A radially periodic TE-polarized leaky-wave Bessel-beam launcher at submillimeter waves

The generation of a limited-diffractive, focusing, and self-healing field profile is crucial for the implementation of next-generation, near-field, wireless links. For this reason, this work presents a wideband, leaky-wave Bessel-beam launcher realized through a planar, low-profile, cost-effective grounded dielectric slab with a radially periodic metal strip grating printed on top. The proposed device, excited by a circular waveguide, can generate a transverse-electric-polarized Bessel beam at 300 GHz, reaching a nondiffractive range of 25 mm with an aperture radius of just 12.75 mm. Theoretical results, obtained through an effective and elegant leaky-wave approach, are in a remarkable agreement with full-wave simulations, corroborating the launcher design.