共查询到18条相似文献,搜索用时 140 毫秒
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《现代电子技术》2014,(9)
我国的UHF RFID使用的800/900 MHz频段距离移动通信CDMA800、GSM等频段较近,易受到移动通信系统的干扰,导致RFID标签的解调误码率增加。在分析干扰形成机理的基础上,通过对UHF频段频率分布的分析,提出了抗移动通信终端干扰的UHF RFID标签天线设计方法,推导出介质基板厚度h计算公式。将该方法应用到IT设备资产进行管理的RFID标签天线设计上,仿真结果表明,RFID频段的回波损耗S11值均小于-10 dB,CDMA800、GSM等频段的回波损耗S11均大于-10 dB,RFID频段的电压驻波比VSWR值均小于2,移动通信频段的电压驻波比VSWR值均大于2,获得了良好的抗移动通信终端干扰的性能。 相似文献
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为提高轮胎嵌入式UHF RFID 电子标签读取可靠性,需要解决一对矛盾,即一方面,为保证电子标签与轮胎有良好的粘合性和绑定性,要求标签天线尺寸足够小;另一方面,轮胎无线电环境差,轮胎材料对电磁波的固有介质损耗和干扰要求电子标签天线尺寸应足够大,以提高电磁辐射能力。针对以往设计方法复杂、不利于标签与轮胎绑定的问题,根据Bode-Fano 阻抗匹配的约束,利用弯折天线的周期性和紧凑性,提出了一种简单、具有良好阻抗特性和绑定特性的轮胎嵌入式小型化UHF RFID 弯折天线方法,设计了一种物理空间受限的轮胎嵌入式小型化UHF RFID 弯折天线。HFSS 仿真验证表明,设计的天线在833 ~971MHz 频带范围内回波损耗小于-10dB,覆盖了美国RFID 标准带宽902 ~928MHz,最大辐射增益为2. 4dBi。最后,通过设计的轮胎嵌入式RFID 电子标签测试,结果表明:当读取距离小于90cm 时,标签识别率大都大于80%;当读取距离小于50cm 时,标签识别率大于90%,标签与轮胎具有良好的绑定效果,满足设计要求。 相似文献
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本文设计了一种新型的抗金属无源UHF射频识别(RFID)印刷标签天线.该天线可以应用在卷烟包装上,仿真和实测数据证明,在915MHz处天线的阻抗为(20+j149)Ω,能和Alien Higgs -2芯片很好的实现共轭匹配.该标签天线的工作带宽为31MHz,通过RFID阅读器实测表明,所设计的标签天线读取距离可达到0.8m. 相似文献
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为了加强对医疗器械的跟踪管理,尤其是对手术前后手术剪数量的有效监测,设计了一款可应用于手术剪的超高频(UHF)无源小型化射频识别(RFID)标签天线。该标签天线采用集总元件加载技术以及短路技术方法实现了天线的小型化设计。通过对电容容值以及天线结构尺寸的调整,可实现对标签天线谐振频率以及标签天线特性阻抗的调节。标签天线结构参数经仿真优化,最终设计尺寸为6 mm×3 mm×1 mm。标签嵌入手术剪中的最大读取距离为1.2 m。根据仿真结果对天线加工并对实物进行测试,测试结果与仿真结果吻合较好。 相似文献
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由于各个国家分配给UHF频段RFID系统的频率不同,以及全球跨国供应链中物品跟踪管理的发展要求,宽带RFID标签天线已然成为各国学者研究的一个热点。文中采用在辐射贴片上开槽来拓展带宽的方法,设计了一款双T型槽宽带标签天线。所设计的天线为无通孔与短路结构的简单天线,尺寸仅为33mm×25mm×1.6mm,工作带宽覆盖了各个国家分配给UHF频段的频率范围,最大理论读取距离可达7.58m。通过改变槽的尺寸可以方便地调节天线与标签芯片之间的匹配。与其他宽带标签天线相比,该天线在小型化、读取距离方面具有明显优势。由于测试条件有限,天线输入阻抗实测曲线走势与仿真曲线基本一致,但实测曲线向低频偏移了200MHz左右,实测值与仿真值相比有一定程度的衰减。 相似文献
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针对射频识别标签天线小型化、抗金属环境的实际需求,提出了一种可应用于金属环境的超高频射频识别标签天线.通过在矩形贴片上开槽来实现小型化,天线总尺寸为56 mm×50 mm×1.6 mm.通过改变槽的尺寸调节标签天线的输入阻抗,结合等效电路图分析抗金属标签天线的设计过程,从而方便地实现与标签芯片的共轭匹配.实验结果表明,实测和仿真结果比较吻合,标签阻抗匹配良好,实测最大读取距离达3.1m.与其他标签天线相比,该天线具有结构简单、成本低、易于实现和读取距离远等优势. 相似文献
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Wonkyu Choi Hae Won Son Ji‐Hoon Bae Gil Young Choi Cheol Sig Pyo Jong‐Suk Chae 《ETRI Journal》2006,28(2):216-218
This letter presents the design for a low‐profile planar inverted‐F antenna (PIFA) that can be stuck to metallic objects to create a passive radio frequency identification (RFID) tag in the UHF band. The designed PIFA, which uses a dielectric substrate for the antenna, consists of a U‐slot patch for size reduction, several shorting pins, and a coplanar waveguide feeding structure to easily integrate with an RFID chip. The impedance bandwidth and maximum gain of the tag antenna are about 0.3% at 914 MHz for a voltage standing wave ratio (VSWR) of less than 2 and 3.6 dBi, respectively. The maximum read range is about 4.5 m as long as the tag antenna is on a metallic object. 相似文献
