| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 94 === This thesis presents the designs of a single-feed shorted triangular patch antenna with dual-band and broadband operations. The thesis is mainly divided into three topics. First, the design of a shorted triangular patch antenna with dual-band operation is presented. By placing two shorting walls at the opposite edges of a tip-truncated triangular patch antenna with a V-shaped slot, two different resonant modes can be excited simultaneously. The two resonant modes can radiate a conical monopole-like pattern and a broadside pattern, respectively. Second, the method of coupling two resonant modes with similar radiation patterns is used to achieve the broadband antenna design. For the proposed design, the required antenna height is less than 0.06 free-space wavelengths, and the 10 dB impedance bandwidth is more than 25 %. In addition, a prototype with the operating bandwidth capable of covering UMTS and ISM bands (1920 ~ 2483 MHz) is implemented. Finally, the compact design of a shorted triangular patch antenna with dual-band and broadband operations is presented. For the shorted triangular patch antenna, when the antenna area is reduced by symmetrically halving the patch size, the operation frequency and the impedance bandwidth have not obvious variations. Consequently the patch size can be roughly reduced to 50 %. The simulations for the studied antennas in the thesis are also performed by using electromagnetic softwares, and they will be compared with the experimental results.
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