中文摘要：

为被动收音机频率鉴定(RFID ) 的性能分析和测试在极端高频率(UHF ) 的系统在空间和 line-of-sight (LOS ) 的乐队室内的环境在这篇文章被进行。不同材料的表演降级被介绍，以标签收到的力量，读者，通讯范围和连接信息评价，等等。特别地，褪色的 multipath 和根意味着在 LOS 室内的环境散布的平方(RMS ) 延期被一个 5 光线模型与不同极化分析，例如水平极化，垂直极化和圆形的极化。实际测试在一座办公大楼的一个室内的阳台上被执行。另外，电场环境被模仿用 Ansoft HFSS 的工具分析 multipath 降级。根据测试，识别率与理论分析和模拟的结果几乎一致。褪色的小规模和地 0 被观察。multipath 降级显著地在通讯范围和识别率上影响被动 RFID 系统，并且它也是系统性能上的关键限制之一。在 multipath 环境的力量的变化能也影响信息率，当率在短范围为可得到的标准和应用是足够静止的时。

英文摘要：

Performance analysis and test for passive radio frequency identification（RFID） system at ultra high frequency（UHF） band in free space and line-of-sight（LOS） indoor environments are conducted in this article.Performance degradation of different materials is presented,in terms of power received by tag and reader,communication range and link information rates,etc.Particularly,the multipath fading and root mean square（RMS） delay spread in LOS indoor environments are analyzed by a 5-ray model with different polarization,such as horizontal polarization,vertical polarization and circular polarization.A practical test is carried out on an indoor balcony of an office building.In addition,the electric field environment is simulated to analyze multipath degradation using the tool of Ansoft HFSS.According to the test,the recognition rate is almost consistent with the results of theoretical analysis and simulation.The small scale fading and the field nulls are observed.The multipath degradation significantly affects the passive RFID system on communication range and recognition rate,and it is also one of the key limitations on system performance.The variations of power in multipath environments can also influence the information rates,while the rates are still enough for available standard and applications at short range.