الفهرس | Only 14 pages are availabe for public view |
Abstract Few years after the early investigation of ultra-wideband (UWB) wireless system, considerable research efforts have been put into the design of UWB antennas and systems for communications. These UWB antennas are essential for providing wireless wideband communications based on the use of very narrow pulses on the order of nanoseconds, covering a very wide bandwidth in the frequency domain, and over very short distances at very low power densities. The rapidly growing demand for UWB as high data rates wireless communications technology, since the Federal Communications Commission (FCC) allocated the bandwidth of UWB from 3.1GHz to 10.6 GHz. Antenna also plays an essential role in UWB system. However, there are some difficulties in designing UWB antenna as compared to narrowband antenna. The primary requirement for UWB antenna is to be able to operate over frequencies which are released by FCC. Furthermore, the satisfaction of radiation properties and good time domain performance over the entire frequency range are also necessary. In this thesis, UWB monopole antenna’s design and analysis are focused upon. The monopole antenna exhibits omni-directional pattern where the power is radiated equally in all directions. The performance parameters such as return loss, radiation pattern of the UWB hexagonal patch is extensively investigated and carried out. Both of the results have been demonstrated using simulation and experimentally whereby all results satisfy the performance under -1 OdB point from 3.1 GHz to 10.6 GHz. (of ultra-wideband (UWB. |