According to the electromagnetic uniqueness theorem, radiation behavior of an antenna under test (AUT) can be recovered from measurements two tangential components its radiated fields on enclosing surface. In practice, conducted in radiating near-field (NF) AUT utilize probe antennas finite size. Thus, instead discrete field values, spatially blurred signals are acquired. The influence compensa...

This thesis provides a comprehensive study of the coupling phenomena that occur in plasmonic nanostructures. Electromagnetic coupling between metallic nanoparticles leads to strong spectral modifications in the structures, which are determined using linear optical spectroscopy in the visible and infrared wavelength range. In contrast to previous investigations, the key aspect here are the prope...

Extremely large-scale massive MIMO (XL-MIMO) is a promising technique for future 6G communications. However, existing far-field or near-field channel model mismatches the hybrid-field feature in practical XL-MIMO system. Thus, and estimation schemes cannot be directly used to accurately estimate channel. To solve this problem, we propose an efficient scheme by modeling Specifically, firstly rev...