In this paper, we describe the essential elements of a parallel algorithm for FDTD method using MPI (message passing interface) library. To simplify and accelerate algorithm, an Cartesian 2D topology is used. The inter-process communications are optimized by use derived data types. A general approach also explained parallelizing auxiliary tools, such as far-field computation, thin-wire treatment, etc. For PMLs, have used new that makes it unnecessary to split field components. This...

Electromagnetic waves bearing orbital angular momentum in the radio frequency range is a growing subject of study. The design systems able to produce and/or receive such then crucial importance. aim this letter characterize, an anechoic chamber, new type antenna millimeter band. index-varying flat plate generates electromagnetic wave carrying momentum. We extract various modes from radiated field.

The design of an ‘orbital angular momentum (OAM) antenna’ based on original phase shifter and power divider combination at 2.5 GHz is presented. A prototype manufactured characterised return loss, radiation patterns. Both simulation experimental results evidence the properties waves carrying OAM. This OAM antenna simple, compact easy to realise, which makes it suitable for radio communications radar applications.

The design of two new horn antennas for the generation radio waves bearing orbital angular momentum (OAM) is presented. OAM mode ℓ = 1 or −1 generated by combining guided modes a circular waveguide with spiral phase plate. authors present here structures to generate wave based on TE11 and TM01 modes. resulting magnitude patterns electrical field radiation evidence presence carrying OAM.

A family of multiband metamaterial-inspired dipole antennas are reported. These based on a integrated in planar configuration with capacitively loaded loops (CLLs) as their near-field resonant parasitic (NFRP) elements. In the realized structures, number operating frequencies is determined by size CLLs and proximity to printed dipole. Simulation results explain design features demonstrate that structures present behavior. Three corresponding prototypes were fabricated tested. The measured...

We focus our attention on the possibilities to control beam radiated by antennas, which are initially omnidirectional using active metallic photonic band-gap materials (AMPBG). In fact, MPBG composed of continuous or discontinuous wires present different and interesting characteristics when they used as an antenna reflector a radome. Adding components allows one switch from structures. Wires with elements can then be placed inside structure, shapes dipole antenna. Experimental results show...

The broadband behaviour of a pair stacked triangular microstrip antennas is investigated experimentally. Recent experiments have shown that the bandwidth antenna (TMA) can be broadened to as high 17.5%.

The solution to the problem of scattering a plane wave by an infinite periodic array meander-line thin conductors on dielectric sheet is considered. Numerical results perpendicular and parallel polarization susceptances are given as well comparison with experimental data over large frequency range. Results showing variations array's respect constitutive parameters also presented.

A 12-element conical antenna array made of four linear subarrays regularly spaced by 90° is proposed in C-band for communication applications on high velocity flying platforms. The beam forming network stacked below the radiating part, and allows steering subarray array. performance main building blocks described detail, both numerically experimentally. measured radiation characteristics phased are good agreement with simulation results between 5 5.4 GHz all configurations pointing...

We study here a 12-element conical antenna array made of four linear subarrays angularly spaced by 90 ° and with three probe-fed radiating elements per subarray. A prototype has been designed manufactured. The measured radiation characteristics the elementary element (active pattern) subarray are found in good agreement simulation results. proposed configuration is considered as promising solution to rotate steer beam for ensuring point-to-point communication at 5.2 GHz.

The radiation of a point source above an infinite reflecting plane is analyzed. It allows us to set conditions on the reflection coefficient behavior in order obtain constructive interference between reflected and directly emitted waves. Then, metallic photonic bandgap material (MPBG) investigated determine its spectral region bandgaps coefficient. As it could satisfy phenomenon wide band, MPBG used as antenna reflector. At frequency within bandgap, analyzed function distance dipole MPBG. A...

A new structure based on a combination of two PRS (partially reflective surface) is introduced and studied analytically to improve the bandwidth FP EBG antennas. The original procedure developed here leads design method for broadening planar

Performance characteristics of Electrically Small Antennas are limited by fundamental physics. Using Non-Foster elements into antennas structures appears like an opportunity to overshoot those limits. In this paper, a Negative Impedance Converter circuit is designed for antenna applications at 868 MHz. These active circuits, that produce negative capacitance or inductance, known as sensitive circuits due their nonlinearities can instabilities. Thus, designing Converters Ultra High Frequency...

