Abstract: Techniques are described for forming a gradient index (GRIN) lens for propagating an electromagnetic wave comprising receiving, by a manufacturing device having one or more processors, a model comprising data specifying a plurality of layers, wherein at least one layer of the plurality of layers comprises an arrangement of one or more volume elements comprising a first dielectric material and a second dielectric material, wherein the at least one layer of the plurality of layers has a dielectric profile that is made up of a plurality of different effective dielectric constants of the volume elements in the layer, and generating, with the manufacturing device by an additive manufacturing process, the GRIN lens based on the model.

Abstract: The collapsible, pop-out bib of the present invention includes a lower bowl section to catch food or beverage spills. Said lower bowl section comprises a guide sewn into it's upper edge, this guide is created by either a simple fold in the web material's fabric, or by attaching a fabric tape or bias tape to the upper edge of the lower bowl section and continues around the entire perimeter of the lower bowl section's upper edge. The bib of claim also comprises an enlongated flexible spring material that is inserted into said upper edge guide to continue around the entire perimeter of the lower bowl section's upper edge. Said spring material comprises a male/female connector on opposing ends that enable the ends to be fastened together to form a large single-looped configuration, thereby creating tension on the periphery of the upper edge of said bowl, which holds the bowl out and open to catch spills.