| With the rapid development of wireless communication technology, wireless communication systems become more and more dependent on the using of ultra-wideband antennas. How to avoid overlapping wireless communication band, which is provided by the FCC (Federal communications Commission) in the United States, has been the focus of many research scholars. However, the research of the ultra-wideband band-notched antenna indicates that it can effectively avoid overlapping bands. The biggest advantage of that technology is that it does not need to add additional microwave devices, and that it also can effectively reduce the cost of wireless communication systems. Therefore, designing the simple and practical structure with ultra-wideband band-notched antenna is the development direction in the field of wireless communication systems.Designing and analyzing of ultra-wideband band-notched microstrip antenna is the main purpose of this paper, so as to satisfy the basic requirements of the wireless communication system. To avoid the band without overlapping effectively and the interference of narrowband system which includes the WiMAX (3.3 GHz to 3.3 GHz) and WLAN (5.1 GHz to 5.1 GHz). On the basis of ultra-wideband antenna, with the using of slotting technology and adjunction of parasitic strip beside the microstrip feeder, the purposes of that technology can achieve ultra-wideband microstrip antenna with a notch characteristic in WiMAX (3.3GHz-3.8GHz) and WLAN (5.1GHz-5.9GHz) band. In the process of designing, the HFSS software 13.0 is used for the optimization of antenna structure.This thesis has following parts:(1)this thesis introduces the basic theory and characteristics of the antenna parameters, such as antenna directivity, efficiency and the gain, frequency response, the input impedance, bandwidth and polarization mode, etc., and the method of the ultra-wideband band-notched antenna.(2)Firstly, this thesis designs a microstrip antenna with ultra-wideband characteristics, and uses Ansoft HFSS 13.0 software for simulation and optimization. Secondly, the using of ultra-wideband antenna with slotting technology achieves a single notch features in WLAN (5.1GHz-5.9GHz) band. The parameters of ultra broadband single band-notched microstrip antenna are analyzed and optimized by using the HFSS 13.0 simulation software. Finally, the ultra-wideband antenna and ultra-wideband single band-notched microstrip antenna are tested and processed.(3) Based on the ultra wideband, a single band-notched microstrip antenna with the parasitic strip beside the microstrip feeder achieves the dual-band notch characteristic with WiMAX (3.3GHz-3.8GHz) and WLAN (5.1GHz-5.9GHz) in the ultra-wideband band. The parameters of ultra broadband double band-notched microstrip antenna are analyzed and optimized by using the HFSS 13.0 simulation software. Finally, testing and processing for the ultra-wideband double band-notched microstrip antenna. |
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