Yeni bir ultra geniş bandlı mikroşerit anten tasarımı

Demands for high rate and broad band communication technologies have been increased in recent years. These requirements lead organization such as FCC to define a new frequency range and standards to fulfill the needs. One of these standards today known as Ultra Wideband (UWB). The following thesis focused on this technology and tried to present a practical design of antenna supporting UWB systems. UWB technology is clearly presented in the second chapter and explains different approaches used to cover its requirements. The technology itself, without its implementation would be meaningless; therefore, methods of implementation and main applications of this technology will be described briefly. Methods of implementing UWB technology on microstrip substrate antenna disscussed in chapter three. A short introduction about the history of antennas will be good start for this chapter. The key to understand an antenna and its functioning is electromagnetic radiation. Despite prevalent believes, there is no need to be specialist in integro-differential equations to understand electromagnetic radiation. In order to grasp the concepts of electromagnetic radiation, one only needs to understand the electricity and magnetism. Researches in these fields, goes back to nearly two thousand years. Great scientists worked in these fields to deliver the great results to James Clerk Maxwell, who is the most known person in electromagnetic fields for what are currently called the Maxwell equations. In this chapter, it's tried to cover all the materials might be required for design procedure. Different feeding techniques that are used in microstrip antennas are also described. Last part of chapter three presents different techniques for widening the bandwidth. In chapter 4, a new heptagon shape microstrip antenna is presented. The antenna is fed using probe feeding technique with uniform ground plane. Proper slots have been employed to enhance the bandwidth. The antenna is designed and fabricated on the substrate of FR4 which will decreases the cost of fabrication as an important factor in industry. All the simulations have been done using HFSS software.