Design of Elliptical and Fork Antenna for Ultra-Wideband Applications

• Main Authors: Ting-Yi Chou, 周庭儀
• Other Authors: Kwong-Kau Tiong
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/65428854000556295310

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 97 === The purpose of this thesis is present a planar ultra-wideband antenna with a band-notched characteristic. By inserting a C-shaped slot on the elliptic radiating patch, a notched frequency band is created. The slot length contributes to both the notch center frequency and notch bandwidth. This antenna design is a breakthrough for selecting the notch band and can be directly applied to UWB communications where the band-notched characteristic is needed. In this design, a 3-12 GHz frequency range for VSWR less than 2 is obtained. Another UWB antenna is a tuning fork type structure. It exhibits a 10 db return loss bandwidth over the entire frequency band from 3.5GHz to 11 GHz. The structure is designed by first considering a rectangular patch antenna on FR4 substrate fed with a 50 ohms microstrip line. The width of the partial ground, the width and position of the feedline are optimized to satisfy the operation requirement of UWB. The rectangular patch is then finally modified to tuning fork structure by maintaining the UWB frequency range. Our proposed antennas show monopole-like radiation pattern and good agreement has been obtained between the simulation and experiment results.