Conception et réalisation d'une antenne multibandes alimentée par un guide d'onde coplanaire CPW

For application in wireless communication devices such as laptops, tablet computers, personal digital assistants (PDAs), and so on, a narrow width internal antenna is very attractive since it has the potential to fit into narrow spaces within the device, such as the space between the display and housing. Recently, great advances have been made in wireless local area network (WLAN) communications, and in order to satisfy WLAN standards, many wireless communication devices are now designed to be capable to operate in dual-frequencies mode. For this reason, dual-band antennas for WLAN operation are in demand accordingly. Dual-frequency of coplanar waveguide (CPW) fed microstrip patch antennas is presented in this thesis. For excitation of the proposed antennas, the capacitively coupled CPW-fed structures are proposed. One of the most promising aspects of the new antenna consists in the capability of matching the input impedance at two frequencies with a single feed point. For dual-frequency operation, the proposed designs are obtained by loading one narrow slot in the rectangular patch. An extended tunable frequency ratio range of the two operating frequencies can be obtained by varying the widths or positions of the loaded slots. In addition, experimental results for the proposed structures are presented and discussed.