UWB Antennas Analysis Using FDTD-Based Discrete Green's Function Approach

Mirhadi, Salma; Soleimani, Mohammad; Abdolali, Ali

doi:10.1109/lawp.2013.2280611

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…The dyadic finite-difference time-domain (FDTD) compatible Green's functions, referred to as the discrete Green's functions (DGFs), were proposed in infinite free space initially [1]. The DGFs were then applied to analysis of antennas with the aim of avoiding the need for absorbing boundary conditions and calculation of free space nodes around them [2][3][4][5]. Recently, the DGFs in multilayered media have been derived based on the finite-difference scheme of time-domain mixed-potential equations [6].…”

Section: Introductionmentioning

confidence: 99%

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Ultra wideband antenna design using discrete Green's functions in conjunction with binary particle swarm optimisation

Mirhadi¹,

Komjani²,

Soleimani³

2016

IET Microwaves, Antennas & Propagation

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The binary particle swarm optimisation (BPSO) in conjunction with the time‐domain discrete Green's function (DGF) method is proposed for designing of printed ultra wideband (UWB) antennas. In the DGF method, on one hand, a three‐dimensional problem is reduced to a two‐dimensional one, and on the other hand, the broadband frequency characteristics of the antenna are achieved with a single simulation run. Furthermore, the spatial discrete representation of the current on the antenna, in the DGF method, facilitates implementation of its combination with the BPSO algorithm. Two different UWB antennas are designed using the proposed approach. First, an antenna is designed to minimise voltage standing wave ratio (VSWR). The experimental result shows that the antenna has a VSWR about <1.5 over the UWB range. Second, an antenna is designed to have not only low VSWR, but also stable radiation pattern over the UWB range. The experimental results show a good impedance matching and stable omnidirectional pattern over the UWB range.

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Section: Introductionmentioning

confidence: 99%

“…The combination of the PSO algorithm and the DGF simulator has the advantages of the both FDTD and MoM simulators. In other words, on one hand, since the DGF simulation is in the time-domain such as FDTD method, the broadband frequency characteristics are obtained through a single simulation run [3,5].…”

Section: Introductionmentioning

confidence: 99%

Ultra wideband antenna design using discrete Green's functions in conjunction with binary particle swarm optimisation

Mirhadi¹,

Komjani²,

Soleimani³

2016

IET Microwaves, Antennas & Propagation

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show abstract

“…Recently, it was noticed that the consideration of nonzero constant values of the DGF waveforms out of the window (i.e., steady-state values) improves the accuracy of the DGF-FDTD computations [9]. An approximation of dyadic DGF can be obtained from scalar DGF by the truncation of scalar DGF when this function approaches zero (i.e., the steady state).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the accuracy of the DGF approximation in the DGF-FDTD simulations can be well controlled by increasing the length of scalar DGF and applying the window to this function. This idea was already employed in the DGF-FDTD computations [9] with the use of the DGF formulation based on scalar DGF [1], [4] and the rectangular window applied to scalar DGF.…”

Section: Introductionmentioning

confidence: 99%

A New Expression for the 3-D Dyadic FDTD-Compatible Green's Function Based on Multidimensional Z-Transform

Stefański

2015

Antennas Wirel. Propag. Lett.

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In this letter, a new analytic expression for the time-domain discrete Green's function (DGF) is derived for the 3-D finite-difference time-domain (FDTD) grid. The derivation employs the multidimensional Z-transform and the impulse response of the discretized scalar wave equation (i.e., scalar DGF). The derived DGF expression involves elementary functions only and requires the implementation of a single function in the multiple-precision arithmetic. For its verification, antennas were simulated in the DGF formulation of the FDTD method with the use of the derived expression demonstrating the correctness of the derivation.

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“…Advantages of the DGF applications in the FDTD method have already been noticed and reported in the literature. The demonstrated DGF applications include disjoint‐domain FDTD simulations , hybridization of the FDTD method , implementation of nonlocal absorbing boundary condition (ABC) for the FDTD method , and DGF‐FDTD antenna simulations .…”

Section: Introductionmentioning

confidence: 99%

Application of the discrete Green's function-based antenna simulations for excitation of the total-field/scattered-field interface in the FDTD method

Stefański

2014

Microw. Opt. Technol. Lett.

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In this article, the discrete Green's function formulation of the finite‐difference time‐domain (DGF‐FDTD) method is proposed for simulation of wire antennas irradiating inhomogeneous dielectric scatterers. Surface equivalence theorem in the discrete domain is used to separate the problem into an inhomogeneous domain and a wire antenna that are simulated with the use of FDTD and DGF‐FDTD, respectively. Then, the excitation of the total‐field/scattered‐field (TFSF) interface within the FDTD domain is computed as a convolution of antenna currents with DGF. Such a radiation is compatible with the grid and can excite the FDTD domain without the erroneous field leakage across the TFSF interface. The developed method is illustrated by canonical problems involving wire antennas that irradiate scatterers. If the DGF length is equal to the number of iterations in a simulation, the developed method perfectly introduces irradiation from wire antennas into the TFSF FDTD domain (assuming infinite numerical precision of computations). © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1949–1953, 2014

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UWB Antennas Analysis Using FDTD-Based Discrete Green's Function Approach

Cited by 7 publications

References 13 publications

Ultra wideband antenna design using discrete Green's functions in conjunction with binary particle swarm optimisation

Ultra wideband antenna design using discrete Green's functions in conjunction with binary particle swarm optimisation

A New Expression for the 3-D Dyadic FDTD-Compatible Green's Function Based on Multidimensional Z-Transform

Application of the discrete Green's function-based antenna simulations for excitation of the total-field/scattered-field interface in the FDTD method

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