The Influences of Feeding Via Upon the Bandwidth of Planar Slot Antenna Excited by Microstrip

• Main Authors: Pei Ying Lin, 林佩穎
• Other Authors: Ching Lieh Li
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/18740370482614134810

碩士 === 淡江大學 === 電機工程學系 === 92 === In this thesis, the characteristics of the folded slot antennas and the influences of the feeding via upon the slot antenna bandwidth are investigated in details. The antennas studied are polarized and excited by a 50Ω microstrip line, and are linearly polarized. There are two kind of folded slot antennas discussed, in the thesis: one is single folded slot antenna and the other is double folded slot antenna. As compared to a simple slot antenna, it is found that the bandwidth of a single folded slot antenna is slightly wider. In addition, double folded slot antennas can provide significantly wide bandwidth up to 34%, which serves as a good candidate for UWB application. The metallic contact between the microstrip line and the ground plane thought the via hole forms a short-circuit. The feeding via hole can reduce the cross polarization and the antenna size. In this thesis , all antennas fed by microstrip line are designed to operate in the ISM bands.