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In this letter, we propose and study a 2-D glide-symmetric dielectric periodic structure. We demonstrate that glide symmetry broadens the bandwidth of operation and achieves lower effective refractive indices when compared to non-glide configurations. These two properties are beneficial for producing graded-index lens antennas. To demonstrate the potential of the proposed unit cell, we designed a Luneburg lens operating in the K- and K<inline-formula><tex-math notation="LaTeX">$_\text {a}\!$</tex-math></inline-formula>-bands. The lens was manufactured with conventional additive manufacturing and it has a potential use for future wireless communications given its low-cost and low-profile.

Two-Dimensional Glide-Symmetric Dielectric Structures for Planar Graded-Index Lens Antennas