• 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.

• 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.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.10
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• pp.1114-1120
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• 2009

The conductivity of various electro-threads is analyzed, and the washable electro-thread embroidery UHF RFID tag antennas using the character shape without T-matching structure are designed by adding a T-matching structure. The RFID tag antenna using the electro-thread is easy to be embedded on a cloth as a wearable antenna because it is flexible and different from general copper inlay shape and tape type tag. The embroidery tag antennas are designed with the English alphabet 'F' and the Korea alphabet 'ㄹ' character. Those are easy to be applied to general clothes. The parameters of antennas are optimized and fabricated. The characteristics and the reading range patterns of the tag antennas are measured. The reading ranges of wet tags(tap water, sea water and soapy water) are tested and compared.

• 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.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.1
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• pp.41-49
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• 2007

RFID in which subminiature IC chip with the indentified information is built a core technique that can recognize, trace and manage various information of an object using radio frequency in the age of Ubiquitous. Several pressing matters about an infringement of Privacy and a security of private information should be settled as soon as possible because an information of specific circumstance can be collected and used without any awareness by others as well as a private information. In addition, various algorithms with high level of security, which is normally used in wire, can be hardly applied to RFID tag because of a lot of restrictions of tag. In this report, designed-RFID tag based on the standard of ISO/IEC 18000-6 and the problems which originated from the technical procedure of that design were analyzed, and the algorithm which could be applied to the designed-tag was also investigated.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.1
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• pp.122-128
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• 2010

RFID is method used on wireless system. However, this mechanism is not used for authentication and security. Therefore, it is very vulnerable to attacks such as dropping attacks and traffic attacks. the RFID Tags are of the limited nature due to environment factors and there is greater constraints in designing authentication protocol. If we do not RFID to secure corporate information and product all the information will be exposed. The attacker will break into the RFID system and stop the distribution system. So, this paper proposes a new authentication protocol which provides not only unlimited access to Tag and Reader of mobile and connection between Tag and Reader bet also provides authentication mechanism by defining the key distribution.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.8
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• pp.1943-1949
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• 2010

In this paper, we developed a RFID tag antenna using one-sheet inlay pattern which consist of two different frequencies in one layer. The antenna in one-sheet inlay RFID tag does not use different kind RFID antennas in a card but implement 13.56MHz and 900MHz RFID tag antennas in one sheet. In order to evaluate the usability of proposed method, we configured test equipments and designed 6 different patterns and test the recognition distance of each pattern. Among the one-sheet inlay RFID tag antenna designs, the pattern no.5 has good performance with recognition distance of 5.34m at 900MHz and 3.5m at 13.56MHz.

• 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.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.2
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• pp.249-254
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• 2014

We have studied on the possibility of railway stability system using RFID tag. UHF RFID tag was desinged, manufactured and tested. Proposed UHF tag antenna has PIFA type structure and inset feed multi matching technique was attempted for impedance matching of antenna. The impedance bandwidth (VSWR < 3) of the proposed tag antenna covers 917~923 MHz. Measured peak gain is 3.225 dBi and UHF band with an omni-directional radiation pattern. RFID reader and tag installed in motor car and track, respectively. Then, tag recognition rate according to velocity of car (under 45 km/h) represented 100 %.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.5
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• pp.450-459
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• 2009

RFID technologies, which allow collecting, storing, processing, and tracking information by wirelessly recognizing the inherent ID of object through an attached electronic tag, have a variety of application areas. One of the important parameters in designing such RFID systems is the read range within which the system recognizes the electronic tag. We present a novel method of designing an RFID tag required for long read range of RFID systems. The tag designed by the proposed method is battery-assisted to increase its forward-link read range and simultaneously, has backscattering modulation amplified to increase its reverse-link read range. We experimentally confirm that the minimum threshold power of the tag is - 23 dBm and the backscattering modulation gain is 28 dB, which is consistent with our simulation results. We also verify that the tag in this paper improves more than 2 times in terms of the read range compared to the existing commercial tags.