Omnidirectional Wireless Power Transfer with Automatic Power Flow Control
Prasad Jayathurathnage, Xiaojie Dang, Fu Liu +2
We present an omnidirectional wireless power transfer (WPT) system capable of automatic power flow control using three orthogonal transmitter (Tx)-repeater (Rp) pairs. The power dr…
The Software-Defined Metasurfaces Concept and Electromagnetic Aspects
Anna C. Tasolamprou, Alexandros Pitilakis, Odysseas Tsilipakos +17
We present the concept and electromagnetic aspects of HyperSurFaces (HSFs), artificial, ultrathin structures with software controlled electromagnetic properties. The HSFs key unit…
Exploration of Intercell Wireless Millimeter-Wave Communication in the Landscape of Intelligent Metasurfaces
Anna C. Tasolamprou, Alexandros Pitilakis, Sergi Abadal +19
Software-defined metasurfaces are electromagnetically ultra-thin, artificial components that can provide engineered and externally controllable functionalities. The control over th…
Self-Oscillating Capacitive Wireless Power Transfer with Robust Operation
Fu Liu, Bhakti Chowkwale, Sergei A. Tretyakov
We show that a capacitive wireless power transfer device can be designed as a self-oscillating circuit using operational amplifiers. As the load and the capacitive wireless channel…
Electromagnetic Aspects of Practical Approaches to Realization of Intelligent Metasurfaces
Fu Liu, Odysseas Tsilipakos, Xuchen Wang +9
We thoroughly investigate the electromagnetic response of intelligent functional metasurfaces. We study two distinct designs operating at different frequency regimes, namely, a swi…
Software-Defined Metasurface Paradigm: Concept, Challenges, Prospects
Alexandros Pitilakis, Anna C. Tasolamprou, Christos Liaskos +13
HyperSurfaces (HSFs) are devices whose electromagnetic (EM) behavior is software-driven, i.e., it can be defined programmatically. The key components of this emerging technology ar…
Intelligent Metasurfaces with Continuously Tunable Local Surface Impedance for Multiple Reconfigurable Functions
Fu Liu, Odysseas Tsilipakos, Alexandros Pitilakis +7
Electromagnetic metasurfaces can be characterized as intelligent if they are able to perform multiple tunable functions, with the desired response being controlled by a computer in…
Pulsed Self-Oscillating Nonlinear Systems for Robust Wireless Power Transfer
Fu Liu, Bhakti Chowkwale, Prasad Jayathurathnage +1
While wired-power-transfer devices ensure robust power delivery even if the receiver position or load impedance changes, achieving the robustness of wireless power transfer (WPT) i…
Intercell Wireless Communication in Software-defined Metasurfaces
Anna C. Tasolamprou, Mohammad Sajjad Mirmoosa, Odysseas Tsilipakos +11
Tunable metasurfaces are ultra-thin, artificial electromagnetic components that provide engineered and externally adjustable functionalities. The programmable metasurface, the Hype…
Programmable Metasurfaces: State of the Art and Prospects
Fu Liu, Alexandros Pitilakis, Mohammad Sajjad Mirmoosa +12
Metasurfaces, ultrathin and planar electromagnetic devices with sub-wavelength unit cells, have recently attracted enormous attention for their powerful control over electromagneti…
On-Site Wireless Power Generation
Y. Ra'di, B. Chowkwale, C. A. Valagiannopoulos +4
Conventional wireless power transfer systems consist of a microwave power generator and a microwave power receiver separated by some distance. To realize efficient power transfer,…