Ultra-wideband side-lobe level suppression using amplitude-adjustable metasurfaces

Abstract

An amplitude-adjustable metasurface has been proposed to suppress the side-lobe level over an extra-wide frequency band. A polarization-selective unit cell is designed to constitute the metasurface, which can manipulate the amplitudes of the co-polarization reflection coefficients and cross-polarization transmission coefficients, while the phases remain unchanged. The amplitude of the metasurfaces is discretely Taylor-distributed. For example, two metasurfaces were designed to achieve side-lobe level suppression (SLLS), of reflected and transmitted beams, respectively. The simulations demonstrated that two metasurfaces have good performance on SLLS of reflected/transmitted beams, with approximately −20 dB SLL in a wide frequency region. It is expected that the designed amplitude-adjusted metasurfaces may find potential application in antennas and stealth techniques.

Optimized chemical potential graphene-based coding metasurface approach for dynamic manipulation of terahertz wavefront

“…Metasurfaces are ultrathin structures composed of subblocks that have a significant susceptibility to EM wave manipulation. By deliberately designing these subblocks, meta-atoms can generate different phase and amplitude discontinuities for various utilization such as analog computing [6,7], wave manipulation [8][9][10] side-lobe level suppression [11], polarization converter [12], and power divider [13]. In recent years, digital coding metasurfaces have been proposed to develop metasurfaces from digital prospects and obtain programmable functionalities using a single meta-atom.…”

A low-complexity algorithm for maximizing the weighted sum-rate of intelligent reflecting surface aided wireless communication

“…, where m  is the phase of m -th reflection element on the IRS. Here we assume the ideal IRS situation, the amplitude and phase related to the IRS unit can be independently and continuously controlled [12], that is…”

Stereo Meta‐Atom Enabled Phase–Amplitude Gradient Metasurface for Circularly Polarized Waves

“…[7][8][9] In many practical applications, however, the EM responses are required under full manipulation for both amplitude and phase (A-P), such as quality-enhanced holography, [10] multibeam forming, [11] and low side-lobe antennas. [12,13] This poses a challenge for conventional metasurface design since the A-P usually interferes with each other. To overcome this difficulty, a C-shaped meta-atom, for example, is proposed to control the A-P responses of cross-polarized wavefronts by adjusting the opening and orientation angles for reflective metasurfaces.…”