5 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…
Fully Scalable Polarization-Reconfigurable S/X-Band Shared-Aperture Phased Array for Ultra-Low Axial-Ratio Scanning
Mohamed Räsänen, Juha Ala-Laurinaho, Samuel de Jésus Ndimubandi +8
This paper presents a modular S-/X-band shared-aperture phased-array antenna (SAPAA) for satellite-communication ground-station reception. The proposed architecture uses a repeatab…
Mutual-Coupling-Aware Optimization of a Time-Floquet RIS for Harmonic Backscatter Communications
Aleksandr D. Kuznetsov, Ville Viikari, Philipp del Hougne
This Letter studies the optimization of a wireless communications system empowered by a periodically time-modulated reconfigurable intelligent surface, coined time-Floquet RIS (TF-…
Adjustment of Cluster-Then-Predict Framework for Multiport Scatterer Load Prediction
Hanjun Park, Aleksandr D. Kuznetsov, Ville Viikari
Predicting interdependent load values in multiport scatterers is challenging due to high dimensionality and complex dependence between impedance and scattering ability, yet this pr…
Electromagnetically Consistent Bounds on Information Transfer in Real-World RIS-Parametrized Wireless Channels
Albert Salmi, Ville Viikari, Philipp del Hougne
A reconfigurable intelligent surface (RIS) endows a wireless channel with programmability that can be leveraged to optimize wireless information transfer. While many works study al…