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|Title||Design a Microstrip Patch Antenna for Ultra Wide Band (UWB) Applications|
The development of Ultra Wide Band (UWB) technology, including antennas as an essential part of wireless communication systems, is greatly accelerated. However, there are more challenges in designing a UWB antenna more than a narrow band one. It should be capable of operating over an ultra-wide bandwidth as allocated by the Federal Communications Commission (FCC) from 3.1GHz to 10.6GHz. At the same time, the radiation properties over the entire frequency range are also necessary to be satisfactory. This thesis focuses on a designing a novel microstrip Ultra Wide Band (UWB) antenna for optimum performance like wide bandwidth, good matching impedance, small antenna size exhibits a good voltage standing wave ratio (VSWR) performance and its E– and H–plane radiation patterns are stable over the UWB frequency range and others. This antenna has a new patch shape that allows for providing good properties. Discussing the necessary parameters of UWB antennas, and studying the techniques of enhancing the bandwidth of a microstrip UWB are also investigated, to get antenna exhibit excellent performance of UWB characteristics with enhanced bandwidth. The first antenna studied in this thesis is a microstrip star-shape antenna which is a new shape and we call it (SSA) by using Ansoft’s HFSS software package. The antenna consists of a star-shape radiating element with a partial ground plane and a microstrip line feed from the edge of the patch. Feeding patch from edge consider as a method for enhancing the bandwidth as we will see later. The parameters structure of the antenna was optimized to achieve the widest antenna bandwidth and impedance matching. A parameter study was conducted to optimize antenna parameters. It helps to investigate the effect of different parameters on the impedance bandwidth. So our study are also includes studding the effect of feed line shift of microstrip line from center of patch to its edge and shows how it plays an important role with enhancing the bandwidth and reaches it to 18.6GHz (from 3.9GHz to 22.5GHz). Also the effect of the ground plane length is studied and shows how it serves as an impedance matching circuit and also it tunes the resonant frequencies. The effect of feed line width is also investigated. The second antenna studied is a slotted star shape antenna which has new ground plane shape. It consists of partial ground plane with multiple rectangular slots at top side of ground. This is another method for enhancing the bandwidth. Also the effect of the length and width of slots was studied, and shows how it has opposite effect on return loss value. The impedance bandwidth of this antenna is enhanced and reaches 20.6 GHz (3.9 GHz to 24.5 GHz). The properties of antenna namely; bandwidth, input impedance, radiation pattern and VSWR, were investigated for both antennas and show how we get good results for both.
|Publisher||الجامعة الإسلامية - غزة|
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