WebAn outstanding challenge in optical antenna design lies in achieving high radiation efficiency, ultra-compact footprint and broad radiation angle simultaneously, as required for dense 2D OPAs with a broad steering range. Here, we demonstrate a fundamentally new concept of a nanophotonic antenna based on near-field phase-engineering. Web1 de jul. de 2008 · The proposed antenna is a square patch radiator with four L-shaped slits are presented. The proposed antenna radiates at 3GHz resonance frequency with …
Phys. Rev. A 90, 052322 (2014) - All-optical quantum storage based on ...
WebIn this paper, we present and demonstrate a novel approach of a true time-delay (TTD) optical feeder for phased-array antennas (PAAs). A continuously variable TTD is achieved by employing tunable lasers and a wide-bandwidth chirped fiber Bragg grating (FBG) as the dispersive element. The results show that a very high resolution performance (equivalent … Web8 de abr. de 2024 · Abstract: A longitudinally miniaturized H-plane horn antenna with suppressed sidelobes by redistributing the field on the radiating aperture is proposed by loading a few rectangular blocks. The substantial longitudinal length reduction (around 50% of an optimal horn) will cause a nonuniform phase and nontapering magnitude … the hgv and me youtube
Chirped Automotive Radar Sensor Systems Design and Analysis
Web30 de set. de 2008 · We propose an efficient method for spatial filtering of light beams by propagating them through 2D (also 3D) longitudinally chirped photonic crystals, i.e. through the photonic structures with fixed transverse lattice period and with the longitudinal lattice period varying along the direction of the beam propagation. We prove the … Web1 de out. de 2013 · Here, a variant of the longitudinally-graded optical fiber (LGF) fabrication process is employed in order to realize cores of rectilinear cross-section (i.e. … As described in antenna far-field broadening section, we propose to overcome the ineffectiveness of longitudinal chirping in few-period antennas using transversal chirping. Instead of chirping the grating period along the propagation direction, the antenna is implemented by transversally interleaving two gratings … Ver mais As a reference case of an antenna with high scattering efficiency36, we consider a single-etch, periodic grating in a standard SOI platform with a 300-nm-thick silicon waveguide core, 1-μm buried oxide (BOX) and 2-μm oxide … Ver mais In order to evaluate the effect of longitudinal chirping on the far-field beam width, we design an antenna with the structure described in periodic grating antenna section, but considering different periods for the three … Ver mais the hgtv brothers