A Highly Efficient Spherical Luneburg Lens for Low Microwave Frequencies Realized with a Metal-based Artificial Medium

This article describes a novel spherical lens antenna constructed of planar layers of lightweight foam with equally spaced conducting inclusions of varying sizes on an orthogonal grid. This construction largely overcomes the problems of weight and cost that have tended to make larger low-frequency Luneburg lenses impractical. A penalty for this type of design is that some anisotropy exists in the ...