| Summary: | 碩士 === 義守大學 === 電子工程學系碩士班 === 95 === In this thesis, three kinds of ultra wideband (UWB) monopole antennas having band-notched frequency were proposed. First, a printed circular disc monopole antenna with a half ring slot having frequency band-notch characteristic
was presented. By etching a slot in the UWB monopole antenna, a notch frequency can be operated. The etched slot can control the notch frequency and bandwidth of the antenna. Second, a printed monopole antenna fed by coplanar waveguide loading split-ring resonators (SRRs) was proposed. SRR loaded CPW structure can achieve a stopband. Notch frequency and attenuation can be controlled by tuning the size and stages of SRR. Finally, we present a printed monopole antenna fed by microstrip lines loading complementary split-ring resonators (CSRRs). For improving attenuation of notch frequency, it can be seen that the performance at high frequency band is improved with the extra patches. Moreover, CSRR stages are decreased with extra patches.
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