Analyse Et Realisation D’antennes Patch Microbande Montees Sur Substrat De Formes Cylindriques

Résumé: "This work proposes a contribution to studying, designing of the non planar antennas having a wide band for wireless communications. The first part is concerned to study planar antennas such as microstrip antenna (MSA) and dielectric resonator antenna (DRA). The electromagnetic characteristics of both antennas are calculated by the finite difference method in the time domain using the Perfectly Matched Layer (PML) as the boundary conditions and Ansoft HFSS software. The results comparison shows that the RD antenna offer high performance such as high bandwidth and a low quality factor Q. In the second part, two new cylindrical antennas were designed and fabricated for ultra wide band applications (ULB) (a bandwidth of 3.1GHz to 10.6 GHz). The first structure integrates two antennas; one has a UW band for dynamic spectrum sensing and the other has a narrow band for transmission, this antenna has a transmission coefficient less than -20 dB which ensures effective integration. The second structure is an UWB dualpolarized antenna for transmission and reception of signals on two orthogonal polarizations with a good separation between the two polarization ports"

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