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With the rapid diffusion of wireless system, of the miniaturization and with the increasing demand of low cost radio frequency systems, has become necessary to find some applications that are able to meet present requirements. For Wireless LAN applications (WLAN), especially in closed places, microstrip antennas, coupled directly to the Radio Frequency electronics, are a good choice. The simplicity of realization, the low cost, the flexibility of use and the reduced dimensions make perfect for chip integration microstrip antenna. The physical laws establish that the critical size for an antenna at resonance is