Materials Literature
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This paper describes a nonlinear Fresnel zone plate reflector designed to operate at 2.8GHz. The alternating Fresnel zones of the reflector are made from two different nonlinear metamaterials: one that reflects like a short circuit at low incident power levels and another that reflects like an open circuit. Both metam…
Conducting loops have been rigorously analyzed in the microwave/RF regime due to their simplicity and versatility. In the terahertz, infrared and optical regimes nanoloops are extremely promising for a variety of applications, including as solar cells or optical sensors. However, due to the complex behavior of metals,…
Magnetoelectric materials exhibit altered permeability with the application of a static electric field. As such magnetoelectric materials have the potential to affect the radiation properties of antennas loaded with such a material. In this paper, we explore the radiation properties of patch antennas loaded with slabs…
In recent years, there has been immense interest in two-dimensional metallic gratings based on plasmonic nanoparticles. The enhanced fields in these structures due to the plasmonic resonance of nano-particles, makes them ideal candidates for a variety of applications. Many of these studies have utilized spherical nano…
In this contribution, we propose the design of optical metasurfaces able to reduce the visibility of plasmonic microstructures at optical frequencies. The proposed devices, consisting of arrays of properly shaped nanoparticles, are designed exploiting a rigorous analytical model and form realistic examples of optical…
Sandwich panels made of fiber-reinforced polymer (FRP) skins and light-weight core materials have the potential to be effectively used in several structural applications such as cladding, decking, and roofing panels. The FRP skins resist the tensile and compressive stresses resulting from the flexure induced by transv…
Design and simulation of a conformai high impedance surface with spherical curvature is reported. A loop antenna is located in the vicinity of this curved surface to investigate if the spherical HIS can be used as an appropriate ground plane. The return loss and gain pattern of the loop is obtained from simulations an…
The quasi-conformal transformation optics (QCTO) technique is employed to design flat TO gradient-index (GRIN) Fresnel-type lenses. Because the targeted Fresnel lenses possess complex curvatures and contour profiles with sharp corner boundaries, the QCTO algorithm cannot be applied directly to transform them into a fl…
This paper has proposed a method constructing composite right/left-handed cylindrical waveguides. In this waveguide, negative permeability is realized by the cut-off TM01mode in a hollow waveguide and also negative permittivity is realized by the cutoff dominant TE mode in a sector waveguide with a ridge. Usefulness o…
We propose an ultrathin planar structure which equally splits the power of a normally-incident plane wave into two beams outgoing at oblique angles, without incurring reflections. The design is based on an omega-type bianisotropic metasurface (O-BMS), exhibiting electric and magnetic polarizability, as well as magneto…
Transformation optics is applied to interpret the dispersive nature of materials via changes in geometry, providing an alternative methodology for dispersion correction. An example is proposed and analyzed to demonstrate the effectiveness of the proposed technique.
We present a method to reshape the radiation pattern of an antenna into an arbitrarily defined pattern through the use of a spherical impedance metasurface that completely encloses a source. We derive analytical equations to determine the sheet impedance distribution of the spherical metasurface to realize a 4π sterad…
A graded dielectric superstrate is designed using transformation optics to couple the radiation from a leaky slot line into free space. Due to coordinate stretching during the transformation process, the phase profile along the air-dielectric interface is not linear, leading to an unsatisfactory radiation pattern. By…
Fiberglass composites with three dimensionally varying dielectric properties have been created using a novel dry powder dot deposition system. The out of plane and in plane effective properties were previously determined empirically with separate methods. This work establishes an analytic effective media approach to c…
The effects of geometry modulation applied to a periodic structure built in stripline technology are assessed by means of the dispersion diagrams calculated in the spectral, or k, plane by using a commercial electromagnetic eigenmode solver. Modifications of surfaces representing propagation modes, of electromagnetic…
This contribution presents the design of a low pass filter LPF with wide rejection based on modified complementary single split ring resonator (CSRR). The CSRRs are etched on the back side of the transmission and connected by slot line to achieve the desired resonance frequency. The quasi-static resonance of the CSRRs…
The CdCl2heat treatment (HT) is one of the most critical steps in the fabrication of high efficiency CdTe solar cells. In this study a laser based CdCl2treatment is presented. A high power near infrared (808 nm) diode laser was used for laser annealing (LA) CdTe cells. The effect of laser power density (LPD) and annea…
This paper describes the design and behavior of a Fabry-Perot Cavity (FPC) antenna system with split beam in the near-field and decreased beamwidth of the far-field pattern. The FPC antenna system is a coplanar waveguide (CPW)-fed slot antenna with 9 × 27 rectangular aperture unit cells in the frequency selective surf…
We present the design and concept of 3-dimensional (3-D) electromagnetic energy collection for microwave energy harvesting. We show that by vertically stacking panels of electromagnetic energy collectors, the power collected experiences a significant enhancement over a single 2-D panel. Here, we present an example of…
A circularly symmetric high impedance surface is used as ground plane for spiral antennas. It is shown through simulations that a circular high impedance surface exhibits a wider operational bandwidth when used as ground plane for this type of radiators compared to loop antennas.