CPW-fed monopole bow-tie antenna for WLAN application

• Main Authors: Wu, Ming-Che, 吳銘哲
• Other Authors: Kuo,Jieh-Sen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/45849031986945027078

碩士 === 高苑科技大學 === 電子工程研究所 === 100 === This article adopted the technology of coplanar-waveguide (CPW-fed) to achieve ultra-wideband (UWB) slot monopole antenna. First in order to interrupt the electric field by a character of loop coupling of the antenna and lower the operating frequency of the antenna, an inverted pentagon has embedded to the bow-tie antenna. In addition, the end of feed-line is to rely on adjust and become thinner gradually, or to vary the slot’s width and connection’s width and length of feed-line and slot in purpose which makes antenna obtain better impedance matching of bandwidth. According to the federal communication commission of U.S.A the latest definition of ultra-wideband; center frequency greater than 2.5 GHz of ultra-wideband system, need to possess -10dB bandwidth of 500 MHz at least; center frequency smaller than 2.5 GHz of ultra-wideband system, need to possess more than 25% carrier bandwidth. Ultra-wideband not only has great bandwidth, high speed transmission(maximum 500 Mbps) but also has low power consumption, high security, high speed of transmitting, low interfered, accurate in positioning. Besides, ultra-wideband has transmitted without a transmitted and replaces a superheteredyne transceiver, which is meaning the antenna can be made and designed by silicon abbreviate local oscillator (L.O) ,mixer and amplifier. Therefore reduce volume, save the cost of manufacture and power consumption, all those benefits of communication skills from ultra-wideband. But, such bandwidth of frequency (3.1~10.6 GHz) would cause the problem of interrupted from communication system, so we had a 1 mm long slit across and under the bow-tie, that reduce interferences, and to spread out the function of ultra-wideband very successfully.