This communication presents the design and experimental verification of a substrate integrated waveguide fed lens antenna for 79 GHz automotive radar applications. The proposed consists six layer cylindrical Luneburg illuminated by 17 source elements planar log periodic dipole array. is developed using unique foam material AirexR82 (ε <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> = 1.12), which drilled pressed to achieve different...

Terahertz (THz) links will play a major role in high data rate communication over distance of few meters. In order to achieve this task, antenna designs with gain and wideband characteristics spearhead these links. contribution, we present different that offer better suited THz short distances. Firstly, single-element having dipole reflector is designed operate at 300 GHz, which considered as sub-terahertz band. That achieves wide impedance bandwidth 38.6% from 294 GHz 410 5.14 dBi....

Numerical analysis of Dyakonov waves generation has been carried out at uniaxial chiral-plasma planar interface. The extended electromagnetic wave theory is utilized, and an impedance boundary conditions approach employed to obtain characteristics equation. Effective mode index attenuation under the different values collisional frequency, plasma frequency chirality in THz range for three cases chiral media are discussed. These results can be used field photonics integrated optics fabricate...

This paper proposes a new mobile handset antenna structure to reduce the value of specific absorption rate (SAR).The is based on PIFA and operates at dual-bands 0.9 GHz 1.8 GHz.The chassis current reduced using metallic shim-layer inserted between patch chassis.This connected through posts whose number positions are determined optimization techniques.Sidewalls attached increase gain radiation towards human head.Simulations in cheek mode show that SAR reduction factor (SRF) proposed averaged...

This paper presents system modelling and characterization of multiple-band notched ultrawideband (UWB) antennas using the singularity expansion method (SEM). Multiple-band notches in a classical UWB coplanar disc monopole antenna are achieved by introducing systematic defection slots ground structure solely. The uses two dual-band meander ground-defects to create quadruple band avoid possible interference with pre-existing standard services. SEM an improved pole-residue extraction scheme is...

This paper presents a steady state analysis of three phase self-excited induction generator. The problem is formulated as multidimensional optimization problem. A constrained optimizer used to minimize cost function the total impedance or admittance circuit generator obtain frequency and other performance machine. Classic gradient optimizers are for this purpose "fmin" "constr" routines built in basic Matlab. Unlike reported methods analysis, same equation be solved irrespective unknown...

A novel compact dual-band reconfigurable square-ring microstrip antenna is presented. The tuning achieved using a single varactor diode connected to small square patch attached an inner corner of the square-ring. perturbs symmetry and splits two degenerate modes create operation. frequency ratio in range 1.04 1.4 can be by proper selection size. lower resonance further decreased loading at its reverse biased diode. has almost no effect on upper frequency. This technique used implement...

Two new triple band small size composite-resonator microstrip antenna configurations for wireless communications are presented in this paper.The proposed antennas, each is built of three resonant elements.Two types compact short-circuited resonators used; stepped impedance and quarter-wave resonators.The design procedure based on composing the straightforward can be applied to any at pre-specified bands using simple relations curves.The resonator integration has been performed maintain...

Theoretical investigations are carried out to study hybrid SPP wave propagation along the Chiral-Graphene-Metal (CGM) interface. The Kubo formulism is used for physical modeling of single-layer graphene and impedance boundary conditions approach applied at CGM interface compute dispersion relationship waves. It demonstrated that chirality (ξ) chemical potential (μc) parameters can be modulate resonance surface plasmon frequencies upper lower propagating modes. Furthermore, bandgap between...

A compact four-element dual-band multiple-input and multiple-output (MIMO) antenna system is proposed to achieve high isolation low channel capacity loss. The MIMO was designed optimized cover the dual-frequency bands; first frequency band a wide band, it covers range of 1550–2650 MHz, while other 3350–3650 MHz range. measured wide-band impedance bandwidths 1.1 GHz 300 were achieved in lower upper bands, respectively. structure consists four novel elements, along with plus-sign-shaped ground...

Abstract Polaritonic interactions are pivotal in advancing sensing technologies, optical devices, and waveguides. This study presents a theoretical investigation into polaritonic at the interface of chiral-loaded temperature-sensitive materials (TSMs). Indium antimonide (InSb), known for its temperature-dependent phase-transition properties, is utilized as TSM. The electromagnetic (EM) behavior InSb described using extended Drude model, while isotropic chiral medium characterized through...

Abstract In this research work, the fiber modes supported by graphene-wrapped indium antimonide nanowire have been examined theoretically. The (InSb) is a semiconductor material, which has temperature-sensitive optoelectronic properties. To model of InSb, Drude’s used for better results. Kubo’s formalism based on random phase approximation modeling graphene. impedance boundary conditions (IBCs) are to compute characteristic equations. real and imaginary part permittivity InSb as function THz...

Abstract This article presents the design of a 60 GHz beam-scanning antenna system with coverage range 50–100 m for high-speed indoor communication systems. The incorporates techniques to meet requirements while minimizing cost and size. comprises substrate-integrated waveguide stable operation, printed log periodic dipole array operating at 10 bandwidth (54–67 GHz), which provides 6.99 dB directivity. Adding vertically stacked double Luneburg lens improves pattern performance increases...

In this paper, guided modes in isotropic chiral nihility metamaterial fibers coated with graphene layers supported by conventional dielectric material are studied theoretically. Kubo formalism is applied to model the conductivity of single-layer graphene, and suitable boundary conditions at proposed waveguide structure. The dispersion equation for fiber normalized cut-off frequency derived. Characteristic curves forward backward modes, effect layer, influence chirality parameter, energy flow...

This paper presents novel low-cost single- and dual-band microstrip patch antennas. The proposed antennas are realized on a square etched symmetrically with four slots. antenna is designed to have low cost reduced size use in Internet of things (IoT) applications. provide reconfigurable architecture that allows operation different wireless communication bands. structure can be adjusted operate either single band or operation. Two prototypes implemented evaluated. first works at resonance...

A simple moment solution is presented to the problem of electromagnetic scattering from a homogeneous chiral cylinder arbitrary cross-section. The assumed be illuminated by either TE or TM wave. surface equivalence principle used replace equivalent and magnetic-surface currents. These currents radiating in unbounded external medium produce correct scattered field outside. When an medium, they total internal field. By enforcing continuity tangential components electric on cylinder, set...

This paper presents a new structure to implement compact bandstop filters by employing coupled DGS resonators etched in the ground plane. The proposed filter consists of symmetrical with microstrip excitation obtain response. By adjusting space S between two resonators, bandwidth can be easily controlled. A is designed, analyzed and implemented on FR4 dielectric substrate operate at 2 GHz. measured results are good agreement simulations.