Design and analysis of CPW-fed compact planar antennas for ultra wideband communication systems
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] In this research, three new designs of planar compact ultra-wideband (UWB) antennas have been studied, simulated, and experimentally measured. Their structures are not complicated in design, easy in fabrication with low cost. They are in different physical sizes and considered small compared to many recent published UWB antennas that have similar performance. The proposed antennas have ultra-wide bandwidth that cover the entire bandwidth allocated by FCC for such applications. They are made to be planar structure with a single layer in order to be easier in fabrication and for use in wireless devices and applications. The used feeding technique is coplanar wave-guide (CPW) in all of them due to the great advantages of this feeding methodology. Each design has certain more superiority over the others either in terms of operating frequency range, power gain, radiation pattern, or structure size. Although, all compact patch antennas demonstrate high performance results and are very suitable for ultra-wideband systems. Finally, since there are a variety of ultra-wideband applications with several characteristics requirements, the research is composed of three different sizes of compact planar single layers antennas. These antennas have similar or better performance than some other large size designs, which makes it suitable for very compact wireless gadgets. Thus, the ultra-wideband (UWB) systems designer will be able to select the most appropriate design for the application based on the antenna characterizes and size.
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