Ultrabroadband Design for Linear Polarization Conversion and Asymmetric Transmission Crossing X- and K- Band

Abstract

In this work, a high-efficiency and broadband reflective converter using ultrathin planar metamaterial (MM) composed of single-layered SRR is firstly realized. Numerical and experimental results demonstrate that the cross-polarization conversion reflectance above 0.84 is achieved from 8.6 to 18.6 GHz for linearly polarized (LP) incident waves under normal incidence. Subsequently, a multi-layered MM based on SRR enables a dramatic improvement of the recently demonstrated asymmetric transmission (AT) effect. Theoretical and measured results present that strong one-way transmission of two orthogonally polarized waves crossing C- and K- band has been observed. These two separated AT pass-bands have a function of selective polarization filter, which can be switched on/off by changing the polarization state of incident waves. The physical mechanisms are elucidated by taking advantage of electric fields and current distributions. Considering the broad bandwidth and the dual band, we believe that these two structures will be beneficial for designing polarization-controlled and selective transmission converter.

A Novel Six-Band Polarization-Insensitive Metamaterial Absorber With Four Multiple-Mode Resonators

“…Due to the exotic electromagnetic characteristics, the metamaterials have been widely applied in filters [2], antennas [3], polarization converters [4], absorbers [5], etc. Compared with classical absorbers, the absorbers based on metamaterials have the advantages of light weight, small size and nearly perfect absorption [5].…”

A Multi-Physics Battery Model with Particle Scale Resolution of Porosity Evolution Driven by Intercalation Strain and Electrolyte Flow

“…The particles are connected by carbon-binder providing a path for current flow, while preventing the lithium from diffusing across active particles. Motivated by the multi-layered microstructure of the separator, 36 we model it with six layers of elongated polymeric particles with sub-branches . The cell is sandwiched between two current collectors.…”

“…For the polymeric separator, the thickness of the main branch is ∼ 1 µm, and ∼ 0.2 µm for the sub-branches, which is comparable to the microstructure seen in SEM images. 36 To study the volume change driven primarily by lithium intercalation, we define eight volume elements over the negative electrode, six over the positive electrode and one for the separator, as shown in Figure 4. For each volume element, we can evaluate the total volume and volume for each VE…”

Design and Implementation of High Efficiency and Broadband Transmission-Type Polarization Converter Based on Diagonal Split-Ring Resonator

“…The asymmetric transmission phenomenon in linear polarization converter was firstly observed by Fedotov et al [1]. After that, many methods and designs such as multi-layer MMs have been proposed to enhance the magnitude of asymmetric transmission effect [29][30][31][32][33][34][35]. In 2011, Kang et al [36] proposed a Sshaped MM whose transmission polarization conversion efficiency is over 0.8 in the opposite propagation directions and exhibits an asymmetric transmission of linearly polarized waves at 6.2 GHz.…”