In this letter, a microstrip Stepped Impedance Resonator (SIR) bandpass filter (BPF) based on Composite Right/Left-Handed (CRLH) transmission lines is presented for the first time. Supported by theory, full-wave simulations and measurements, operational principle of explained results are analysed. Also, comparison made between its conventional right-handed (RH) counterpart. For same centre frequency, fractional bandwidth stop-band attenuation, CRLH SIR BPF here proves to surpass counterpart...

This article presents the design of a microwave multisection combined Gysel-Wilkinson (MSCGW) power divider (PD) with arbitrary division ratios, wide bandwidth (BW), and high power-handling capability (PHC). Exact formulas for N-section PD are derived in form closed-form equations through even- odd-mode analysis. In addition to novelty structure itself, straightforward approach is presented based on known analytical techniques offer guaranteed optimum design. The validated theoretically,...

Abstract The discretization, parallelization and performance of an implicit, unstructured, time‐dependent Computational Fluid Dynamics code is described. A detailed description provided the improvements made on second‐order accurate tools for spatial interpolation gradient calculation to discretize Navier–Stokes equations in unstructured framework. main goal development discretization was ensure a scalable parallel code. has been validated using standard bench‐mark problems non‐uniform,...

To investigate the feasibility of use foams with an interconnected spherical pore structure in heat transfer applications, models for and pressure drop this type porous materials are developed. Numerical simulations carried out laminar multidirectional thermofluid flow idealized geometry a wide range parameters. Semiheuristic developed from results simulations. A simplified solid-body drag equation extended high inertia term is used to develop hydraulic model. model nonzero asymptotic very...

This paper presents a novel compact planar dual-band spurious-free antenna based on metamaterial stepped-impedance resonators. The provides the capability of controlling both frequency bands, while ensuring an extended stopband. is designed to operate at UMTS and WLAN frequencies 2.1 GHz 2.4 GHz, respectively. dimensions are only 2 × cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , which 50%smaller compared conventional...

This paper presents a λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> /2 microstrip Stepped Impedance Resonator (SIR) based on Composite Right/Left-Handed (CRLH) transmission line for the first time. The SIR resonates at 2.1 GHz Wireless Local Area Network (WLAN) applications. Supported by theory and full-wave simulations, comparison is made between this design its conventional counterpart. CRLH presented in not only 44.76% smaller...

In this study, two-dimensional inviscid compressible flow is solved around a moving solid body using Immersed Boundary Method (IBM) on Cartesian grid.Translational motion handled with grid generated the which moves background grid.In IBM, boundaries are immersed within points.In paper solution domain discretized finite volume approach.To implement boundary conditions boundaries, set of Ghost volumes defined along wall boundaries.Boundary used to assign variables these volumes.Governing...

In this study, the implicit Crank–Nicolson finite-difference time-domain (CN-FDTD) method is applied to discretize governing telegrapher's equations of a composite right-/left-handed (CRLH) coupled-line coupler. The unconditionally stable CN-FDTD compared with conventional leap-frog (LF) FDTD method. results obtained from scheme show up 10 times increase in temporal step size, reflecting dramatic decrease processing time; addition having good agreement LF and measurements.

A compact GPS antenna has been designed and printed on a flexible polyimide substrate for integration into wearable devices. The design incorporates planar dipole structure with optimised geometry to minimise volume maximise surface current distribution. simulated measured in open space human wrist model; giving consistent results as presented. antenna, dimensions of 40mm×25mm (80% smaller than wire the same characteristics) is mechanically robust device capable working inside textile/nylon...

Abstract Liquid velocity and gas holdup were measured in a 690L pilot‐scale rectangular airlift contactor, divided into aerated nonaerated sections by two vertical polyester textile membranes. Horizontal flow through the porous membranes complicates fields to such an extent that conventional models cannot predict thoroughly profile contactor. Experimental data obtained from laser doppler velocimetry (LDV) method compared with numerical finite volume (FVM), order determine downcomer zone of...

