Transient Analysis of Wire Structures Using Time Domain Integral Equation Method With Exact Matrix Elements

Zhang, Guai-Hong; Xia, Mingyao; Jiang, Xiaomin

doi:10.2528/pier09032003

Cited by 29 publications

(20 citation statements)

References 26 publications

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“…Although these resonators or other modified versions of them such as hexagonal [2][3][4] and spiral resonators [5,6] have been used to realize canonical [7][8][9][10][11][12][13], dual [14][15][16][17][18][19][20][21], triple [22,23] and quadpassband filters [24] with complicated transmission characteristics, all of these filters suffer from the time consuming full-wave-based process of determining the physical parameters of the filter from the desired coupling factor and Q ext . The ability of soft computing techniques in modeling complicated problems in a vanishingly short time instead of using numerical or analytical approach [25][26][27][28][29][30][31][32] may provide a fast and accurate solution to this problem. Among the soft computing techniques the ability of fuzzy inference method in solving complicated electromagnetic problems such as microwave filter tuning [33,34], EMC problems [35], resonant frequency computation [36,37], determination of the transmission lines characteristic parameters [38], determination of the relative magnetic permeability [39] and also antenna modeling [40][41]…”

Section: Introductionmentioning

confidence: 99%

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Rezaee¹,

Tayarani²,

Knöchel³

2011

PIER

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Abstract-In the final step of any filter design process, the desired center frequency, coupling factor and external quality factor (Q ext ) are used to determine the physical parameters of the filter. Although in the most cases the physical dimensions of a single resonator for a given center frequency are determined using exact analytical or simple approximate equations, usually such simple equations cannot be found to easily relate the required coupling factor and Q ext to the physical parameters of the filter. Analytical calculation of coupling factor and Q ext versus dimensions are usually complicated due to the geometrical complexities or in some cases such as microstrip resonators due to the lack of exact solution for the field distribution. Therefore coupling factor and Q ext of various kinds of resonators, especially microstrip resonators, are related to the physical parameters of the structure by the use of time consuming full wave simulations. In this paper a surprisingly fast and completely general approach based on a soft computing pattern-based processing technique, called active learning method (ALM) is proposed to overcome the time consuming process of coupling factor and Q ext determination. At first the ALM technique and the steps of modeling are generally described, then as an example and in order to show the ability of the method this modeling approach is implemented to model the coupling factor and Q ext surfaces of microstrip open-loop resonators versus physical parameters of the structure. Using the ALM-based extracted surfaces for coupling factor and Q ext , two four pole Chebychev bandpass filters are designed and fabricated. Good agreement between the measured and simulated results validates the accuracy of the proposed approach.

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Section: Introductionmentioning

confidence: 99%

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Rezaee¹,

Tayarani²,

Knöchel³

2011

PIER

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“…In fact, several approaches have been applied to this important and challenging task such as Finite difference Time Domain (FDTD) method and Time Domain Integral Equation (TDIE) method. Many researches [4,5] have proven the effectiveness of TDIE compared to FDTD for transient analysis. So, the TDIE uses fewer unknowns based on surface discretization and eliminates the artificial absorbing conditions (ABC).…”

Section: Introductionmentioning

confidence: 99%

Transient Analysis of a Rectangular Cavity Containing an Interior Scatterer Using Td-Efie With Weighted Laguerre Polynomials as Temporal Basis Functions

Omri¹,

Aguili²

2014

PIER M

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Abstract-Novel 2-D Time Domain Electric FieldIntegral Equations (TD-EFIE) are established in order to predict transient response of a wire enclosed within a rectangular cavity. The wire and cavity are excited by an external incident transient electromagnetic wave through a slot in the cavity wall. The formulation of the TD-EFIE is based on equivalence principle and boundary conditions taking account the effect of reflection from cavity walls. The equations are efficiently solved by Method of Moments. The transient unknown coefficients of the electric current at the wire and magnetic current at the slot are approximated using a set of orthonormal temporal basis functions derived from Laguerre Polynomials. The analysis demonstration is presented to prove that the novel TD-EFIE combined to MoM is able to solve this critical problem. No late-time instability is encountered.

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“…There are numerous applications of these studies in antenna theory and propagation, as well as in electromagnetic compatibility (EMC), such as buried power and telecommunication cables, respectively, grounding, target identification, stimulation of biological tissue, etc. [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Time Domain Analytical Modeling of a Straight Thin Wire Buried in a Lossy Medium

Šesnić¹,

Poljak²,

Tkachenko³

2011

PIER

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Abstract-This paper deals with an analytical solution of the time domain Pocklington equation for a straight thin wire of finite length, buried in a lossy half-space and excited via the electromagnetic pulse (EMP) excitation. Presence of the earth-air interface is taken into account via the simplified reflection coefficient arising from the Modified Image Theory (MIT). The analytical solution is carried out using the Laplace transform and the Cauchy residue theorem. The EMP excitation is treated via numerical convolution. The obtained analytical results are compared to those calculated using the numerical solution of the frequency domain Pocklington equation combined with the Inverse Fast Fourier Transform (IFFT).

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Transient Analysis of Wire Structures Using Time Domain Integral Equation Method With Exact Matrix Elements

Cited by 29 publications

References 26 publications

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Transient Analysis of a Rectangular Cavity Containing an Interior Scatterer Using Td-Efie With Weighted Laguerre Polynomials as Temporal Basis Functions

Time Domain Analytical Modeling of a Straight Thin Wire Buried in a Lossy Medium

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