J. Jin and J.L. Volakis, "A hybrid finite element method for scattering and radiation by microstrip patch antennas and arrays residing in a cavity," IEEE Trans. Antennas Propagat., vol. 39, no. 11, pp. 1598-1604, November 1991.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....of problems due to their ability to handle arbitrary shape of the cavity and complex materials that may be required for the antenna design. The combined Finite Element Method (FEM) and Method of Moments (MoM) technique in particular has been used to analyze various cavitybacked aperture antennas[1,2]. In the combined FEM MoM technique, FEM is used in the cavity volume to compute the electric field, whereas MoM is used to compute the magnetic current at the aperture. Using Galerkin s technique, an integro partial differential equation is formed. The cavity is divided into tetrahedral elements ....

....electric field satisfies the vector wave equation: 1) where , are the relative permeability and relative permittivity of the medium in the cavity. The time variation is assumed and suppressed throughout this report. Applying the Galerkin s technique, equation (1) can be written in weak form as [1] = 2) where is the vector testing function, is the aperture surface, and is the input surface (see fig. 1) is the magnetic field at the aperture and is the magnetic field at the input surface. In accordance with the equivalence principle [9] the fields inside the cavity can be decoupled to the ....

J. M. Jin and J. L. Volakis, "A hybrid finite element method for scattering and radiation by microstrip patch antennas and arrays residing in a cavity," IEEE Trans. Antennas and Propagation, Vol.39, pp.1598-1604, November 1991.

....of problems due to their ability to handle arbitrary shape of the cavity and complex materials that may be required for the antenna design. The combined Finite Element Method (FEM) and Method of Moments (MoM) technique in particular has been used to analyze various cavity backed aperture antennas[1,2]. In the combined FEM MoM technique, FEM is used in the cavity volume to compute the electric field, whereas MoM is used to compute the magnetic current at the aperture. Using Galerkin s technique and forming simultaneous equations, the electric field is solved. For the combined FEM MoM technique, ....

J. M. Jin and J. L. Volakis, "A hybrid finite element method for scattering and radiation by microstrip patch antennas and arrays residing in a cavity," IEEE Trans. Antennas and Propagation, Vol.39, pp.1598-1604, November 1991.

....Drive, Hampton VA 23681, USA. 3. C.R.Cockrell and F.B.Beck are with NASA Langley Research Center, Mail Stop 490, Hampton VA 23681, USA. 2 1. INTRODUCTION: Cavity backed aperture antennas are useful in aerospace applications due to their nature to be conformal to the surface of the host object[1]. To predict the input impedance and radiation pattern of these types of antennas, one may use the Method of Moments. However, application of MoM to these problems result in full dense matrix and hence for complex cavity structure MoM will require prohibitively large computer storage and CPU time. ....

....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 modelling in [1] is expected to give good results for shallow 3 cavities. However, for deep cavities rigorous feed modelling is required. In this ....

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J.M.Jin and J.L.Volakis, "A hybrid finite element method for scattering and radiation by microstrip antennas and arrays residing in a cavity," IEEE Trans. Antennas and Propagation, Vol.AP-39, pp.1598-1604, Nov. 1991.

....y M M x M y M x M x M y M y N n Q D r q f , S 1 S 2 s s T 1 T 2 u y 5 1. Introduction Conformal antennas such as cavity backed aperture antennas are very popular in the aerospace community. These antennas have been analyzed using a number of different techniques[1,2]. The techniques used in these papers include Finite Element Method (FEM) Method of Moments (MoM) and Geometrical Theory of Diffraction (GTD) In a recent publication, GTD was included to account for the finite termination of a ground plane[2] The diffraction effects in that paper were accounted ....

.... y ( 2n cot F s k o s g y y ( p y y ( 2n cot F s k o s g y y ( 9 field at the diffraction point Q D due to the magnetic current, at the aperture and is given as[1]: 18) 19) where (20) and (21) 22) 23) From figure 1, it may be noted that at the diffraction point Q D , In equations (18) and (19) image theory is used to account for the aperture in an infinite ground plane. In terms of the field variable q, the slope of the incident magnetic field is ....

J.M.Jin and J.L.Volakis, "A hybrid finite element method for scattering and radiation by microstrip antennas and arrays residing in a cavity," IEEE Trans. Antennas and Propagation, Vol.AP-39, pp.1598-1604, Nov. 1991.

....and around the microstrip antenna, thus lowering the effective dielectric constant. Several patch antennas have been fabricated based on micromaching techniques and bandwidth improvement for these antennas has been observed [4] In this paper, a finite element boundary integral (FE BI) method [5] is used to model such a cavity backed patch antenna with perforated substrate. The synthesized dielectric constant e rsynth for the PBG region is proportional to the volume of the removed substrate, and the high index material surrounding the PBG has a dielectric constant e r . Therefore, the ....

J. Jin and J.L. Volakis, "A hybrid finite element method for scattering and radiation by microstrip patch antennas and arrays residing in a cavity," IEEE Trans. Antennas Propagat., vol. 39, no. 11, pp. 1598-1604, November 1991.

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Jin, J. M.; and Volakis, J. L.: A Hybrid Finite Element Method for Scattering and Radiation by Microstrip Patch Antennas and Arrays Residing in a Cavity. IEEE Trans. Antennas & Propag., vol. 39, no. 11, Nov. 1991, pp. 1598--1604.

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