This thesis presents the research of planar printed antennas for WLAN and UWB communication systems. At first the design simulation, fabrication, and measurement of a 2.4-GHz horizontally polarized omnidirectional planar printed antenna for WLAN applications is presented. The antenna adopts the printed Alford-loop-type structure. The three-dimensional (3-D) EM simulator HFSS is used for design simulation. The designed antenna is fabricated on an FR-4 printed- circuit-board substrate. A comparison with the popular printed inverted-F antenna (PIFA) has been conducted. The study of the antenna printed on a simulated PCMCIA card and that inserted inside a laptop PC are also conducted. The HFSS model of a laptop PC housing, consisting of the display, the screen, and the metallic box with the keyboard, is constructed. Secondly, a planar triangular monopole antenna (PTMA) is presented for UWB communication. A printed PTMA has been realized by using the FR-4 printed circuit board substrate. The measured voltage standing wave ratio is less than 3 from 4 to 10 GHz. In the UWB communication frequency range, the measured phase distribution of the input impedance is quite linear and the H-plane patterns are almost omni-directional. Then, a novel technique to enhance the bandwidth of the conventional PTMA is presented. With two symmetrical corrugations extended from the flat ground plane, a significant improvement on the impedance bandwidth up to about 4:1 can be achieved. Measured VSWR of the printed PTMA with the ridged ground plane is less than 2 from 3 to 12 GHz. The measured antenna patterns also show the monopole-type omni-directional radiation patterns from 3 to about 10 GHz.

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