engleski

Analysis of Spherical Lens Antennas – Comparison of Two Approaches

The paper presents a comparison of two approaches for analyzing spherical lens antennas – spectral-domain method and ray-tracing method. The spectral-domain method takes advantage of transforming the threedimensional problem into a set of one-dimensional problems. The spherical lens antenna is rigorously taken into account by implementing the Green’ s functions for the multilayer spherical structures. Different types of feeding antennas can be easily included in the analysis method by calculating the vector-Legendre transformation of the equivalent or physical currents that represent the considered feed. The ray-tracing method is a general analysis method that can be applied to all kinds of lenses with general (non-symmetric) shape. The results of the analysis are compared with measured radiation pattern of a 12 layer Luneburg lens antenna.

lens antennas; spectral domain method; ray-tracing method; Luneberg lens

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