Wide-Band/Angle Blazed Dual-Mode Metallic Groove Gratings

A simple approach to acquire wide-band/angle blazing operation in 1-D metallic gratings is investigated by means of mode-matching and equivalent circuit analysis. The are single-groove perfectly conducting that support two propagating guided modes (opposed typical single-mode cases). It shown under what conditions one can achieve over a wide range frequencies angles. Most importantly, it identified governs blazing, particular the true matching condition needs be satisfied, how structures' multiple resonances play role achieving such tailoring bandwidth. Parameters proposed model for case transverse magnetic (TM) polarization analytically derived. accuracy models verified through comparison against results full-wave simulations. procedure performance delineated, design parameters explicitly given. this structure strongly transfer power TM polarized incident wave -1st diffraction order with fractional bandwidth ≈50% at working frequency $f_{0}=10$ GHz -10 dB specular reflection loss, thus realizing broadband structure. From model, an insightful discussion presented various mechanisms when Bragg off-Bragg occurs fully justifies behavior device. technique opens up new vistas applications, as spectroscopy, Littrow cavities, beam splitters, refractive index biosensors, scanned antenna reflectors.