共查询到18条相似文献,搜索用时 156 毫秒
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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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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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设计了一款超薄的高增益UHF抗金属标签天线。标签天线以高介电常数的陶瓷为介质基板,由上层带有双T 型槽缝的金属贴片、介质基板和下层金属贴片组成,天线平面尺寸为80 mm×40 mm,厚度仅为0.8 mm。天线结构简单,不需要短路通孔、短路销钉或短路贴片将天线上层贴片与地板相连,通过改变天线上层贴片T 型槽缝的尺寸,可以对标签天线阻抗进行有效调节,并实现天线的低剖面。天线未加金属地板最大增益为3.4 dBi,加载金属地板最大增益为6.9 dBi,且加载金属地板前后天线的中心频率和阻抗带宽无明显变化。实际测试结果与仿真结果比较吻合,实测未加载金属地板状态下最大识别距离为4.5m,加载金属地板状态下实测最大识别距离为6.8 m。 相似文献
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根据国家863计划“先进制造技术领域射频识别(RFID)技术与应用重大项目”2006年度相应课题要求,本文通过讨论被动式射频识别标签,并基于一个实用的应用对象的UHF标签天线设计方案的仓库贷箱跟踪应用,研究不同电介特性、机械特性等因素对标签天线性能的影响,以及不同应用背景的标签天线结构,标签天线的等效电路模型及其模型参数的提取方法、设计要求等,归纳出一个一般的设计处理和测量技术,为RFID标签天线结构优化、快速设计提供技术支撑;以及通过研究天线的电磁场建模及快速求解算法,标签天线的校准和测试方法,提出标签天线的匹配特性和方向图测试方案,为RFID标签天线设计和大批量生产提供验证手段。 相似文献
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提出了一种超小型UHF频段无源RFID标签抗金属环境的技术方案。采用高介电常数介质并通过开槽增加电长度,设计中考虑了环境金属物体对标签天线的影响,采用CST MWS软件建立模型并分析了标签天线主要尺寸的变化对标签天线阻抗与所采用的RF芯片阻抗的匹配影响,对造成阻抗变化明显的变量进行调整以获得可接受的阻抗匹配程度。采用网版印刷银浆制作了标签样品并进行实际测试。实验结果表明:实测与仿真结果比较吻合,标签阻抗匹配良好,实测读取距离大于2m满足实际使用需要,标签尺寸仅为12mm×7mm×3mm,可应用于物联网中小型金属物件的管理。 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刀数量的有效监测,设计了一款可应用于手术刀的小型化超高频(UHF)抗金属射频识别(RFID)标签天线。该天线采用短路短截线结构,可嵌入金属或贴敷于金属表面。标签天线由辐射面、短路短截线、金属地面以及标签芯片构成,通过采用高介电常数介质基板达到天线小型化的目的,通过对天线辐射面、短路短截线及开口尺寸的调整,可实现对天线谐振频率以及天线特性阻抗的调节。天线总体尺寸为66mm×5mm×0.8mm。标签天线嵌入手术刀柄中最大读写距离为1m。根据仿真优化结果加工制作天线实物,该标签天线的测试数据与仿真结果比较吻合,测试结果表明该天线可应用于手术刀。 相似文献
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为辅助民用飞机机载设备管理,跟踪管理飞机的关键零部件,针对普通标签无法在机载氧气瓶上工作的问题,设计了一种小型化的抗金属标签天线。首先,基于短路短截线馈电结构设计了一种抗金属标签,实现了天线与标签之间的阻抗匹配;其次,通过仿真优化,将天线放置在200 mm×200 mm金属环境下仿真,得到回波损耗小于-10 dB带宽为范围为750~970 MHz(220 MHz),仿真结果表明标签天线有在金属环境下能够完全覆盖标准工作频段902~928 MHz。天线的最终尺寸为42.7 mm×16 mm×2 mm。仿真距离为3.7 m,满足飞机机载环境使用条件、符合低成本、宽频带的设计要求。 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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金属表面超高频RFID印刷标签天线设计 总被引:1,自引:1,他引:0
为满足对金属表面物体智能识读的应用需求,设计了一款可用于金属表面的超高频RFID电子标签天线,使用时将标签贴合在厚度仅为5mm的泡沫介质上,然后置于金属表面,利用金属表面作为自身反射板增加了天线的读取距离。整个天线的面积大小为95mm×45mm,标签的最远读取距离可达4.5m。同时由于表面印刷结构的采用,使得整个标签成本低廉、易于批量生产。 相似文献
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Jeong‐Seok Kim Wonkyu Choi Gil‐Young Choi Cheol‐Sig Pyo Jong‐Suk Chae 《ETRI Journal》2008,30(4):600-602
A very small patch‐type RFID tag antenna (UHF band) using ceramic material mountable on metallic surfaces is presented. The size of the proposed tag is 25 mm×25 mm×3 mm. The impedance of the antenna can be easily matched to the tag chip impedance by adjusting the size of the shorting plate of the patch and the size of the feeding loop. The measured maximum reading distance of the tag at 910 MHz was 5 m when it was mounted on a 400 mm × 400 mm metallic surface. The proposed design is verified by simulation and measurements which show good agreement. 相似文献
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One of the fundamental constraints in radio frequency identification (RFID) large scale deployment, such as in warehouse RFID deployment, is the positioning of RFID reader antennas to efficiently locate all the tagged objects distributed in a dense RFID reader environment. For tracking the tagged objects in a dense RFID deployment, the required number of reader antennas must be optimised in order to reduce the overall cost. This study proposes highly accurate square and hexagonal grid-based positioning and tracking techniques mainly for use indoors and includes performance comparison of both of these grids. The study involves the design of the square and hexagonal grid reader antenna networks and position calculation using a diffusion algorithm. Both of these grids of RFID antenna positioning present a solution for the problem of the placement pattern of RFID reader antennas in a dense reader environment, hence an optimal number of required reader antennas and guaranteed coverage can be achieved. This study also presents a path loss model that can be applied to predict the radio signal strength information at a certain distance. The proposed diffusion algorithm estimates RFID tag position by using distance information between the reader and the tag. The obtained results show that a square grid can yield higher positioning accuracy compared to the hexagonal grid. The obtained results further show that the proposed tracking techniques can achieve an average positioning error below 1 m, which is 85% better in some cases than the results obtained by other known methods. 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