Tipo di tesi
Tesi di laurea magistrale
Titolo
Study of Artificial Flat Lenses for 140 GHz Automotive Radars
Dipartimento
INGEGNERIA DELL'INFORMAZIONE
Corso di studi
INGEGNERIA DELLE TELECOMUNICAZIONI
Riassunto (Italiano)
Automotive radar in the 134–141 GHz D-Band demands both high angular resolution (SRR) and high gain (LRR). This work designs a low-profile flat GRIN lens using annular dielectric layers (ADLs) to reproduce radial and later azimuthal permittivity gradients, optimized by a MATLAB ray-tracing tool and implemented in CST. Quarter-wavelength matching layers reduce reflections; the feed is a cavity-backed double-slot element whose dimensions were tuned by MoM analysis and an anisotropic matching slab. An 8 element array (spacing for −3 dB overlap) initially showed gain loss at large scan angles; remedies included side reflectors, edge-element tilt and conjugate field weighting. Vertical displacement of the array enabled further profile reduction; adding azimuthal permittivity variation recovered focal performance. The azimuthal flat lens achieves ~50% profile reduction versus a curved dielectric lens with comparable broadside gain, though scan-angle roll-off is influenced by the matching layers and broadside-optimized design.
