| Summary: | 碩士 === 樹德科技大學 === 電腦與通訊研究所 === 97 === Printed-circuit board (PCB) antenna with useful bandwidth covering from 3.1 GHz to 10.6 GHz is suitable for wireless ultra wideband (UWB) application. Firstly, we present UWB developed and application. Next, to present a low profile, elliptical antenna etched on PCB with dielectric constant 4.2 achieving the above specified bandwidth. And then, to reduce the size of the product, an elliptical dipole antenna with PCB dielectric constant 10.2 has been fabricated. Swept frequency return loss, impedance and radiation patterns of these antennas have been measured. Design criteria for this elliptical dipole antenna is also investigated.
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