143 citations · 949 across the 36 of their papers we have counts for
41 papers
Upper Bounds on Efficiency of Pixel Antennas
Albert Salmi, Philipp del Hougne, Leo Lahti +1
This letter presents a method to compute fundamental bounds on the total efficiency of pixel antennas. Using semidefinite relaxation, we obtain an upper bound on the optimization p…
Möbius Reparametrization of Multiport-Network Models of PIN-Diode-Programmable Metasurfaces for Accurate Low-Order Neumann Approximations
Philipp del Hougne
Accurate models of programmable metasurfaces based on multiport-network theory (MNT) account for mutual coupling (MC) through a configuration-dependent matrix inversion. The latter…
Wave-Domain Semantic Equalization Using a Practical Dynamic Metasurface Antenna with Strong Mutual Coupling
Yassine Sghaier, Emilio Calvanese Strinati, Philipp del Hougne
Semantic mismatch between independently trained AI-native agents in heterogeneous networks can impair semantic communications. Hybrid analog-digital semantic equalization can align…
RIS-Aided Wireless Multiport Sensing: Multiplexed De-Embedding of an RIS-Programmable Over-the-Air Fixture
Philipp del Hougne
Wireless multiport sensing aims to remotely retrieve the scattering matrix of a multiport device under test (DUT) connected to not-directly-accessible (NDA) antennas, based on scat…
Bounds on Shaping Partially Coherent Microwaves with Programmable Scattering Systems
Philipp del Hougne
We derive bounds on manipulating partially coherent microwaves with programmable scattering systems. We first consider the concentration of power from a partially coherent input in…
Cross-Harmonic Ambiguity-Aligned Multiport Parameter Estimation for Time-Floquet RIS
Philipp del Hougne
A time-Floquet reconfigurable intelligent surface (TF-RIS) periodically modulates its elements within a signaling interval, enabling frequency conversion and additional degrees of…
Electromagnetic Bounds on Realizing Targeted MIMO Transfer Functions in Real-World Systems with Wave-Domain Programmability
Philipp del Hougne
A key question for most applications involving reconfigurable linear wave systems is how accurately a desired linear operator can be realized by configuring the system's tunable el…
Experimental Multiport-Network Parameter Estimation for a Dynamic Metasurface Antenna
Jean Tapie, Philipp del Hougne
Most use cases of reconfigurable antennas require an accurate forward model mapping configuration to radiated field (and reflections at feeds). Emerging dynamic metasurface antenna…
Effective Electromagnetic Degrees of Freedom in Backscatter MIMO Systems
Philipp del Hougne
While the definition of the effective electromagnetic degrees of freedom (EEMDOFs) of a static linear multiple-input multiple-output (MIMO) system is well established, the counterp…
Ambiguity-Aware Segmented Estimation of Mutual Coupling in Large RIS: Algorithm and Experimental Validation
Philipp del Hougne
Optimizing a real-life RIS-parametrized wireless channel with a physics-consistent multiport-network model necessitates prior remote estimation of the mutual coupling (MC) between…
Virtual VNA 3.1: Non-Coherent-Detection-Based Non-Reciprocal Scattering Matrix Estimation Leveraging a Tunable Load Network
Philipp del Hougne
We refine the recently introduced "Virtual VNA 3.0" technique to remove the need for coherent detection. The resulting "Virtual VNA 3.1" technique can unambiguously estimate the fu…
Virtual VNA 3.0: Unambiguous Scattering Matrix Estimation for Non-Reciprocal Systems by Leveraging Tunable and Coupled Loads
Philipp del Hougne
We present the "Virtual VNA 3.0" technique for estimating the scattering matrix of a \textit{non-reciprocal}, linear, passive, time-invariant device under test (DUT) with monom…
Physics-compliant diagonal representation of beyond-diagonal RIS
Philipp del Hougne
Physics-compliant models of RIS-parametrized channels assign a load-terminated port to each RIS element. For conventional diagonal RIS (D-RIS), each auxiliary port is terminated by…
Virtual VNA: Minimal-Ambiguity Scattering Matrix Estimation with a Fixed Set of "Virtual" Load-Tunable Ports
Philipp del Hougne
We estimate the scattering matrix of an arbitrarily complex linear, passive, time-invariant system with monomodal lumped ports by inputting and outputting waves only via a fixe…
Optimal blind focusing on perturbation-inducing targets in sub-unitary complex media
Jérôme Sol, Luc Le Magoarou, Philipp del Hougne
The scattering of waves in a complex medium is perturbed by polarizability changes or motion of embedded targets. These perturbations could serve as perfectly non-invasive guidesta…
Over-the-Air Emulation of Electronically Adjustable Rician MIMO Channels in a Programmable-Metasurface-Stirred Reverberation Chamber
Ismail Ahmed, Matthieu Davy, Hugo Prod'homme +2
We experimentally investigate the feasibility of evaluating multiple-input multiple-output (MIMO) radio equipment under adjustable Rician fading channel conditions in a programmabl…
Systematic Physics-Compliant Analysis of Over-the-Air Channel Equalization in RIS-Parametrized Wireless Networks-on-Chip
Jean Tapie, Hugo Prod'homme, Mohammadreza F. Imani +1
Wireless networks-on-chip (WNoCs) are an enticing complementary interconnect technology for multi-core chips but face severe resource constraints. Being limited to simple on-off-ke…
Matrix approach for optimal spatio-temporal coherent control of wave scattering
Clément Ferise, Philipp del Hougne, Matthieu Davy
We present and experimentally verify a matrix approach for determining how to optimally sculpt an input wavefront both in space and time for any desired wave-control functionality,…
Experimentally realized physical-model-based wave control in metasurface-programmable complex media
Jérôme Sol, Hugo Prod'homme, Luc Le Magoarou +1
The reconfigurability of radio environments with programmable metasurfaces is considered a key feature of next-generation wireless networks. Identifying suitable metasurface config…
Efficient Computation of Physics-Compliant Channel Realizations for (Rich-Scattering) RIS-Parametrized Radio Environments
Hugo Prod'homme, Philipp del Hougne
Physics-compliant channel models of RIS-parametrized radio environments require the inversion of an "interaction matrix" to capture the mutual coupling between wireless entities (t…
Equireflectionality and customized unbalanced coherent perfect absorption in asymmetric waveguide networks
Malte Röntgen, Olivier Richoux, Georgios Theocharis +4
We explore the scattering of waves in designed asymmetric one-dimensional waveguide networks. We show that the reflection between two ports of an asymmetric network can be identica…
Covert Scattering Control in Metamaterials with Non-Locally Encoded Hidden Symmetry
Jérôme Sol, Malte Röntgen, Philipp del Hougne
Symmetries and tunability are of fundamental importance in wave scattering control, but symmetries are often obvious upon visual inspection which constitutes a significant vulnerab…
Backpropagation-free Training of Deep Physical Neural Networks
Ali Momeni, Babak Rahmani, Matthieu Mallejac +2
Recent years have witnessed the outstanding success of deep learning in various fields such as vision and natural language processing. This success is largely indebted to the massi…
On the Tacit Linearity Assumption in Common Cascaded Models of RIS-Parametrized Wireless Channels
Antonin Rabault, Luc Le Magoarou, Jérôme Sol +4
We analytically derive from first physical principles the functional dependence of wireless channels on the RIS configuration for generic (i.e., potentially complex-scattering) RIS…