10 papers
Advanced Superdirective Antennas
Alex Krasnok
Superdirective (supergain) antennas aim to produce a narrow main beam from radiators that are electrically small compared with the wavelength. Instead of enlarging the physical ape…
Purcell-Like Environmental Enhancement of Classical Antennas: Self and Transfer Effects
Alex Krasnok
Environmental 'range boosts' in wireless links are often explained through radiation-pattern intuition, yet the underlying physics is more cleanly captured by two environment-contr…
Constant-Amplitude Phase Modulation from Topological Pole--Zero Winding
Alex Krasnok
Resonant phase shifters inevitably mix phase and amplitude. We present a topological synthesis that guarantees a full phase swing at a prescribed constant scattering magnitude…
Twist-Tuned Strong Coupling in Sub-GHz Wire Metasurface Bilayers
Ingrid Torres, Alex Krasnok
Twist-angle control offers a bias-free route to reconfigurable metasurfaces, yet its extension to deeply subwavelength resonant platforms at VHF/UHF remains limited. We demonstrate…
Coherently Assisted Wireless Power Transfer Through Poorly Transparent Barriers
Alex Krasnok
Poorly transparent barriers (e.g., reinforced walls, shielding panels, metallic or high-contrast dielectrics) strongly reflect incident radiation, limiting wireless power transfer…
A Cryogenic Dielectric Antenna for Wireless Sensing and Interfacing Outside the 10 K Environment
Ingrid Torres, Alex Krasnok
The performance and scalability of cryogenic microwave systems, particularly for quantum processors, are fundamentally limited by the thermal stability and loss of their constituen…