Title :
Scattering by a right-angled lossy dielectric wedge
Author :
Demetrescu, C. ; Constantinou, C.C. ; Mehler, M.J.
Author_Institution :
Sch. of Electron. & Electr. Eng., Birmingham Univ., UK
fDate :
10/1/1997 12:00:00 AM
Abstract :
Electromagnetic scattering by a right-angled lossy dielectric wedge at normal incidence is considered in detail. The lossy dielectric material of the wedge is simulated using second-order impedance boundary conditions on its faces. The Maliuzhinets (1958) method is employed to obtain the total exterior field. A high-frequency asymptotic approximation of the Sommerfeld integral is carried out to obtain a UTD expression for the total field. The predictions are validated against experimental measurements taken in a controlled laboratory environment. A comparison with the widely used heuristic UTD diffraction coefficient of Luebbers (1984) is presented and the validity of the latter coefficient is discussed
Keywords :
approximation theory; dielectric materials; electric impedance; electromagnetic fields; electromagnetic wave scattering; geometrical theory of diffraction; integral equations; Maliuzhinets method; Sommerfeld integral; controlled laboratory environment; electromagnetic scattering; experimental measurements; heuristic UTD diffraction coefficient; high-frequency asymptotic approximation; lossy dielectric material; normal incidence; right-angled lossy dielectric wedge; second-order impedance boundary conditions; total exterior field;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:19971298
