J.M.Jin and J.L.Volakis, "A finite element-boundary integral formulation for scattering by three dimensional cavity backed apertures," IEEE Trans. Antennas and Propagation, vol.39, pp.97-104, Jan. 1991.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....are not suitable when the cavity is filled with inhomogeneous materials. In [13] a Finite Difference Time Domain (FDTD) method is applied for large structures. However, the method of FDTD sometimes results in inaccurate results due to differencing, staircasing and dispersion. Jin and Volakis [14] used a finite elementboundary integral formulation which employs the boundary integral equation (or Method of Moments MoM) to formulate the fields external to the cavity accurately. In the combined FEM MoM technique, FEM is used in the cavity volume to compute the electric field, whereas MoM is ....

....in the cavity and k is the free space wavenumber. The time variation is assumed and suppressed throughout this paper. The electric field is solved via hybrid FEM MoM technique assuming that cavity backed aperture is illuminated by a harmonic plane wave, Following the procedure described in [14], equation (1) can be written as (2) where T is the vector testing function. is the aperture surface (see figure 1) is the scattered magnetic field and at . The volume of the cavity is subdivided into small volume tetrahedral elements. The electric field is expressed in terms of the edge vector ....

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J.M.Jin and J.L.Volakis, "A finite element-boundary integral formulation for scattering by three dimensional cavity backed apertures," IEEE Trans. Antennas and Propagation, vol.39, pp.97-104, Jan. 1991.

....code written in FORTRAN 77 to compute the backscattering radar cross section of cavity backed apertures in infinite ground plane (fig. 1) 1 and slots in thick infinite ground plane (fig. 2) 2 . CBS3DS implements the hybrid Finite Element Method (FEM) and Method of Moments (MoM) techniques [1,2,3]. This code uses the tetrahedral elements, with vector edge basis functions for FEM in the volume of the cavity slot and the triangular elements with the basis functions similar to that described in [1] for MoM at the apertures. By virtue of FEM, this code can handle any arbitrarily shaped ....

....TEST CASES Test Case 1:Air filled rectangular cavity in an infinite ground plane. Example 1 in Section 4) a=0.7l, b=0.1l, c=1. 73l, q=40 o 0 20 40 60 80 40 30 20 10 0 10 0 20 40 60 80 40 30 20 10 0 10 0 20 40 60 80 40 30 20 10 0 10 CBS3DS s l 2 (dB) f (degrees) s EE s EH Ref [2] s s s s s 0 20 40 60 80 40 30 20 10 0 10 0 20 40 60 80 40 30 20 10 0 10 0 20 40 60 80 40 30 20 10 0 10 s l 2 (dB) f (degrees) s HH s HE CBS3DS n n n n n Ref [2] 18 Test Case 2:Air filled rectangular cavity in an infinite ground plane. figure 4) a=2.5 , b=0.25 , ....

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J.M.Jin and J.L.Volakis, "A finite element-boundary integral formulation for scattering by three dimensional cavity backed apertures," IEEE Trans. Antennas and Propagation, vol. 39, pp. 97-104, Jan. 1991.

....high frequency methods, the multiple wave bounces are usually accounted for by ray expansion method and ray tracing method [15] Even then, the inordinately large number of bounces in a cavity renders the use of ray tracing method difficult for simulating waves in a cavity. Several hybrid methods [16 18] have also been reported for this problem in which low frequency methods are combined with a high frequency method to solve for the scattering solution from the cavity alone. No interior exterior coupling was considered for these methods. In this paper, we propose an algorithm that applies the ....

J.-M. Jin and J. L. Volakis, "A finite element-boundary integral formulation for scattering by three-dimensional cavity-backed apertures," IEEE Trans. Antennas Propagat., vol. 39, no. 1, pp. 97-104, Jan. 1991.

....the accuracy of these approximate boundary conditions depends on specific problems, leading to results of unpredictable accuracy. To eliminate the disadvantages of MoM and FEM methods, a combined approach using FEM method inside the cavity and MoM outside the cavity has been proposed [3,4,5] by several authors. Using the combined FEM MoM techniques, the input impedances of cavity backed microstrip antennas have been calculated in [1] The modelling of coaxial feed in [1] is done by replacing the feed probe by a constant filament of current with a delta gap generator. The feed ....

....The electric field inside the cavity satisfies the vector wave equation (1) where , are the relative permeability and relative permittivity of the medium in the cavity. The electric field is solved via hybrid FEM MoM technique assuming an infinite ground plane. Following the procedure described in [1,3], equation (1) can be written as (2) where is the aperture surface in the infinite ground plane and is the common surface between input feed line and the cavity as shown in figure 1. is the magnetic field over the aperture and is the magnetic field over the surface . is the vector testing ....

J.M.Jin and J.L. Volakis, "A finite element-boundary integral formulation for scattering by three dimensional cavity backed apertures," IEEE Trans. Antennas and Propagation, Vol.AP-39, pp.97-104, Jan. 1991.

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Jin, J. M.; and Volakis, J. L.: A Finite Element-Boundary Integral Formulation for Scattering by Three-Dimensional Cavity-Backed Apertures. IEEE Trans. Antennas & Propag., vol. 39, no. 1, Jan. 1991, pp. 97--104.

No context found.

J. M. Jin, and J. L. Volakis, " A finite element boundary integral formulation for scattering by three dimensional cavity backed apertures," IEEE Trans.. on Antennas and Propagation, Vol. AP-39, Jan. 1991. 37

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J. M. Jin, and J. L. Volakis, " A finite element boundary integral formulation for scattering by three dimensional cavity backed apertures," IEEE Trans.. on Antennas and Propagation, Vol. AP-39, Jan. 1991. 37

No context found.

Jin, Jian-Ming; and Volakis, John L.: A Finite-Element-Boundary Integral Formulation for Scattering by ThreeDimensional Cavity-Backed Apertures. IEEE Trans. Antennas & Propag., vol. 39, Jan. 1991, pp. 97--104.

No context found.

Jin, J. M.; and Volakis, J. L.: A Finite Element-Boundary Integral Formulation for Scattering by Three-Dimensional Cavity-Backed Apertures. IEEE Trans. Antennas & Propag., vol. 39, no. 1, Jan. 1991, pp. 97--104.

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