Abstract:
The work of this thesis is part of the continuity of research on antennas both miniature
and multi-band. The first part is devoted to the theoretical study of the antennas that
apply in the field of telecommunications, different techniques of miniaturization and
multi-band technology. Turning to the description of the finite difference method in the
FDTD time domain, this method and two other software programs (the Ansoft HFSS
and the CST Microwave Studio) are used to calculate the electromagnetic
characteristics and to study the effects of certain parameters on the performance of
planar rectangular monopole antennas with a slot and two slots. The second area of
research focuses on the development of original miniature antennas that can meet the
needs of today's wireless systems based on slot insertion and the use of fractal shapes
to reduce the size of antenna. The first structure is an antenna with ground plane slots
that operates in two bands at 2.4 GHz (WLAN) and 3.75 GHz (WiMAX). The second
flower-shaped fractal antenna with a defective ground plane provides three 2.4 GHz
(Bluetooth), 3.6 GHz (WiMAX) and 5.8 GHz (WLAN) resonance frequencies.
