Showing papers by "Qaisar Abbas Naqvi published in 2000"
36 citations
TL;DR: In this paper, fractional dual solutions to the Maxwell equations in a biisotropic medium were investigated using field decomposition approach. And it was found that for homogeneous bi-isotropic media fractional-dual solutions can be obtained using field-decomposition approach and their behavior was noted.
27 citations
TL;DR: The purpose of this communication is to point out multiple errors in a previously published work and to present the erroneous parts of the work in an error free form so that interested readers can easily understand Hongo and Hamamura's important work.
24 citations
TL;DR: In this article, the far-zone scattered fields from a perfectly conducting, circular cylinder, which is deeply buried in a dielectric half-space, are evaluated using an approximate induced current distribution.
Abstract: Utilizing an approximate induced current distribution, the far-zone scattered fields from a perfectly conducting, circular cylinder, which is deeply buried in a dielectric half-space are evaluated....
23 citations
TL;DR: In this article, a cylindrical object of arbitrary cross-section which is buried in a geometry with parallel plane interfaces is studied and a far zone scattered field expression is derived in a general form which contain two terms.
Abstract: Scattering of plane electromagnetic waves from a cylindrical object of arbitrary cross-section which is buried in a geometry with parallel plane interfaces is studied. Far-zone scattered field expression is derived in a general form which contain two terms. Each term of this general form contains two factors. One factor depends only on geometry of the problem while other factor depends upon shape of the object, primary excitation and geometry of the problem. Shape dependent factor becomes independent of the geometry if it assumed that the object is deeply buried and in this situation this factor is termed as shape function. Field expression in a particular geometry for one object can be utilized for other object by inserting the shape function of desired object. Shape functions involved in field expression can be identified analytically for objects with simple shapes. It is observed that field expressions becomes quite simple for the case of a circular cylinder.
12 citations
01 Jan 2000
TL;DR: Hongo and Hamamura as mentioned in this paper pointed out multiple errors in a previously published work and presented the erroneous parts of the work in an error free form, which caused serious problems in the understanding of this interesting and stimulating work.
Abstract: The purpose of this communication is to point out multiple errors in a previously published work and to present the erroneous parts of the work in an error free form. The typographical errors cause serious problems in the understanding of this interesting and stimulating work. It is also observed that the plots given in the published paper also contain errors. Some accurate plots are given for the same data as given in the pre- viously published work. The plots given in this communication agree very well with the corresponding method of moments results. Efforts are also made to extend previous work by evaluating the far-zone scattered field in the lower dielectric half-space. The problem of scattering of electromagnetic waves from an obstacle buried in dielectric half-space geometry has been under- taken by many authors. The work by Hongo and Hamamura 1 is most interesting and stimulating among all of these. Unfortu- nately, there are many typographical errors in the published paper. Some of these typographical errors cause serious problems in the understanding of their work. In this communication, their work is presented in an error-free form so that interested readers can easily understand Hongo and Hamamura's important work. Efforts are also made to extend their work to calculate the far-zone scat- tered field expression in region below the buried obstacle. For convenience, equations and figures in this communication are la- beled with same equation and figure numbers as given in work by Hongo and Hamamura and only erroneous parts of the paper are discussed. It is important to note that, field plots given in that paper 1 cannot be reproduced by either using erroneous far-zone field expression which is given in the published paper or far-zone field expression given in this communication. Therefore, it is concluded that the field plots given in the paper1 also contain errors. Far-zone field expression is plotted for the same data as given in the paper1 for the case of a perfectly conducting circular cylinder using the field expression given in this communication.
1 citations