Multi Slotted Planar Radiating Structures For Wideband Applications

Abstract

With the recent advancement in wireless communication, the demand for small, compact and wideband antennas has increased rapidly. Semiconductor electronic devices are getting reduced in dimension due to emergence of integrated circuits, therefore, the need for the smaller antennas becomes quite necessary. It is observed that the bandwidth is directly proportional to notch dimensions. In chapter four, a modified L strip fed stacked patch antenna is theoretically analyzed for wideband applications. Dual U shaped slots are incorporated in the radiating patch and the maximum bandwidth is achieved. Antenna parameters are calculated by CST Microwave studio and equivalent circuit model theory is also presented. In chapter five, a microstrip line fed compact monopole printed antenna is designed for Bluetooth, WLAN and WiMAX applications. The proposed antenna comprises asymmetric Ushaped radiator embedded with a T shaped strip in the middle of the patch. Stair shaped defected ground plane with rectangular slit is used for the bandwidth enhancement. The radiation characteristics are almost omnidirectional in H plane and bidirectional pattern in E plane. In next chapter, the proposed design consists of two kite shaped radiators in coalesced form along with a tapered ground plane embedded with rectangular slot. Group delay, signal analysis and antenna isolation are also studied at different orientations of the antenna and found to be quite satisfactory to meet the requirements for UWB applications. Finally, in chapter eight, the overall findings of the entire investigations have been described. Some future works that may be carried out, using the investigations made in the present endeavors, are also discussed. newline