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A planar and miniature (0.09lambda times 0.13lambda) radio frequency identification (RFID) tag antenna is described whose radiation pattern is near omni-directional in three dimensions, with less than 2.6 dB gain deviation in all directions. The antenna is comprised of an open-loop radiating element, which is excited by a small loop. The minimum and maximum read ranges of the implemented RFID tag are approximately 2.3 and 2.6 m, respectively. Comparison between the simulated and measured results for the radiation and read patterns are shown to be in good agreement. 相似文献
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针对超高频抗金属射频识别(RFID)标签的小型化和低剖面需求,提出了一种可用于金属表面的超高频RFID标签天线,其尺寸为50 mm×20 mm×0.9 mm。该设计采用CST MWS软件进行建模仿真,分析了嵌入式馈电结构尺寸变化和矩形开槽尺寸变化对标签天线输入阻抗的影响,并调整相应参数以达到标签天线输入阻抗与芯片阻抗的共轭匹配。实测结果表明,标签天线输入阻抗与芯片阻抗匹配良好,在910 MHz处有最大实测阅读距离为4.3 m,且具有小尺寸和低剖面,可应用于物流、医疗、零售等多种领域的金属场景。 相似文献
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为快速完成超高频(UHF)标签天线多目标设计,构建了基于双向长短期记忆(BiLSTM)神经网络的新型天线性能预测代理模型,并使用带精英策略的非支配排序遗传算法(NSGA-II)配合静态惩罚对RFID标签天线进行多目标寻优。首先按照RFID标签天线延伸的趋势将天线结构序列化并依次输入BiLSTM网络结构,结合响应集训练出适用于RFID标签天线的代理模型。进一步地,为最大程度搜索可行域内,尤其是可行域边界的所有标签天线形式,在NSGA-II算法中引入静态惩罚,最终完成RFID标签天线低回波损耗、小型化、宽频带的多目标快速设计。设计实例表明,该方法在超高频RFID标签天线领域的预测精度、计算代价等方面综合表现优于现有天线设计方法,具有适用性和实用价值。 相似文献
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Wonkyu Choi Jeong‐Seok Kim Ji‐Hoon Bae Gil‐Young Choi Cheol‐Sig Pyo Jong‐Suk Chae 《ETRI Journal》2008,30(4):597-599
This letter presents the design of a small and low‐profile RFID tag antenna in the UHF band that can be mounted on metallic objects. The designed tag antenna, which uses a ceramic material as a substrate, consists of a radiating patch and a microstrip line with two shorting pins for a proximity‐coupled feeding structure. Using this structure, impedance matching can be simply obtained between the antenna and tag chip without a matching network. The fractional impedance bandwidth for S11<3 dB and radiation efficiency are about 1.4% and 56% at 911 MHz, respectively. The read range is approximately from 5 m to 6 m when the tag antenna is mounted on a metallic surface. 相似文献
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Leung S.Y.Y. Lam D.C.C. 《Electronics Packaging Manufacturing, IEEE Transactions on》2007,30(3):200-205
The performance of flexible printed RFID tags affixed onto cylindrical containers is dependent on the inductive behavior of the bent antenna on the tag. Conductive polymeric coil antennas were screen printed onto flexible substrates, and the coil resistances, the inductances, and the S-parameters of the antenna coils were measured and analyzed. The RFID dies were mounted onto the antenna coils and the read ranges were characterized as a function of curvature. The results show that the coil inductance decreased slowly with increasing curvature, and the maximum read range of the tags was markedly reduced with the curvature. The decrease in the coil inductance and the maximum read range were hypothesized to vary with the projected bent coil area instead of the geometric coil area. Experimental results confirmed that the maximum read range of an RFID tag affixed on a curvilinear surface can be predicted by the classical inductive coupling model with the bent projected coil area. On the basis of the experimental and analytical results, a reading reliability factor of two is proposed as a design parameter for flexible RFID tags. 相似文献