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Research of Planar Printed Antennas for WLAN and UWB Communication Systems
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This book presents the research of planar printed antennas for WLAN and§UWB communication systems. At firsta 2.4-GHz horizontally polarized omnidirectional planar printed§antenna adopts the printed§Alford-loop-type structure for WLAN applications is presented. The study of the antenna printed on a simulated PCMCIA§card and that inserted inside a laptop PC are also conducted. Secondly, a planar triangular monopole antenna (PTMA) is§presented for UWB communication. The measured voltage standing wave ratio is less§than 3 from 4 to 10 GHz. 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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