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Title of Thesis

Scattering of Electromagnetic Waves From A PEMC Circular Cylinder Placed Under Wide Double Wedge

Author(s)

Muhammad Naveed

Institute/University/Department Details
Department of Electronics / Quaid-i-azam University, Islamabad
Session
2011
Subject
Electromagnetics
Number of Pages
100
Keywords (Extracted from title, table of contents and abstract of thesis)
Geometry, Region, Conductor, Under, Electromagnetic, Wedge, Transmission, Waves, Pattern, Solution, Scattering, Cylinder, Numerical

Abstract
A new wedge di®raction function, called as Naveed-Naqvi-Hongo (NNH) wedge di®raction function, is derived and evaluated asymptotically by applying the steepest descent method.It is found that the total Żeld with NNH solution is continuous at the shadow boundaries and gives the well known non-uniform expression for the observa- tion point far from the shadow boundaries.Numerical comparison of NNH solution is made with exact series solution and Pauli-Kouyumjian-Pathak (PKP) result.It is found that the agreement among these three is fairly well.In contrast to the ex- pressions proposed by Kouyoumjian and Pathak, the NNH solution does not need the parameters to switch for the region of validity, hence it is easier to make a numerical code.The validity of NNH wedge di®raction function is further checked by evaluating the di®racted Żeld from a geometry which contains an inŻnite slit in a perfect electric conducting (PEC) plane.It is further extended to a more complex geometry consisting of two parallel PEC wedges and a perfect electromagnetic conductor (PEMC) circular cylinder which is placed under the PEC wide double wedge.It is found that by using the NNH solution, the results evaluated for some special cases, including the transmission coe±cient of PEC slit, are in fairly good agreement with the published work. The transmission coe±cient and the di®raction pattern of PEC wide double wedge is studied and elaborated by considering a geometry consisting of a coated PEMC cylin- der placed under the two parallel wedges.The cylinder is coated with double positive (DPS) or double negative (DNG) materials.Finally, a comparison of the transmission coe±cient of PEC geometry, as evaluated by using NNH solution, is made with the geometry of more practical nature, that is, an impedance slit.

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2,176 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 CONTENTS

 

vii
58 KB
2

1

INTRODUCTION

 

1
100 KB
3 2 EVALUATION OF UNIFORM WEDGE DIFFRACTION FUNCTION

2.1 Previous Work
2.2 Naveed-Naqvi-Hongo (NNH) Wedge Diffraction Function
2.3 Conclusion

12
662 KB
4 3 PEMC CYLINDER PLACED UNDER PEC WIDE DOUBLEWEDGE

3.1 PEC Slit Excited by Uniform Plane Wave
3.2.PEMC Cylinder Placed Under PEC Wide Double Wedge
3.3.Coated PEMC Cylinder Placed Under PEC Wide Double Wedge
3.4.Conclusion

24
930 KB
5 4 PEMC CYLINDER PLACED UNDER AN IMPEDANCE SLIT

4.1 Impedance Slit Excited by Plane Wave
4.2 PEMC Cylinder Placed Under an Impedance Slit
4.3 Results and Discussion
4.3 Conclusion

56
571 KB
6 5 SUMMARY AND CONCLUSION

 

74
58 KB
7

6

REFERENCES

 

76
74 KB