Design and Performance Analysis of Printed Dipole Antennas for Wlan Applications

5.1 INTRODUCTION MIMO wireless systems have demonstrated the potential to increase communication spectral efficiency in a rich multipath environment. From an antennas perspective, different array configurations and types of element have been proposed and analyzed for MIMO links. Nowadays in military and commercial applications there have been ever growing demands for antennas. The standard dipole antenna has an omni-directional radiation pattern; however a high directive gain is required in modern wireless communication systems due to development of broadband communication (Fan et al 2007). A printed antenna with broad operational bandwidth is preferred in many wireless applications. In this research, the printed dipole array is presented for potential use in wireless communication. Compared with traditional line antennas, printed dipole antennas have advantages like planar structure, small volume, low profile, light weight, ease of fabrication and low cost (Li et al 2009). A dual band antenna with printed balun is reported in (Chen et al 2004), but the effect of balun is not clearly explained. The CPW-fed dual band antennas discussed in Sze et al (2006), Liu (2004), Liu (2007) have simple structures but larger in size. The collocated electric and magnetic dipole antennas, E-shaped printed monopole antenna and dual broadband antennas are designed, fabricated and analyzed for