High-Impedance Surfaces With Periodically Perforated Ground Planes

129

A broadband and polarization-insensitive high impedance surface (HIS) metamaterial absorber (MA) based on octagonal ring-shaped resistive patches is presented. The absorber is investigated theoretically, experimentally and by simulation. The simulated results indicate that this structure obtains 10.28 GHz-wide absorption from 3.65 to 13.93 GHz with absorptivity larger than 90% at the normal incidence. Experimental results are in accordance with those of the simulation results. The electromagnetic (EM) field distributions and the plots of surface power loss density have been illustrated to analyze the absorption mechanism of the structure. Further simulations of the absorptivity of the proposed absorber with different surface resistances and substrate thicknesses indicate that there exist optimal values for the design. The polarization-insensitive feature and the properties under oblique incidence are also investigated. Finally, the interference theory is introduced to analyze and interpret the broadband absorption mechanism at both normal and oblique incidence. The calculated absorption rates of the proposed absorber coincide well with the simulated results. Therefore, the simulated and experimental results verify the validity of the theoretically analytical method for this type of broadband absorber.Index Terms-High impedance surface (HIS), metamaterial absorber (MA), broadband, microwave, interference theory.

Section: Multi-reflection Interference Theorymentioning

confidence: 99%

“…Although Jaumann screen showed better broadband absorptive performance, the thickness of the absorber was egregious and limited its applications. Therefore, lossy HIS absorber, composed of resistive film and dielectric substrate, was considered for broadband absorber [9][10][11][12].…”

mentioning

confidence: 99%

High-Impedance Surface-Based Broadband Absorbers With Interference Theory

Chen

Wang

et al. 2015

129

“…Mutual coupling reduction has been a topic of interest since the early days of antenna array design. The most commonly reported approaches include the use of: (1) defected ground structures (DGS) [2], [3], (2) electromagnetic band-gap (EBG) structures [4], [5], (3) soft surfaces [6], [7], (4) parasitic elements [8], [9], and (5) combinations of these [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

Automatic AI-Driven Design of Mutual Coupling Reducing Topologies for Frequency Reconfigurable Antenna Arrays

Zhang

Akinsolu

Liu

et al. 2021

“…For example defected ground structures have been implemented by etching slots of different shapes in the ground plane [11]- [14] and using electromagnetic bandgap structures to reduce the surface waves [15]- [17]. Other approaches to reduce the surface-wave coupling include high-impedance surfaces [18], [19] or soft surfaces [20], [21]. However, the free-space coupling and surface-wave coupling mechanisms and their contributions are not clearly distinguished in previous papers.…”

Section: Introductionmentioning

confidence: 99%

Surface-Wave Coupling and Antenna Properties in Two Dimensions

Wang

Sievenpiper

2017

Antennas are characterized by their gain and effective aperture area, and the coupling between two antennas in 3-D free space is governed by the Friis transmission equation. In this paper, we derive the properties of antennas in 2-D space, and the equivalent coupling equation. This is useful for evaluating surface-wave coupling between antennas that share the same ground plane or substrate. We propose a quantity which is the effective width for surface-wave coupling, and derive its value for an isotropic surface-wave radiator in two dimensions. We also determine the surface-wave directivity for dipole-like modes, which is relevant to many small planar antennas. The total coupling between two coplanar antennas is a combination of surface waves and space waves, and these two components are distinguished in simulations by calculating antenna coupling as a function of distance. Several simple examples are illustrated including patch and monopole antennas on various substrates. Quantifying the effective surface wave width can serve as a useful tool for optimizing the coupling between coplanar antennas.