SIMPLIFIED CPW-FED BROADBAND ANTENNA INVOLVING THE ZEROTH ORDER MODE

• Main Authors: Guo-Mao Hsu, 許國懋
• Other Authors: The-Nan Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/md7k3n

碩士 === 大同大學 === 通訊工程研究所 === 103 === This thesis describes the broadband antenna which is fed with the simplified coplanar waveguide (CPW) in the zeroth order mode, and is based on CRLH-TL (composite right/left handed transmission line ) theory. It is built on the upper surface of an FR4 substrate with thickness of 1.6 mm. A straight shorted strip is connected between the center conductor and the ground plane as a loaded parallel element. To increase the parallel inductance and to save some space, the straight strip can be replaced by a meandered strip. This straight strip will excite the resonance frequency. The measured results show that the fractional bandwidth is extended up to 90% and radiation efficiencies of the ZOR (zeroth-order resonance)，FOR (first-order resonance) and SOR (second-order resonance) are 82.9%，93% and 77.8% respectively. In the 10 dB return-loss bandwidth can cover from 1.8GHz to 4.9GHz and the measured peak gain is between 2.9 and 4.5 dB .