【作者】 陈坤鹏；

【导师】 李书芳；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2013， 硕士

【摘要】 高性能的读写器天线和标签天线对增大RFID系统的读写距离、提升系统性能至关重要。其中,读写器天线的研究和设计重点关注阻抗、增益、轴比三个参数,标签天线的研究与设计重点关注阻抗、增益、辐射对称性两个参数。本论文的重点研究内容包括三部分：读写器天线的设计、标签天线的设计、对称标签天线的阻抗测试。在读写器天线设计部分,本论文采用切角形式的方形贴片天线,设计了一款小型化、圆极化的适用于手持设备中的读写器天线,测试结果与仿真结果基本吻合。根据实际调试和设计经验,作者总结了用切角方形贴片设计微带天线的基本流程。在标签天线的设计部分,本文重点研究了感性耦合环阻抗匹配法,利用变压器原理得到了这种形式的标签天线的等效电路,推导出了天线阻抗的理论计算公式。仿真结果也验证了理论结果的正确性。在仿真与设计的基础上,文章给出了用感性耦合环法设计标签天线的一般步骤。在标签天线的阻抗测量部分,本论文先对散射系数法进行了理论分析,然后使用该方法对一个对称标签天线进行了阻抗测试,测试结果与仿真结果显示列良好的一致性。对一个宽带的蝶形探地雷达天线的阻抗测试结果表明,散射系数法同样适用于宽带天线的阻抗测试。更多还原

【Abstract】 Reader antenna and tag antenna with high quality contribute much to the read distance and system performance. In reader antenna design, impedance characteristics, antenna gain and axial ratio are three key parameters. In tag antenna design, impedance characteristics, antenna gain, and radiation pattern are three parameters that attract most concern.This paper focuses on reader antenna design, tag antenna design and measurement of symmetric tag antenna.A compact and circularly polarized reader antenna is designed using corner-truncated square patch antenna. The antenna is suitable to handheld devices, and the measurement results agree well with simulation output. As a conclusion of this part, the procedure of designing circularly polarized reader antenna using corner-truncated square patch if provided based on design experience.In tag antenna design part, the impedance match method of using an inductively coupled loop is another research point of this paper. In this paper, the equivalent circuit and theoretical impedance formula of antenna designed using inductively coupled loop method are obtained using transformer theory. Simulation results by IE3D show agreement with formulas. This part concludes at the general procedure of designing tag antenna using inductively coupled loop method.In tag antenna testing phase, after the theoretical analysis of scattering parameter method, the impedance characteristic of an antenna prototype is obtained, which agrees well with simulation output. The implementation of scattering parameter method on a broadband bow-tie ground penetrating radar antenna gives confidence of using this method to measure broadband symmetrical antenna impedance.更多还原