| In recent years, ultra-wideband (UWB) wireless technology has become one of extremely competitive and most promising technologies for wireless communications. According to the 2002 U.S. FCC requirements, UWB communication band is 3.1-10.6GHz, the transmitter power of this band is not higher than -41.3dBm/MHz. We can see that the provision limits of the launch power and thus the shot-distance wireless data transmission will become important for the ultra-wideband wireless technology applications. The ultra-wideband wireless systems compared to conventional wireless systems have many advantages such as: simple structure, higher data transmission rate and so on. But because of great bandwidth, the design of antenna becomes a challenge.This thesis will design two ultra-wideband planar antennas for the short-distance data transmission. The first chapter simply introduces the theoretical study of the ultra-wideband antennas, microstrip antennas, as well as the simulation software CST. In study of the theory of the ultra-wideband antenna, the time-domain characteristics and frequency-domain characteristics of the ultra-wideband antennas are concerned.The second chapter introduces a small ultra-wideband planar slot antenna, and uses two different fed structrues that are microstrip and coplanar waveguide-fed structures. Through the actual test comparison, in the antenna miniaturization process, the coplanar waveguide structure better than the microstrip structure.The third chapter introduces an ultra-wideband planar monopole antenna that references the Vivaldi index slot antenna.Chapter IV summarized the main work and innovation of this thesis. The intending work was also expected. |
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