Dissipation Losses in Artificial Dielectric Layers

Abstract

Closed-form expressions to describe artificial dielectric layers (ADLs) with finite conductivity are presented. The propagation of a generic plane wave within the artificial material is described by means of transmission line models, where each layer is represented as an equivalent shunt impedance. The given analytical formulas for the shunt impedance are derived assuming finite conductivity of the metal, thus also an accurate estimation of the losses within the artificial dielectric is obtained from the equivalent circuit. The expressions account for the reactive coupling between the layers due to higher order Floquet modes, thus remain valid even for extremely small electrical distance between layers.

One-Plane Glide-Symmetric Holey Structures for Stop-Band and Refraction Index Reconfiguration

“…The theoretical analysis of some of these structures with glide symmetry was carried out using the Floquet theorem [12][13][14], which provides an effective tool for the analysis of periodic structures. Glide symmetries were successfully used to reduce the dispersion of periodic structures [15][16][17][18], to increase the equivalent refractive index [19][20][21][22], or to increase the band and attenuation of electromagnetic bandgaps [10,[23][24][25]. For example, glide symmetry was proposed to produce lens antennas for fifth-generation (5G) communications [26,27], taking advantage of their ability to generate a higher refractive index, less dispersion, and more isotropy [9].…”

Periodic Structures With Higher Symmetries: Their Applications in Electromagnetic Devices

“…In this work, the authors demonstrated that nearby layers of patches that possess glide symmetry are able to produce higher equivalent refractive indexes. Similarly, glide symmetry is a good candidate for producing dense materials that can be used for lens antennas [60], [61]. Other recent implementations of two-dimensional glide-symmetric structures include multi-layer glide-symmetric metasurfaces [62], [63], dielectric lenses [64], reconfigurable planar lenses in the optical regime [65], and broadband slow acoustic waves [66].…”

Analysis of the effect of dielectric losses on the bandwidth of microstrip patch antenna in stacked geometry and modelling

“…Dependence, on both temperature and frequency, of both the dielectric constant (DK) and the dissipation factor (DF) has been already reported in many research papers [1,[6][7][8][9][10][11][12][13]. However, DK and DF in datasheets are average values (typical values).…”