Design of Planar Circularly Polarized Monopole Antenna by Coupling Structure

• Main Author: 陳聖文
• Other Authors: 吳俊德
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/w6qj3e

碩士 === 大葉大學 === 電機工程學系 === 106 === In this paper mainly studies and designs circularly polarized antennas. The circular polarization characteristics are generated by a special structure. The first antenna uses a polygon as the antenna pole structure to generate a circular polarization effect by means of asymmetry and coupling. The second antenna uses radiated energy to scoop, and the circular polarization characteristics are achieved by the cyroid ring ground plane. The third branch uses antenna offsets to achieve asymmetry to produce circular polarization. The frequency bands for this study include Wireless LAN, Long Term Evolution, and Ultra High Frequency. The operable frequency band is based on a reflection coefficent below -10 dB and an axis ratio below 3 dB . Key Words : Dual Band Circular polarization, CPW feed, Ultra Highg Frequency (UHF), Wireless LAN( WLAN), Long Term Evolution (LTE)