• Title/Summary/Keyword: UHF RFID tag antenna

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Planar Square-spiral Antenna using a strip conductor (도체스트립을 이용한 평판사각 스파이럴 안테나)

  • Yang, Doo-Yeong;Lee, Min-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.5
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    • pp.2325-2331
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    • 2012
  • Planar square-spiral antenna using a strip conductor is proposed and analyzed for RFID system in UHF band operating from 860MHz to 960MHz. By varying the length of common line, detached distance, strip line-space, strip line-width and the number of spiral turn, the optimized antenna are designed and fabricated in compact size without a matching-stub between the input port of the proposed antenna and RFID tag chip. From the optimized results, the frequency bandwidth in VSWR<2 has covered 100MHz in the RFID UHF band. The antenna gain has obtained 3.5dBi at the center frequency of 910MHz and the desired beam pattern has shown directional pattern on elevation and azimuth angle. Therefore, the proposed antenna is suitable for practical RFID applications requiring various tag chips with the specific input impedance.

A Study of UHF RFID Metallic Tag Design for Long Reading Range Using a Cavity Structure (캐비티 구조를 사용한 장거리 인식용 UHF RFID 금속용 태그 설계에 관한 연구)

  • Lee, Jin-Seong;Lee, Kyoung-Hwan;Yeo, Jun-Ho;Chung, You-Chung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.12B
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    • pp.1468-1474
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    • 2009
  • This paper shows an UHF RFID metallic tags using a Cavity structure for a long reading range. The reading range of a general passive tag is limited because the EIRP of a reader system is limited as 36㏈m by ISO 18000-6. To extend the reading range, the tag antenna should have a high gain antenna structure. The designed tag antenna is recognized over 10m range with a Cavity structure. The directivity pattern and the performance of the tag with the Cavity structure is stable when it is attached to a metallic object. The designed tag antenna has two kinds as cavity thickness. The sizes of designed tag antennas are $176\;{\times}\;52\;{\times}\;10\;mm$ and $176\;{\times}\;61\;{\times}\;30mm$ They can be attached to a large metallic materials and heavy equipments. The measured reading ranges of the tags are about 11m and 15m when they are attached to a metallic object.

Comparison of the Characteristic of Multiple Meander-Line RFID Tag Antennas (광대역 특성을 갖는 다중 미앤더 형태의 RFID 태그 안테나 특성 비교)

  • Jung, Hak-Joo;Lee, Sang-Woon;Choo, Ho-Sung;Park, Ik-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.12
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    • pp.1438-1446
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    • 2010
  • In this paper, we compared and analyzed the antenna characteristics such as bandwidth, efficiency, and readable range in terms of the size and the number of turns of the multiple meander RFID tag antenna in the UHF band. The sizes of the each antenna are $20.0{\times}19.7$, $25.0{\times}24.8$ and $30.0{\times}29.7\;mm^2$. The bandwidths of the antennas for VSWR<5.8 are 857~963 MHz, 844~965 MHz, and 844~968 MHz which cover the worldwide UHF RFID bandwidth. The readable range of the antenna was greatly affected by the efficiency and gain of the antenna which depends on the size and the number of turns of the meander antenna.

A Study on Animal Information Management System (AIMS) Using an Insertion Type UHF RFID Tag (체내 주입형 UHF RFID 태그를 이용한 동물정보관리 시스템에 관한 연구)

  • Chung, You-Chung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.12B
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    • pp.1680-1685
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    • 2011
  • This paper introduces UHF RFID tag antenna which can be inserted between the skin and muscle of animal. Animal Information Management System (AIMS) using the developed tag has been developed. Since the general and commercial tags are not working in the body of any animal, the new tag for flash body has been developed with the consideration of dielectric constant of the muscle and fat of animal. The tag shape is flat and sharp end to make it easy to insert the tag just under the skin. The performance of the installed tag under the skin and in the muscle has been verified. The AIMS can manage the animal, history of illness, information of owner and address. This program can be applied to the management of military and police dogs.

