Design of Circularly Polarized Antennas for Portable RFID Reader

• Main Authors: Yu-Chang Kao, 高愈昌
• Other Authors: Hua-Ming Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/50461066380616285438

碩士 === 國立高雄應用科技大學 === 光電與通訊研究所 === 97 === This thesis mainly study in RFID reader antenna. There are used the slot-coupled fed with broadband operation and circular polarization antennas. The design of the antenna are simulated by the software HFSS for the comparison. In the Chapter 2, a slot-coupled circularly polarised square patch antenna design a pair of radiating square patches with a cross-slot and a microstrip feed line are both etched on the top of a microwave substrate, and a coupling arrowshaped slot is etched on the bottom of this substrate. In the Chapter 3, a novel circularly polarized circular slot antenna using a C-shape-like strip or a pair of perturbation strips will be applied. This antenna was fed by slot-coupled and allowed easy adjustment by trimming the perturbation strips length. A good circularly polarized wave can be easily excited. In the Chapter 4, a novel circularly polarized annular-ring slot antenna in the UHF band is presented. In the proposed design, circular polarization is generated using a proper asymmetry within the annular-ring slot structure.