• Title/Summary/Keyword: UHF antenna

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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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Effect Analysis of Surface-Icing on the UHF-band Antenna for Space Launch Vehicle (우주발사체용 UHF-대역 안테나의 표면결빙에 의한 영향분석)

  • Hwang, Soosul;Oh, Changyul;Ma, Keunsu
    • Journal of Satellite, Information and Communications
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    • v.9 no.3
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    • pp.104-108
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    • 2014
  • This paper represents the effect analysis results of surface-Icing on the UHF-band antenna for Space Launch Vehicle. In order to obtain structural model of the surface-icing, Relative Permittivity of ice at $-180^{\circ}C$ was extracted. Using this surface-Icing model, UHF-band antenna simulation and comparative analysis about the antenna parameters such as resonance frequency, reflection loss and radiation pattern were performed for each case of with or without surface-icing. Simulation results show that resonance frequency is shifted out of operation frequency due to the additional ice permittivity. This resonance frequency changes cause severe affect to the antenna performance and its radiation pattern.

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.

Performance Analysis of Passive UHF RFID based Object Localization under Various Reader Antenna Locations (리더 안테나 위치에 따른 수동형 UHF RFID 기반 위치인식 성능 분석)

  • Choi, Jae Sung;Son, Byung Rak;Kim, Ju-Gon;Lee, Dong Ha
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.648-650
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    • 2015
  • In this research, we investigate an influence of a reader antenna location in Passive UHF RFID system based Object localization. When the localization system uses stationary RFID reader system, the performances of the system are significantly varied depending on the deployed antenna conditions due to its external environment such as reflection by the ground and obstacles. In this research we deeply study the RF conditions and differentiation with various antenna location. According to the empirical results, the localization system shows the best performance, where the reader antenna locates 1.5m from the target area of interest.

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Development of UHF Band antenna for Integrated Communication (통합마스트 통합통신용 UHF 대역 안테나 개발)

  • Jung, Kwang-Sik;Lee, Jong-Hak;Kim, Young-Wan;Ra, Young-Eun;Jeon, Jung-Ik
    • Journal of IKEEE
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    • v.24 no.2
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    • pp.453-460
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    • 2020
  • This paper, UHF band integrated communication antenna for ship communication is designed as a flat type that can be mounted on the integrated mast among integrated communication antennas such as integrated communication, ship communication, broadcasting, and telephone of the ship. The unified mast mounted antenna is an integrated communication antenna applied to the Navy's KDDX, which is an optimized type of integrated communication antenna including a 'composite slope' structure including operational capability, survivability, and improved operability and maintainability. The existing rotary radar and a plurality of monopole-type communication antennas were changed from an irregularly attached shape to the mast exterior to an integrated mast shape including a flat-type integrated communication antenna. the radar reflection area index (RCS) is significantly lowered and compared to overseas products. The goal is to develop a gain broadband antenna.

A Single-Feeding Port HF-UHF Dual-Band RFID Tag Antenna

  • Ha-Van, Nam;Seo, Chulhun
    • Journal of electromagnetic engineering and science
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    • v.17 no.4
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    • pp.233-237
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    • 2017
  • In this paper, a dual-band high frequency (HF) and ultra-high frequency (UHF) radio-frequency identification (RFID) tag antenna is presented that operates in the 13.56 MHz band as well as in the 920 MHz band. A spiral coil along the edges of the antenna substrate is designed to handle the HF band, and a novel meander open complementary split ring resonator (MOCSRR) dipole antenna is utilized to generate the UHF band. The dual-band antenna is supported by a single-feeding port for mono-chip RFID applications. The antenna is fabricated using an FR4 substrate to verify theoretical and simulation designs, and it has compact dimensions of $80mm{\times}40mm{\times}0.8mm$. The proposed antenna also has an omnidirectional characteristic with a gain of approximately 1 dBi.

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.

UHF RFID Dipole Tag Antenna Design Using Flexible Electro-Thread (도전사를 이용한 UHF RFID 다이폴 태그 안테나 설계)

  • Kim, Yeon-Ho;Chung, You-Chung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.1
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    • pp.1-6
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    • 2008
  • A wearable T-matching dipole UHF RFID tag antenna has been designed using conductive electro-thread. The conductivity of the electro-thread has been measured depending on the number of twisted thread. The measured conductivity has been used for simulation to have accurate simulation results. The flexible electro-thread or fabric has been used for fabricating the antenna instead of using copper tape since the electro-thread is more flexible and wearable than copper tape. The return loss and reading range of the fabricated electro-thread UHF RFID tag antennas have been tested. The reading range is approximately 2.4 m.

Design of High Sensitive Broadband Tag Antenna for RFID System in UHF Band (UHF 대역 RFID 시스템용 고감도 광대역 태그 안테나의 설계)

  • Park, Gun-Do;Min, Kyeong-Sik
    • Journal of Navigation and Port Research
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    • v.33 no.1
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    • pp.51-56
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    • 2009
  • This paper presents the design of high sensitive/broadband tag antenna for Radio Frequency Identification (RFID) in Ultra High Frequency(UHF) band. A proposed tag antenna size is $60\;mm\;{\times}\;10\;mm\;{\times}\;1\;mm$. The resonant frequency is 910MHz and bandwidth is about 900 MHz at -10 dB below. The measured return loss and directional pattern have been confirmed a good agreement with the calculation results. The read range of proposed tag antenna with chip is observed about 6.5 m and proposed tag antenna has been observed an average 0.5 m for more than read range of the commercial tag antenna.

Design and Analysis of UHF-GPS Antenna for Autonomous Underwater Vehicles (자율무인잠수정용 UHF-GPS 안테나 설계 및 해석)

  • Sang-Jin Park;Yeong-Jun Jo;Dong-Hyun Seo;Lin-Keun Park
    • Journal of Advanced Navigation Technology
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    • v.26 no.6
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    • pp.464-473
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    • 2022
  • In this paper, about a lightweight design that satisfies the performance of UHF-GPS Antenna used in autonomous underwater vehicle is proposed. Structural analysis, watertight external pressure test and non-destructive testing used in the design process are decided in consideration of structural safety for operating external forces in the underwater environment. First, the material of radome is selected for the performance of the UHF-GPS Antenna for communication with the carrier on the underwater operation in consideration of the 20 bar pressure generated. And the material of radome as PA-GF is selected by conducting electromagnetic field analysis and structural analysis and by considering high strength, rigidity and high dielectric constant. Electromagnetic field analysis and structural analysis by the thickness of radome are additionally performed in order to satisfy the required weight of UHF-GPS antenna. After selecting the final model, its structural safety is verified through watertight external pressure test and non-destructive testing.