This letter presents an innovative circularly polarized compact cavity antenna based on metasurfaces; the proposed design is explained starting from a linearly similar concepts. The main objective to cover three different GNSS systems, namely Galileo E1, GLONASS G1, and GPS L1, with single embedded in metallic cavity. aperture dimension set 0.26λ0 × 0.26λ0, central frequency of 1578 MHz. Loading metasurface allows efficient radiation within such small size. Our experimental results are very...

A class of metamaterial-inspired antennas having reconfigurable radiation patterns is proposed. They consist a driven monopole antenna with one- and two-capacitively loaded loop (CLL), near field resonant parasitic elements. Two configurations are studied by considering the state these CLL elements as being either open or closed configurations. Simulation results explain design features demonstrate that structure can change its beam direction simply controlling switched states. prototypes...

The circular phased antenna array is a common way to generate waves bearing Orbital Angular Momentum (OAM) in the radio frequency band, but directivity of this relatively low. To overcome drawback, paper, we use Fabry-Perot cavity enhance an OAM based on patch antennas. consists ground plane, air and partially reflecting surface (PRS) made metallic strips. Simulation results show that achieves 16.2 dB with enhancement 9.2 E H planes.

A new family of metamaterial-inspired monopole antennas is reported. Split-ring resonator (SRR) introduced into the near field region a antenna. Four configurations are proposed by changing position slot SRR. In each case, we obtain behavior and resonance frequency, in addition to that monopole. The results presented for return loss, efficiency, surface current radiation pattern. prototypes fabricated measured. Good agreement between numerical experimental demonstrated.

Original results on mutual coupling between two identical stacked microstrip antennas are presented. The theoretical results, calculated by using the reciprocity theorem and spectral domain method, in good agreement with experiments. structures is compared that unstacked patches.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A new hybrid type of configuration has been investigated to obtain wider bandwidth. In the proposed configuration, two parasitic resonators are directly coupled nonradiating edges a central patch through short sections micro-strip lines and third resonator is gap-coupled with its radiating edge.

In this work, a family of multifunctional metamaterial-inspired antennas are designed, realized and measured. The basic structure consists an inductor-loaded parasitic strip introduced into the near field region monopole antenna. Three studied by considering one, two three lumped inductors, respectively. Simulated measured results show that multi-inductor element has main effects on antenna properties: first, it generates new resonance frequencies second, enhances bandwidth first resonance.

A linear array of three half-wavelength dipoles above a metallic reflector is analyzed. The results are then compared with those the same different kind photonic bandgap materials. aim to find structure which allows greatest reduction grating lobes (GL). This can be obtained either by destructive interference in direction or using propagation inside MPBG, normal incidence only (main lobe), GL directions only. Then, an MPBG selected and completely analyzed (plane wave response, radiation...

The first textile monopole antenna design based on a zip at 2.5GHz is presented. Return loss and radiation pattern measurements are used to characterize manufactured prototype. obtained bandwidth characteristics make the proper be for WiFi applications in band from 2.4GHz 2.7GHz. In addition, this novel exhibits advantage of being easily tunable.

We present a novel way to generate waves bearing Orbital Angular Momentum (OAM) in circular waveguide by using two monopole antennas. The OAM mode ℓ = 1 is generated combination of the classical TM01 and TE21 modes waveguide. Two printed antennas are used create these modes. design procedure this "OAM antenna" presented. resulting electrical field distribution radiation phase patterns evidence properties OAM.

The purpose of this presentation is to propose a method design directive and matched antenna with planar electromagnetic band gap (EBG) structure. EBG structure our example consists metallic wires. This study uses the FDTD analytical formulas.

Physical limitations on bandwidth of aperture antennas backed by a small rectangular cavity are investigated here. To this purpose, theoretical bound maximum is studied using the scattering approach introduced Gustafsson et al. As was mainly applied to wire and metallic scatterers, we extend it validate formulation comparing analytical numerical results. We concentrate cavities in an infinite ground plane with dimensions smaller than half free-space wavelength.