WLAN Polarization Diversity Antenna Design

• Main Authors: Tsai, Hsiao-ping, 蔡曉萍
• Other Authors: Wu Ruey-Beei
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/90585781163752767211

碩士 === 國立臺灣大學 === 電機工程學系 === 85 === In an indoor radio environment plagued by the severe spatial fading and temporal fading effects of multipath, diversity schemes usually required. This thesis proposes a flat diversity antenna, consisting of two cross-polarized dipole antennas selectly excited by a PIN diode at the feeding point, to reduce the fading effects in the indoor environment. Results presented here provide a comparison between measurement and simulation results of input impedance and radiation pattern. Parameters studies of the antennas are also presented. To verify the diversity effects of this antenna, measurement for propagation characteristics was made in one of NTU EE laboratories at 2.4 GHz. The diversity gain is forward to be at least 3dB at 99% signal availability.