Off‐Bragg TM blazing of a periodic strip grating over a grounded dielectric slab

Wide-band/angle Blazed Surfaces using Multiple Coupled Blazing Resonances

“…4a that for the case of w = 4.1 mm, two additional off-Bragg blazing points exist about the Bragg line. While their nature and justification of existence is beyond the scope of this work, we note that such off-Bragg blazing phenomena are known to exist 10 14 29 31 , and can help to further broaden the range of angles over which specular reflection is minimized as will be shown later. Assuming a wideband model exists for the circuit of Fig.…”

“…Planar and printed gratings, such as those shown in Fig. 1c,d have also been shown to blaze efficiently 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 . Blazed gratings have been used from microwaves to optics, and in different applications such as Littrow mounts 6 and external cavity lasers, frequency scanning antenna reflectors 38 39 40 41 42 , and Radar Cross Section (RCS) reduction surfaces 19 20 21 , to name a few.…”

“…Blazed gratings 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 can reflect an oblique incident wave back in the direction of incidence with low or even zero specular scattering, unlike mirrors and metal plates. The scattering of the incident wave into diffraction orders is dictated by the grating periodicity, which is in the order of the free-space wavelength for blazing.…”

“…As another example, conductor-backed dielectric-rod based gratings were also shown to exhibit strong blazing in optics 11 . Groove gratings and strip gratings on conductor-backed dielectrics have been studied for the so-called Bragg 2 6 16 23 and Off-Bragg blazing 6 7 8 10 13 14 29 31 (see Methods) in both polarizations. Extending the bandwidth of finite planar blazed structures were investigated using non-periodic geometrically growing strips widths 18 , or using gratings with tapered strips in the transverse direction 21 .…”

“…To this end we first study a single resonant strip 37 in the unit-cell as shown in Fig. 1d and e. In previous studies on strip loaded grounded dielectric gratings 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 , the strip width was large (typically around half the cell size) and held constant, while other parameters such as the dielectric thickness was adjusted to observe a blazing phenomenon. In this work, we utilize a standard single layer microwave substrate with a given fixed thickness, much thinner than previous works.…”