Oscar Quevedo-Teruel

TL;DR: In this paper, conformal transformation optics is employed to enhance the directivity of a horn antenna, and the phase error at the horn's aperture is mitigated using a dielectric graded-index lens designed by the conformal transform.

TL;DR: In this article, the propagation characteristics of a rectangular waveguide with aligned/misaligned double-sided dielectric-filled metallic corrugations were studied. And the authors showed that the width of the stopband between the quasi-resonant and backward modes can be controlled by the misalignment of the top and bottom corrugation, being null for the glide-symmetric case.

TL;DR: In this article, a compact nonmagnetic waveguide coupler was designed to guide and compress a vacuum-filled waveguide to a smaller waveguide with a predefined higher dielectric constant inside.

TL;DR: In this paper, a planar microstrip antenna capable of providing tunable dual bands, broader bandwidths, and higher efficiencies is proposed, which is composed of a split ring resonator (SRR) etched on a topmost dielectric slab, together with a metallic spiral printed on a middle slab beneath and shorted via a pin to the metal ground plane.

TL;DR: In this article, the periodic array of square metallic patches etched over a thin grounded dielectric sheet was used to synthesize a flat Mikaelian lens of rectangular shape that is narrower than contemporary circularly-shaped lens.