In this paper, a novel microstrip Tri-section Stepped Impedance Resonator (TSIR) based on Composite Right/Left-Handed (CRLH) transmission line is presented to resonate at the fundamental frequency of 2.5 GHz for Wireless Local Area Network (WLAN) applications. The left-handed TSIR utilised relocate multiple resonance frequencies while maintaining same. Supported by theory and full-wave simulations, comparison made between design its conventional counterpart. CRLH SIR in paper not only 30%...

In this paper, a balanced-to-balanced series feeding (BBSF) network with common-mode suppression is proposed. Design requirements of the BBSF extracted at 2GHz, and constraining rules mixed-mode S-parameters are expressed by using matrix transformation. proposed structure, in order to obtain an in-phase power division, balanced input signal fed from one side into loads, transmission lines (TLs) length guided-wavelength (λg). Furthermore, microstrip crossover used avoid use multilayer PCB...

Abstract An isolated low-profile multilayer all-ports-matched broadside-coupled balun (BCB) with arbitrary isolation bandwidth is presented. Analytical relations are derived and provided for the circuit (IC) design in terms of electrical physical parameters. Accordingly, instructions given on obtaining optimum responses IC. Design procedure BCB presented together a case study power amplifier application. The validated theoretically, analytically, experimentally, results good agreement....

This research paper introduces a non-invasive approach for detecting and treating thrombosis through the use of ultrasonic waves to address blood clotting within vessels. Thrombosis, characterised by restricted flow due clot formation, represents significant contributor conditions such as stroke heart attacks. It is worth noting that in 2019, an estimated number 17.9 million people died from Cardiovascular Diseases (CVDs), constituting approximately 32% all global fatalities. Of this...

As individuals age, the likelihood of developing anaemia increases, often stemming from conditions such as iron deficiency. While in elderly may seem relatively common, research indicates that it poses significant physical risks for this demographic. Iron deficiency, a common cause older adults, is particularly prevalent among who consume limited amounts iron-rich foods, vegetarians. Additionally, chronic bleeding associated with like stomach ulcers or kidney issues can intensify elderly. To...

This paper presents a procedural approach for utilizing ultra-subwavelength rectangular chiral particles embedded in the substrate to eliminate spurious response of coupled transmission lines by equalizing even and odd mode phase velocities large bandwidth, making it applicable wideband coupled-line based structures. Even velocities, is equalized with BW 4 GHz, spanning range 0.5–4.5 normalized velocity Root Mean Square Error less than 0.005.

In this letter, a new method is presented for synthesis of an artificial reflective surface with linear reflection coefficient phase and controllable slope over wide frequency band. To end, circuit model introduced based on the theory continued fractions expansion. The resonant elements are then designed according to model, provide slope. These realized through dogbone-type configuration operate in X-band. coefficients fabricated measured using waveguide method; good agreement simulation...

In this paper an optimized, simple and quick approach for design of three-section Wilkinson power divider is proposed. This has been validated through extensive theoretical, numerical experimental analysis the case 2-6GHz with 110% fractional bandwidth a return loss isolation reference level -20dB, insertion 0.5dB (inclusive SMA losses). The procedure includes only two first order (linear) equations, guarantees optimized first-time response in terms wide bandwidth, optimum input output loss,...

This paper proposes an accurate, simple, and versatile approach for calculation of the off-axis magnetic field any axisymmetric cylindrical current distribution, eliminating need complicated elliptical integrals sophisticated numerical methods, e.g., finite element method. The results obtained from both integral series forms not only confirm validity proposed method against well-established analytical techniques but also outperform them in terms accuracy, simplicity, time. yields greater...

In this paper, an accurate design of a wideband reflectarray (RA) antenna is presented. The radiating elements the are designed based on True Time Delay (TTD) technique. A new circuit model presented to realize linear reflection coefficient phase resonant elements, and accordingly, these implemented through multilayer Frequency Selective Surface (FSS) structures. prototype proposed RA fabricated, which proves offer stable aperture efficiency about 80% maximum possible gain throughout X-band...