Electromagnetic wave source visualization system with Lüneburg lens

A new real-time and high resolution electromagnetic wave source visualization system is presented. The system can determine the angle of incidence and visualize the wave source by combining a Lüneburg lens and an electromagnetic band gap (EBG) absorber. The Lüneburg lens is used to physically separate the different direction incident wave and focus them into the different focal points on the lens surface. The every element of EBG absorber is coincide with a different focal point on the lens surface, the intensity and angle information of the incident wave can be obtained based on the absorbed power and position of the corresponding sensor element. The estimated angular resolution is ± 0.75 degree theoretically and the system sensitivity is -90dBm at 2.45GHz. The results have been confirmed by simulations and prototype evaluations.