312 citations · 314 across the 17 of their papers we have counts for
18 papers
Robust Beamforming for Cell-Free Systems with Parallel-Plate-Waveguided Dynamic Metasurfaces
Konstantinos D. Katsanos, Panagiotis Gavriilidis, George C. Alexandropoulos
Dynamic Metasurface Antennas (DMAs) constitute a promising solution for extremely large antenna arrays, requiring lower power consumption and reduced hardware cost as compared to c…
A Near-Field Compatible Model for 2D Waveguide-Fed Metasurfaces
Panagiotis Gavriilidis, George C. Alexandropoulos
This paper presents a novel physically consistent analytical model for two-dimensional (2D) waveguide-fed metasurface antennas that is based on the discrete dipole approximation. T…
Near-Field Beam Focusing Characterization for 2D Waveguide-Fed Metasurface Antennas
Panagiotis Gavriilidis, George C. Alexandropoulos
Two-dimensional (2D) waveguide-fed metasurfaces enable scalable antenna apertures through guided wave excitation of distributed radiating elements. However, the resulting non-unifo…
2D Waveguide-Fed Metasurfaces: Physically Consistent Modeling, Validation, and Optimization
Panagiotis Gavriilidis, George C. Alexandropoulos
Antenna array architectures based on programmable metasurfaces are emerging as a promising solution for scalable implementations of the eXtremely Large Multiple-Input Multiple-Outp…
Sensing-Aided Near-Field Beam Tracking
Panagiotis Gavriilidis, George C. Alexandropoulos
The interplay between large antenna apertures and high carrier frequencies in future wireless systems gives rise to near-field communications, where the curvature of spherical wave…
2D Waveguide-Fed Metasurface Antenna Arrays: Modeling and Optimization for Bistatic Sensing
Ioannis Gavras, Panagiotis Gavriilidis, George C. Alexandropoulos
This paper presents a physics-consistent framework for bistatic sensing incorporating a 2-Dimensional (2D) waveguide-fed metasurface antenna array capable of realizing eXtremely-La…
MIMO Communications with 1-bit RIS: Asymptotic Analysis and Over-the-Air Channel Diagonalization
Panagiotis Gavriilidis, Kyriakos Stylianopoulos, George C. Alexandropoulos
This paper presents an asymptotic analysis of Multiple-Input Multiple-Output (MIMO) systems assisted by a 1-bit Reconfigurable Intelligent Surface (RIS) under Ricean fading conditi…
Active Reconfigurable Intelligent Surfaces: Circuit Modeling and Reflection Amplification Optimization
Panagiotis Gavriilidis, Deepak Mishra, Besma Smida +3
Reconfigurable Intelligent Surfaces (RISs) constitute a promising emerging technology that enables wireless systems to control the propagation environment to enhance diverse commun…
Graph-CNNs for RF Imaging: Learning the Electric Field Integral Equations
Kyriakos Stylianopoulos, Panagiotis Gavriilidis, Gabriele Gradoni +1
Radio-Frequency (RF) imaging concerns the digital recreation of the surfaces of scene objects based on the scattered field at distributed receivers. To solve this difficult inverse…
How Do Microstrip Losses Impact Near-Field Beam Depth in Dynamic Metasurface Antennas?
Panagiotis Gavriilidis, George C. Alexandropoulos
The convergence of eXtremely Large (XL) antenna arrays and high-frequency bands in future wireless networks will inevitably give rise to near-field communications, localization, an…
Characterization of Indoor RIS-Assisted Channels at 304 GHz: Experimental Measurements, Challenges, and Future Directions
George C. Alexandropoulos, Bo Kum Jung, Panagiotis Gavriilidis +7
Reconfigurable Intelligent Surfaces (RISs) are expected to play a pivotal role in future indoor ultra high data rate wireless communications as well as highly accurate three-dimens…
On the Detection of Non-Cooperative RISs: Scan B-Testing via Deep Support Vector Data Description
George Stamatelis, Panagiotis Gavriilidis, Aymen Fakhreddine +1
In this paper, we study the problem of promptly detecting the presence of non-cooperative activity from one or more Reconfigurable Intelligent Surfaces (RISs) with unknown characte…
Metasurface Energy Harvesters: State-of-the-Art Designs and Their Potential for Energy Sustainable Reconfigurable Intelligent Surfaces
Alireza Ghaneizadeh, Panagiotis Gavriilidis, Mojtaba Joodaki +1
Metasurface Energy Harvesters (MEHs) have emerged as a prominent enabler of highly efficient Radio Frequency (RF) energy harvesters. This survey delves into the fundamentals of the…
Asymptotically Optimal Closed-Form Phase Configuration of -bit RISs via Sign Alignment
Kyriakos Stylianopoulos, Panagiotis Gavriilidis, George C. Alexandropoulos
While Reconfigurable Intelligent Surfaces (RISs) constitute one of the most prominent enablers for the upcoming sixth Generation (6G) of wireless networks, the design of efficient…
Near-Field Beam Tracking with Extremely Large Dynamic Metasurface Antennas
Panagiotis Gavriilidis, George C. Alexandropoulos
The interplay between large antenna apertures and high frequencies in future generations of wireless networks will give rise to near-field communications. In this paper, we focus o…
Reconfigurable Intelligent Surfaces for THz: Hardware Impairments and Switching Technologies
Sérgio Matos, Yihan Ma, Qi Luo +10
The demand for unprecedented performance in the upcoming 6G wireless networks is fomenting the research on THz communications empowered by Reconfigurable Inteligent Surfaces (RISs)…
Metasurface-Based Receivers with -bit ADCs for Multi-User Uplink Communications
Panagiotis Gavriilidis, Italo Atzeni, George C. Alexandropoulos
The massive Multiple-Input Multiple-Output (mMIMO) concept has been recently moving forward to extreme scales to address the envisioned requirements of next generation networks. Ho…
Holographic MIMO Communications: Theoretical Foundations, Enabling Technologies, and Future Directions
Tierui Gong, Panagiotis Gavriilidis, Ran Ji +7
Future wireless systems are envisioned to create an endogenously holography-capable, intelligent, and programmable radio propagation environment, that will offer unprecedented capa…