Analysis of wave absorbing materials / Amir Shariman Ishak

This thesis presents an analytical approach of designing Wave Absorbing Non-Magnetic Materials (WANMMs) through implementation of the lossy line transmission technique in which the study of the relationship between the reflection coëfficiënt of the material and the oblique angles of incidence are considered. These materials are made of several dielectric layers, usually on top of a conducting layers. Matching characteristics of this method are investigated in detail firom many kind of experimental data. The total absorption of the electromagnetic energy is done in the last lossy layer, whereas the other layers are used to match the wave impedance of the WANMMs to that of the incidence media for the oblique angle of incidence only at different microwave frequencies. These materials will be useful for the wall in laboratories and other office buildings to prevent the internal reflection. It may be a substitution to the chambers which use the thick anaechoic material.