Design and Analysis of Integrating Antennas for UWB and Cognitive Radio Applications

摘要

The increasing demand for improvement and organization of new services has impact the hard ware design method including radio frequency front end, antennas especially in the portable devices. Hence, novel arrangement that are multimode, multi band, low cost, low profile, and simple to integrate into the highlight compact device are needed. Integrating wideband and narrow band antennas presented for various wireless applications. The integration idea is based on the sharing few areas of the one antenna between the other antennas. In this work different antennas are presented for ultra-wide band and cognitive radio applications. The UWB is a short range radio communication that perform high speed communication with rates more than 100 Mbps. The federal communication committee (FCC) defined the UWB range from 3.1GHz to 10.6 GHz for commercial usage. The challenge is to integrate two antennas in a limited space and provide good isolation exist between the antenna ports. Microstrip antennas integrated with DRA are presented cognitive radio applications. The DRA antennas for UWB applications are presented. The DRA antenna with band notch are presented for WLAN applications. First, a new semicircular- semi hexagon microstrip antenna is integrated with cylindrical DRA is proposed for UWB and cognitive radio applications. The proposed antenna placed on a 39mm×38mm×1.6mm fiber glass rein forced epoxy (FR4) dielectric substrate it covers the frequency range from (2.58 GHz to 14GHz) . The cylindrical DRA is aperture fed used for narrow band application. It covers the frequency range from 10.07GHz to 11.38 GHz. The design provide greatest isolation between the two antenna ports achieved. Dielectric resonator antenna (DRA) are having wider band width, low profile, light weight, low conductor loss, low dissipation loss and wider bandwidth compare microstrip antennas. So the DRA antennas are designed for UWB applications.