• Title, Summary, Keyword: UHF RFID tag antenna

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UHF & HF RFID Credit Card Size Tag Antenna Designs Using Silver-Ink and Jumper Structure (실버잉크와 점퍼구조를 사용한 신용카드 크기의 UHF & HF RFID 태그 안테나)

  • Nam, Sehyun;Chung, Youchung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.11
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    • pp.972-977
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    • 2016
  • This paper introduces development process and results of HF & UHF band(13.56 MHz, 920 MHz) tag antennas using a single-side printing method on a PE film. The size of tag antenna is designed in the area of $80mm{\times}50mm$, little bit smaller than a credit card. The UHF tag antenna, $76mm{\times}44mm$, is located at the outside of the card size tag antenna, and the HF tag antenna, $40 mm{\times}42 mm$, is located at the center of the UHF tag antenna. The UHF and HF tag antennas are designed with consideration of coupling effects. The single-side printing method with a jumper structure without using a via is used to make a loop antenna of HF tag antenna. The reading range of UHF tag antenna is about 6m, and the reading of HF tag antenna is about 5 cm. The designed tag antennas have long enough reading ranges for both bands. The tag is applicable to logistics and authentification.

Bolt Shape UHF RFID Tag Antenna for Insertion to a Tree (생목 삽입용 볼트 모양의 UHF RFID 태그 안테나 설계)

  • Chung, You-Chung;Jeon, Byung-Don
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.2
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    • pp.270-273
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    • 2012
  • A plastic bolt shape UHF RFID tag has been developed for a live tree. The UHF tag is designed and installed into the head part of the bolt, inserted into a tree for management of tree. If the tag antenna is installed near the high dielectric constant material, the impedance of the tag antenna will be changed, and the tag does not work. Therefore, the dielectric constants of wood and plastic bolt are considered for tag antenna design. The input reflection coefficient characteristics and the reading range patterns are measured and compared. This UHF RFID tag can be applied into a live tree, and the status and location of tree can be controlled with the RFID tag. This developed UHF tag can be applied to any applications and objects using a bolt.

Bar-Code Shape UHF RFID Tag Antenna (바코드 모양의 UHF RFID 태그 안테나 설계)

  • Jeon, Byung-Don;Chung, You-Chung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.1
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    • pp.131-134
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    • 2012
  • A bar-code shape UHF RFID tag antenna is designed and fabricated with silver conductive ink. It can be recognize by both bar-code scanner and RFID reader. The bar-code shape is taken from a general box of a product, and the product code of the bar-code is used for the antenna design. The tag antenna is fabricated with silver conductive ink using a T-matching structure. The designed tag antenna is satisfied with bar-code system and RFID system simultaneously. The input reflection coefficient characteristics and the reading range pattern are measured. The peak reading range is about 111 cm, which is long enough.

A Circular UHF RFID Tag Antenna Design (UHF 대역의 원형 RFID 태그 안테나 설계)

  • Kim, Goo-Jo;Kim, Sinh-Hwan;Chung, You-Chung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.3
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    • pp.282-287
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    • 2007
  • A circular UHF RFID tag has been designed. This circular tag antenna can be optimized simply by controling two parameters, outer radius and inner radius of the tag antenna. The resistance and resistance values of the tag antenna have been researched based on the variation of inner and outer radii of the circular tag antenna. The simulation and measurement results are compared.

Necklace Type UHF RFID Tag Antenna for the Material with High Dielectric Constant for a Tree (고유전율에 적합한 목걸이 형태의 생목용 UHF RFID 태그 안테나 설계)

  • Chung, You-Chung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.1C
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    • pp.34-37
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    • 2012
  • The paper introduces the an necklace type UHF RFID tag for a live tree having high dielectric constant. When a general UHF RFID tag is used for the metal and the material with high dielectric constant, the electrical characteristics and impedance of antenna have been changed, and the tag is not recognized by an UHF RFID reader. The necklace type UHF RFID tag has been designed with consideration of the high dielectric constant of the tree material. The name tag for a live tree has been designed with the developed tag antenna. The performance of tag has been measured and the reading range is about 4~5m. The developed UHF RFID tag antenna can be applied to any high dielectric material for various industrial applications.

