Investigation on dielectric resonator antennas

The area of wireless communications has been increased from last decade. The success of the second-generation(2G) motivates the development of wideband 3G, 4G, cellular phones and other wireless products and services, including WLAN, local multi-point distributed networks(LMDS), home RF, Bluetooth etc. The crucial component of wireless network is the antenna. Even though our cities flooded with antenna of different kinds of shapes, maximum we prefer safety, low return loss, low power, multifunctional and multi band devices. All the above demands will be fulfilled by the development of highly efficient, small-size, low-profile antennas like micro strip and dielectric resonant antennas (DRAs) in wireless domain. The dielectric resonant antennas are highly preferred when compare to other antennas because of its negligible metallic losses at higher frequencies. In this paper i analyze how to increase impedance bandwidth in Hemispherical DRAs especially for Wi-Fi applications and i compare HDRA characteristics for different layers and with rectangular DRA.