LINEAR AND CIRCULAR POLARIZATION VAN ATTA ARRAY ANTENNA

• Main Authors: Jui-Shuan Wu, 吳睿軒
• Other Authors: The-Nan Chang
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/t67gz7

碩士 === 大同大學 === 通訊工程研究所 === 95 === A simple passive microstrip array design is introduced comprising four ring antenna elements, and each element was excited by stripline-coupled fed from two orthogonal feeding ports. The striplines is arranged to form a Van-Atta retrodirective array which has two-dimensional self-tracking ability. We validate that this structure is catered for both linear and circular polarizations by simulation with IE3D and experiment. The fields retransmitted by all the antenna pairs spatially combine in the wave-incidence direction while interfere with each other in other directions, so that the reradiated field is smooth. The measured 10 dB responding beamwidth at 5GHz for linear polarization is 140°, and the measured 10dB responding beamwidth at 10GHz for circular polarization is 130°, both of them are much wider than the beamwidth of reflection from metal sheet with the same size.