الفهرس 
THEORY OF MULTILAYER STRUCTURESOnly 14 pages are availabe for public view
 |  | from | 105 |  |  |
| | | from | 105 | | |
Abstract
Dielectric multilayer structures are widely used in electromagnetic. In this
thesis dielectric multilayer structures were designed to achieve two main goals.
The first is to have structures that totally reflects the electromagnetic wave
incident upon it. The second is to have completely non-reflecting structures, that is
totally passes (absorbs) the incident electromagnetic wave.
The aim of the design is to determine for the required application ; (1) The
number of layers of the structure, (2) The thickness of each layer, and (3) The
dielectric constant of each layer.
The completely reflecting structures include dielectric mirrors which have
extremely low losses at optical and infra red frequencies compared to ordinary
metallic mirrors. Dielectric mirrors with equal ( λ/4) wavelength and unequal
wave length layers were designed. Multi band non reflecting structures, long
wavelength reflectors and short wavelength reflectors were also designed.
The other class of multilayer structures is the non reflecting structures. The
Chebyshev procedure was used for the design. The procedure was used to design
non reflecting materials for anechoic chambers. Compared to conventional
materials used for the construction of anechoic chambers, the designed structure
;(1) is much cheaper, and (2) occupies much less space. Also non reflecting multilayer
radome for radar antennas was designed. The radome protects the antenna
from environmental conditions without sacrificing the antenna gain. A third
application of non reflecting multilayer structures was the design of a cover for
solar cells. The cells convert solar energy into electrical energy and the cover
greatly reduces the reflection of light incident upon the cells.