International Journal of Applied Electromagnetics and Mechanics - Volume 29, issue 3-4

Authors: Tellache, Mohamed | Lamhene, Youcef | Haraoubia, Brahim | Baudrand, Henri

Article Type: Research Article

Abstract: In the present work, the modeling of high frequencies planar circuits is proposed with an original iterative method based on the concept of waves. It consists in the development of simulation software based on an iterative method. The iterative method is developed from the fast modal transform on a two-dimensional fast Fourier transform algorithm. The method has been applied to the characterization and the modeling of patch antennas with notches in microstrip and coplanar technology and …the quarter wavelength directive coupler. The obtained results are very satisfactory particularly in the reduction of the simulation time and the precision of the results in comparison with the literature. Show more

Keywords: Iterative method, modeling, planar circuits, coplanar circuits, microwaves, patch antennas, quarter wavelength directive coupler

DOI: 10.3233/JAE-2009-1007

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 29, no. 3-4, pp. 131-143, 2009

Authors: Xu, Limei | Geng, Yunlong | Zhang, Ying | Fan, Hui

Article Type: Research Article

Abstract: Recently thickness vibrations of an unbounded elastic plate with an unbounded piezoelectric actuator and an unbounded piezoelectric power harvester have been studied for power transmission through an elastic wall with various potential applications. In this paper we analyze the more realistic geometric configuration of a structure with finite piezoelectric transducers on unbounded plates operating with slowly varying thickness modes via the first-order lamination theory for plates. In addition to the output voltage and transmitted …power, confinement and localization of the vibration energy is also studied which is of practical importance and can only be understood from analyzing vibrations of finite transducers. Show more

Keywords: Plate, vibration, piezoelectricity

DOI: 10.3233/JAE-2009-1009

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 29, no. 3-4, pp. 145-156, 2009

Authors: Abo-Seida, Osama M.

Article Type: Research Article

Abstract: The propagation of electromagnetic waves in a circular tunnel being studied, as far as his walls are made of concrete, its conductivity coefficient would be in the range 10^{-1} –10^{-2} mho/m. The cutoff frequency was also calculated and three different types of frequency range were characterized. Each of the frequency range is characterized, in turn, by certain propagation modes which differ in the cases of transverse electric modes (TE_{mn} – modes) …and transverse magnetic modes (TM_{mn} – modes), (m, n = 0, 1). Besides, the attenuation constant was calculated at values larger and smaller than that of the cutoff frequency for both the transverse electric waves and transverse magnetic waves. Numerical results and graphes are also given for different values of m and n (m, n = 0 or 1) and a range of selected frequencies between 20–300 MHz. Show more

DOI: 10.3233/JAE-2009-1010

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 29, no. 3-4, pp. 157-161, 2009

Authors: Zhou, Zhen-Gong | Wang, Jia-Zhi | Wu, Lin-Zhi

Article Type: Research Article

Abstract: In this paper, the behavior of two parallel non-symmetric interface cracks in a magneto-electro-elastic material strip subjected to a uniform anti-plane shear stress loading was studied using Schmidt method. The problem was formulated through Fourier transform into two pairs of dual integral equations, in which the unknown variables are jumps of displacements across crack surfaces. To solve the dual integral equations, the jumps of displacements across crack surfaces were directly expanded as a series of …Jacobi polynomials. Finally, the relations among the electric filed, the magnetic flux field and the stress field were obtained. The solution of the present paper shows the effect of the distance between two parallel cracks, the thickness of the layers and the level distance between two center points of two parallel non-symmetric cracks upon the stress, electric displacement and magnetic flux intensity factors at crack tips. It is also revealed that the crack shielding effect presents in magneto-electro-elastic materials. Show more

Keywords: Magneto-electro-elastic materials, parallel non-symmetric interface crack

DOI: 10.3233/JAE-2009-1011

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 29, no. 3-4, pp. 163-184, 2009

Authors: Duyar, Mehmet | Akan, Volkan | Yazgan, Erdem | Bayrak, Mehmet

Article Type: Research Article

Abstract: In this paper, new and fast analytical formulations have been presented for conductor loss calculations of elliptical (ECPW) and cylindrical coplanar waveguide (CCPW) with finite conductor thickness. These expressions are derived using conformal mapping techniques (CMT) and the validity of them is established by comparing the numerical results in the literature. These comparisons indicate that for the same conductor thickness the conductor losses of elliptical and cylindrical coplanar waveguide are higher than the conductor …losses of coplanar waveguide presented in [1]. Calculation method developed in this study is an extension of the approximate technique proposed by Ghione [1]. Show more

Keywords: Conformal mapping, elliptical coplanar waveguide, cylindrical coplanar waveguide, conductor loss, attenuation

DOI: 10.3233/JAE-2009-1013

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 29, no. 3-4, pp. 185-195, 2009

Authors: Veryaskin, Alexey V.

Article Type: Research Article

Abstract: A quantitative theory of operation of a novel device, namely Direct String Magnetic Gradiometer (DSMG), is presented. The paper provides a detailed analysis of DSMG basic functions and measured quantities, represented in terms of physical parameters that are known either a priori or can be experimentally determined. It leaves a reasonable degree of freedom to further investigate some of the finer detail of this new instrument based on experimental results coming both from the laboratory environment …and from field trials. The analysis also allows us to quantitatively evaluate the error budget for an optimised DSMG. Show more

Keywords: Magnetic gradiometer, feedback

DOI: 10.3233/JAE-2009-1014

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 29, no. 3-4, pp. 197-215, 2009