On the reduction of phase-aberrations in three-dimensional Rotman lens design

PCB-Based Design of a Beamsteerable Array With High-Gain Antennas and a Rotman Lens at 28 GHz

“…This was expected and is mainly caused by scan loss as the beam is steered to a wider angle and the single element pattern is highly directive toward θ = 0 • direction which limits the beamsteering range [75]. Additionally, aberration losses in the Rotman lens are typically higher for wider beam angles [76,77].…”