Conductive Fabric UHF RFID Tag Antenna Design (전도성 천을 이용한 UHF RFID 태그 안테나 설계)

  • Kang, Juwon;Chung, Youchung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.30 no.3
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    • pp.209-214
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    • 2019
  • This paper presents the design of a 920 MHz ultra-high frequency(UHF) band radio frequency identification(RFID) conductive fabric tag antenna. The resistance values of four different conductive fabrics are measured, and the conductivities of the fabrics are calculated. The fabric with the best conductivity is selected, and the best conductivity of the fabric is used to simulate the fabric tag antenna design. The fabric UHF RFID tag antenna with a T-Matching structure and name-tag size of $80{\times}40mm$ is simulated and designed. The simulated and measured results are compared, and a laundry test is performed. The reading range of the fabric tag antenna is about 2 m. This fabric tag can be easily applied to an entrance control system as it can be attached to other fabrics and cloths.

UHF RFID Tag Using National Code in a Bar-code Using Conductive Ink (도전성 잉크를 사용한 바코드의 국가코드 모양 UHF RFID 태그 안테나)

  • Chung, You-Chung;Jeon, Byung-Don
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.2C
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    • pp.168-172
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    • 2012
  • An UHF RFID tag is designed and fabricated using the national code in a bar-code with conductive ink. The bar-code sample was taken from a general bar-code from a general box. The conductivity of the conductive ink was measured, and the measured conductivity was used for the simulation tool to design the printed bar-code shape tag antenna. The tag antenna was fabricated using T-matching to reduce the size of the tag, and the bar-code tag antenna is recognized by both a general bar-code reader and an UHF RFID reader. The input reflection coefficient characteristic, the reading range pattern and the reading rate of the tag antenna are measured.

A Study on Detecting System of Illegal Automobile Using a Seal-Bolt UHF RFID Tag Antenna (봉인볼트용 UHF RFID Tag Antenna를 이용한 차량인식에 관한 연구)

  • Chung, You Chung;Kim, Ki-sik;Seol, Chang-hwan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.1
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    • pp.157-161
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    • 2017
  • This paper introduce UHF miniaturized RFID tag antenna which is embedded on the seal-bolt or plastic bolt for automobile plate. To detect the illegal and un-registered car, the illegal automobile detection system has been developed using the seal-bolt UHF RIF tag antenna. The diameter of seal-bolt UHF tag is about 24mm, almost the same size as 100 Won coin. The simulated and measured reflection coefficient are compared, and the reading range patten is also measured. If seal-bolt tag is embedded on car plate, police can get information of automobile and detect illegal vehicles easily with the illegal automobile detection system.

Long Reading Range Yagi-Uda UHF RFID Tag Antennas with Small Back-Lobe (후엽이 작은 장거리 인식용 Yagi-Uda UHF RFID 태그 안테나 설계)

  • Lee, Kyoung-Hwan;Chung, You-Chung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.11
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    • pp.1211-1216
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    • 2007
  • Yagi-Uda UHF RFID(Radio Frequency Identification) tag antennas with long reading range have been designed. According to ISO-18000, EIRP(Effective Isotropic Radiation Power) of reader and reader antenna is limited as 36 dBm. Therefore, the gain of a tag antenna should be high enough to extend the reading range. Yagi-Uda antenna has been applied to a UHF RFID tag antenna, and high gain and long reading range have been achieved. Three different of Yagi-Uda UHF antennas have been optimized to achieve the small size with low back-lobe patterns. The sizes, reading ranges and return loss of Yagi-Uda tag antennas are compared and measured.

Design of an Ultra-Compact UHF Passive RFID Tag Antenna for a Medical Sample Tube

  • Lee, Jung-Nam;Hwang, Moon-Young;Lee, Sang-Il;Lee, Kwang-Chun;Park, Jong-Kweon
    • ETRI Journal
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    • v.34 no.6
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    • pp.974-977
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    • 2012
  • In this letter, a small-sized ultra-high frequency (UHF) RFID tag antenna for a medical sample tube is proposed. The RFID tag antenna is designed and fabricated based on the circular loop antenna used in the UHF band (Korea standard, 917 MHz to 923.5 MHz). The tag antenna size is reduced using a circular meander stub. The antenna has a physical size of 8 mm, which is about ${\lambda}$/40 in electrical length. The proposed tag antenna is molded into a medical sample and multitag identification is performed.