| Summary: | 碩士 === 正修科技大學 === 電子工程研究所 === 93 === This thesis proposes ultra-wideband designs of printed slot antennas. First,rectangular slot antennas with various feeding structures for wideband operations are investigated. It is found that a rectangular-shaped microstrip-line-fed structure is an effective feeding scheme to improve the broadband impedance characteristics of the rectangular slot antenna. Then, for
achieving an UWB operation, a pentagon slot antenna with an offset rectangular-shaped microstrip-line-fed structure is presented. Finally, by inserting a C-shaped slot on the rectangular-shaped microstrip feedline, an UWB pentagon slot antenna with band notch function can be obtained.
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