Design of a Circularly Polarized Antenna for UHF Band RFID Reader (UHF RFID 리더기용 원형편파 안테나 설계)

  • Chun, Jong-Hun;Han, Seung-Jo;Pyun, Jae-Young;Lim, Gyeong;Park, Jong-An
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.6 no.3
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    • pp.101-110
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    • 2007
  • This study has designed a circular polarization antenna for UHF bandwidth RFID reader. As a result of performance test of the antenna designed it is found that return loss (S11) is about -45.529dB at 914MHz, which is relatively small, and antenna gain is about 6.09dBi. It has also been confirmed that $50{\Omega}$ impedance matching is about $50.48{$\Omega}$ and it can be applied to every RFID reader. Therefore, the antenna is designed to have higher gain of circular polarization by improving reception, which is one of the most important parameters of RFID reader and is expected to be extensively used to recognize multi-tag in the distance.

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Impedance Evaluation Method of UHF RFID Tag Chip for Maximum Read Range (UHF RFID 태그의 최대 인식 거리를 얻기 위한 태그 칩의 임피던스 산출 방법)

  • Sim, Yong-Seog;Yang, Jeen-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.12
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    • pp.1148-1157
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    • 2013
  • In a passive UHF RFID system, the impedance matching between tag antenna and chip as well as the protocol parameter settings in a reader plays important role in determination of the maximum read-range. Almost no paper, however, has dealt with the above issues in relation with the maximum read range. In this paper, two known methods (of using the value from data sheets and proprietary RFID tester) and our proposing method in chip impedance evaluation are compared in terms of maximum read range. The read range of tags whose antenna impedance is conjugate matched with the chip impedance obtained from the proposed method is improved maximum 73 % more than that of tags from the other methods.

A Design of RFID Tag Antenna with High Sensitivity for Car Side Mirror (사이드 미러용 고감도 RFID 태그 안테나의 설계)

  • Han, Seung-Mok;Kim, Min-Seong;Min, Kyeong-Sik
    • Journal of Navigation and Port Research
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    • v.32 no.10
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    • pp.793-798
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    • 2008
  • This paper presents a design of RFID(Radio Frequency Identification} tag antenna which has high sensitivity for car side mirror. A proposed tag antenna ($154\;mm{\times}66\;mm{\times}1;mm$) resonants at 900 MHz and has a wide bandwidth of 690 MHz($490\;MHz{\sim}1180\;MHz$). The measured gain and readable range of tag antenna are 5.8 dBd and 10 m, respectively. Radiation pattern and readable range of proposed tag antenna located on inside of a side mirror including a car body are measured at anechoic chamber. It has been confirmed that the readable range in the vicinity of $90^{\circ}$ has been expanded about 1.5 m by comparison with one of proposed tag antenna without of car body. Good performance of the proposed tag antenna was observed and proved by comparison of measured results of commercial tag antenna.

Open-Ended Two-Strip Meander-Line Antenna for RFID Tags

  • Son, Hae-Won;Choi, Gil-Young;Pyo, Cheol-Sig
    • ETRI Journal
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    • v.28 no.3
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    • pp.383-385
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    • 2006
  • A new meander-line antenna consisting of two open-ended strips is proposed for a compact and broadband UHF radio frequency identification tag. An equivalent circuit model for the proposed antenna is derived and used to perform a simple and wideband impedance match to an arbitrary complex impedance of a tag chip without any additional matching network. The performance of the proposed antenna is validated by comparing calculated and measured results, which show good agreement.

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U-Shaped Broadband RFID Tag Antenna with a Parasitic Element (기생소자를 가지는 U-형태의 광대역 RFID 태그 안테나)

  • Lee, Sang-Woon;Cho, Chi-Hyun;Lee, Kee-Keun;Choo, Ho-Sung;Park, Ik-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.1
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    • pp.75-82
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    • 2009
  • In this paper, we proposed a U-shaped broadband RFID tag antenna with a parasitic element operating at UHF band. The proposed tag antenna consists of a U-shaped half wavelength dipole antenna and an inverse U-shaped parasitic element inside the U-shaped dipole antenna. In order to have good impedance matching, the commercial tag chip is attached to the lower center of the rectangular shaped feed. On the condition of VSWR<2, the tag antenna had the measured bandwidth of 4.96 % from 882 to 927 MHz and showed the gain deviation of less than 3.16 dB. On the condition of VSWR<5.8, the tag antenna satisfies the worldwide UHF RFID bandwidth and is showed the gain deviation of less than 5.07 dB. The minimum gain deviation characteristic appears near the center of bandwidth which minimizes variation of gain deviation characteristic with respect to the frequency.