Abstract
The main proposal for this thesis is three antenna types, one of which is the asymmetric monopole antenna. This antenna structure is to create the broadband impedance match by feeding it through the middle of a two-tier board. In addition to this is the smaller radiator has been fitted with an open slot to expand the bandwidth of the high frequency oscillation. As a result the entire design of this antenna can achieve the dual-band and broadband characteristics, including the frequency range of 2.31-3.83GHz and 4.88-6.0GHz. This antenna can also be applied to the WLAN and WiMAX systems. The second structure is the monopole antenna, which is connected by the gap between the symmetrical bevel ground and the radiator to create an oscillation broadband. Then through the ground ladder grove it will allow the antenna to achieve Ultra-wideband features, including the frequency range of 2.3-15.28GHz and usable in the WLAN, WiMAX and UWB bands. The third structure is the patch antenna. It is constructed by using the square radiator and a U slot type of the ground. This is due to the box design which allows the antenna field type radiation pattern to go up and high-gain characteristics. It has the frequency range of 2.34-2.52GHZ and it can be used in the WLAN band. In this thesis, these three antenna structures, bandwidth, gain value and the radiation patterns provide comparing results such as simulation and implementation upon discussion.
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