A broadband reflectarray antenna with double square rings

Abstract

Discussion of the Bistatic Scattering Coefficients Averaged over 30 Realizations Figure 7 shows the simulation of the bistatic-scattering coefficients averaged over 30 realizations through the UV method. The rms heights are 0.03, 0.06, and 0.09, respectively, and all of their correlation lengths are 1.03, the permittivity of the dielectric rough surface is 1 ϭ 10.8 Ϫ j1.6. The surface lengths are 8 ϫ 8 wavelengths and the incidence angle is 30°. The reflectivity of the dielectric rough surface is calculated through integral over above space. Figure 7 shows that the backscattering coefficient will increase with rms height increasing, as does the reflectivity. The CPU time of the UV method will also increase for iteration number's increase. Meanwhile, the specular scattering coefficient will decrease, as opposed to increase of the rms height. CONCLUSIONIn this paper, the UV-MLP method has been used for a rapid solution of the integral equation in 3D dielectric rough-surface scattering. The method can be applied to 3D PEC rough-surface scattering, and volume scattering of moderate-size particles using high-order spherical-wave Green's functions. Presently, the case of vector electromagnetic wave scattering by lossy dielectric random rough-surfaces is being studied.

Wideband microstrip reflectarray using dual-resonance unit cell

“…The reflectarray achieves peak gain 27.9 dBi at 45 GHz. The 1-dB gain bandwidth of the proposed reflectarray is about 39.78%, from 39.5 to 57.4 GHz, which is broader than the one of those reflectarrays in [4]- [8].…”

“…1. The array element is fabricated on a Rogers RT5880 dielectric substrate with thickness 0.508 mm, relative permittivity 2.2 r , and loss tangent tan 4 9 10 . The substrate is suspended above the ground plane with distance h2 = 1 mm.…”

“…To overcome the problem of narrow bandwidth, the approach of multi-resonance elements [4], [5], multilayer variable-size patches [6] and sub-wavelength patches [7], [8] were proposed, and the 1-dB-gain bandwidths of above mentioned reflectarrays achieved are 9.0%, 30.0%, 16.7%, 9.1%, and 17.0%, respectively.…”

A High-Efficiency Transmitarray Antenna Using Double Split Ring Slot Elements

“…Multiple resonance structures are widely used in reflectarray to achieve a linear phase response and improve the bandwidth of antenna [6] [7]. So another concentric ring slot is added to constitute double split rings slot element, as shown in Fig.1.…”

Reflectarray research at the communications research centre Canada

“…As shown in this figure, increasing the thickness of the substrate reduced the slope of the phase plots, which led to wideband operation of the reflectarray. More than 500' of phase variation could be achieved by using thick substrates [39, 40].…”