The performance of a novel simulated corrugated surface for the reduction of radar cross section

Mathew, Thomaskutty; Stephen, D. Saji; Jose, K. A.; Aanandan, C. K.; Mohanan, P.; Nair, K.G.

doi:10.1002/mop.4650061017

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…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.…”

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confidence: 99%

“…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.…”

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confidence: 99%

“…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.…”

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

Memarian

Morimoto

et al. 2017

Sci Rep

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Blazed gratings can reflect an oblique incident wave back in the path of incidence, unlike mirrors and metal plates that only reflect specular waves. Perfect blazing (and zero specular scattering) is a type of Wood’s anomaly that has been observed when a resonance condition occurs in the unit-cell of the blazed grating. Such elusive anomalies have been studied thus far as individual perfect blazing points. In this work, we present reflective blazed surfaces that, by design, have multiple coupled blazing resonances per cell. This enables an unprecedented way of tailoring the blazing operation, for widening and/or controlling of blazing bandwidth and incident angle range of operation. The surface can thus achieve blazing at multiple wavelengths, each corresponding to different incident wavenumbers. The multiple blazing resonances are combined similar to the case of coupled resonator filters, forming a blazing passband between the incident wave and the first grating order. Blazed gratings with single and multi-pole blazing passbands are fabricated and measured showing increase in the bandwidth of blazing/specular-reflection-rejection, demonstrated here at X-band for convenience. If translated to appropriate frequencies, such technique can impact various applications such as Littrow cavities and lasers, spectroscopy, radar, and frequency scanned antenna reflectors.

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

Memarian

Morimoto

et al. 2017

Sci Rep

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“…Concerning their applications, diffraction gratings have been widely used in laser resonators to tune and narrow lasing bandwidth [2], [3]. Blazed or echelette gratings [4], [5], [6] capable of scattering an incident wave into a specific diffraction order have been applied in frequency-scanning reflector antennas [7], [8], [9], [10] and for radar cross section (RCS) reduction [11], [12] at microwave frequencies and in Littrow mount external cavity lasers in optics [13]. Classical blazed gratings are three-dimensional (3D) structures that generally take the form of right-angle sawtooths [14] and rectangular grooves [5].…”

Section: Introductionmentioning

confidence: 99%

Beamforming With Metagratings at Microwave Frequencies: Design Procedure and Experimental Demonstration

Popov

Boust

Burokur

2020

IEEE Trans. Antennas Propagat.

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As opposed to metasurfaces, metagratings represent themselves sparse arrangements of scatterers. Established rigorous analytical models allow metagratings to overcome performance of metasurfaces in beam steering applications while handling less degrees of freedom. In this work we deal with reflective metagratings that have only as few as one degree of freedom (represented by a reactively loaded thin wire) per each propagating diffraction order. We present a detailed design procedure and fabrication of three experimental samples capable of establishing prescribed diffraction patterns. The samples are experimentally studied in an anechoic chamber dedicated to radar-cross-section bistatic measurements and results are compared with three-dimension full wave numerical simulations. We identify and analyze factors affecting operating frequency range of metagratings, suggest a strategy to increase the bandwidth.

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“…Moreover, RAM based solutions are not rigid and susceptible to degradation in harsh environments. Another technique, which circumvents the heating problem and can have a rigid metallic profile, is based on diffraction gratings [1,4] where the reflected power is redirected eliminating both specular reflection [5][6][7] and backscattering [8]. At difference with RAM solutions, gratings absorb only a small amount of the incident energy and can be used in high power systems.…”

Section: Introductionmentioning

confidence: 99%

Wideband backscattering reduction at terahertz using compound reflection grating

2017

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Backscattering reduction is usually achieved by using either absorbers or diffractions gratings at the expense of a narrow bandwidth. In this paper, we propose a different strategy based on a metallic compound reflection grating (CRG). We demonstrate that this structure allows a strong and broadband (fractional bandwidth, FBW ≈57%) backscattering reduction in the terahertz (THz) range by efficiently transferring the incident energy to the diffracted modes. The design is analyzed in terms of equivalent circuit and numerical simulations and the results are corroborated by a manufactured prototype operating at 0.35 THz.

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The performance of a novel simulated corrugated surface for the reduction of radar cross section

Cited by 5 publications

References 8 publications

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

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

Beamforming With Metagratings at Microwave Frequencies: Design Procedure and Experimental Demonstration

Wideband backscattering reduction at terahertz using compound reflection grating

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