| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 94 === The finite-difference time domain(FDTD) method, instead of commercial software packages such as HFSS, IE3D, and CST, is successfully used to study characteristics of U-Slot and modified U-slot Patch Antennas. The validation of the FDTD method is checked by measurements. The modified U-slot patch antenna using a metallic oblong-patch with different angles is respected to the center line as the bottom layer has been proven that it can provide wide-band enhancement, multi-band operation, good impedance matching, and high antenna efficiency. Finally, The modified U-slot patch antenna with a small ferromagnetic U-strip inserted in the metallic bottom layer has been shown to provide a return loss in excess of 10 dB over an extremely wide frequency range and high antenna efficiency.
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