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A scattering-parameter-based method to determine electromagnetic properties of a metasurface-enabled frequency reconfigurable antenna is presented in this paper. In order to overcome the challenge of modeling the thin metasurface, we treat it together with the antenna superstrate as a slab, whose effective thickness is then numerically settled. Anisotropy is further included in the effective medium...
In this paper, we present a formulation based on surface impedance concept to model reactive impedance surface (RIS) applying the MoM-GEC method (MoM combined to generalized equivalent circuit). The study of the whole periodic infinite RIS is reduced to the unit cell modeling. We are interested especially in demonstrate the RIS impedance behavior against incidence and both TE and TM polarizations...
Polystyrene composites with 0.25 wt. % loading of oriented multiwall carbon nanotubes (MWCNTs) have been produced by stretching method. The composites showed anisotropy of transmission of millimeter wave radiation depending on sample orientation relative to the polarization of electromagnetic wave.
We use spectral theory to analyze the radiation of elementary dipoles located close to homogeneous hyperbolic metamaterials (HMs) with finite thickness, focusing on the effect of losses in the HM. We show that for loss tangents (due to anisotropy) smaller than or equal to 10−1 the effect of the HM on dipole radiation is twofold: first, it induces an enhancement in the emitted power; second, most of...
Soil water measurement is important in water management for irrigation and hydrologic sciences. The purpose of this paper is to describe the design of a cylindrical access-tube mounted waveguide for use in time-domain reflectometry (TDR) for in-situ soil water content sensing. In order to optimize the design with respect to sampling volume and losses, we derived the electromagnetic fields produced...
Reflection of a plane electromagnetic wave from the fine-stratified structure located on a metal substrate is considered. A number of features caused by specific properties of effective permittivity are arises. It has been shown, that dependences on a frequency and magnetic field allow to change polarizing characteristics (field ellipticity).
In the past decade, left-handed metamaterials (LHMs), which were first named and theoretically discussed by Veselago [1], have been extensively studied throughout the world. They are composed of arrays of split-ring resonators (SRRs) and wires [2], [3] which exhibit negative permittivity and permeability, respectively. The first LHM was constructed and experimentally demonstrated by Smith et al. in...
This paper discusses the design of a 60 GHz low noise amplifier (LNA) using a standard low power SOI CMOS process from ST Microelectronics. First, we outline the technology as well as the mm-wave design challenges. Using recent work on coplanar waveguide (CPW) modeling, we describe how it's possible to use parametric, 3D electromagnetic simulation to complete or replace analytical models of on-chip...
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