THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 9, Sep [1]. RFID.,,,,,,, /,,, (,,,, ) [2] [4].., ( 99

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 28(9), ISSN (Print) ISSN X (Online) UHF Long Range Small Cavity UHF RFID Tag Antenna Design for a Metal Cart 프랑크키메탸 설창환 정유정 Frank Kimetya Chang-Hwan Suel Youchung Chung 요약 UHF(Ultra High Frequency) RFID(Radio Frequency Identification) mm 3,,..,,. LP(Linear Polarization) 12m, CP(Circular Polarization) 10 m. 920 MHz UHF RFID. Abstract This paper presents an UHF(Ultra High Frequency) band small cavity structured RFID(Radio Frequency Identification) tag antenna with a long reading range, designed to apply on metal cart or pallet for auto-parts logistics. The size of tag antennas is mm 3, attached on a exporting metal cart, and it can give the information of inventory and logistics of carts. By collecting the exported carts and increasing the recovery rate of missing carts or pallets, the paid import tax can be refunded when the carts are returned back to the manufacture. The tag antenna was equipped with a cover to prevent damage, and the dielectric constant of the cover is considered for the simulation. The reading range of the tag antenna is 12 m using LP(Linear Polarization), 10 m with CP(Circular Polarization) reader antennas. This 920 MHz UHF RFID cavity tag ensures the long reading distance of the antenna regardless of the material of the object where it is attached. Key words: UHF RFID, Long Range RFID Tag, Cavity Metal Tag, Tag for Pallet. 서론 RFID(Radio Frequency Identification) RFID,,.,. UHF RFID( MHz) RFID chip, (electromagnetic wave) (back scattering). (Department of Information and Communication Engineering, Daegu University) Manuscript received May, 8, 2017 ; Revised July, 3, 2017 ; Accepted September, 4, (ID No ) Corresponding Author: Youchung Chung ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 679

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 9, Sep [1]. RFID.,,,,,,, /,,, (,,,, ) [2] [4].., ( ).,. RFID UHF, [5].. [ 4] [7]. [6], [7] mm mm 3, m,, 3. [8], [9] bowtie RFID, bowtie RFID AMC(Artificial Magnetic Conductor) 890 MHz 12 m,. cavity, ABS,.. 메탈용장거리태그안테나설계 UHF RFID 915 MHz 920 MHz mm 3, CP(Circular Polarization) 10 m. 1 cavity (ε=1.01), Cavity, 30 mil 3.2 RF, ABS. ant_w=63, ant_h=7, tmat_h=1, tmat_w=65, loop_w=5, loop_h=32, port_w=2.2, Plastic_w=177, Plastic_h= 64 mm, Cavity_L 10. Simulation S MHz. RFID Alien Higgs MHz Higgs3, 915 MHz. 2 cover. cover ABS Agilent 85070E (a) (a) Side view (b) (b) Front view 그림 1. Cavity Fig. 1. Structure of the cavity tag antenna. 680

3 UHF 그림 2. ABS (3D ) Fig. 2. ABS material tag cover(3d model). 그림 4. Simulation Fig. 4. Measured and simulated S 11. dielectric simulation. 3 cavity parameter sweep. 1 ant_w 61, 62, 63, 64, 65 parameter sweep cavity simulation network analyzer. Higss3 (1). 920 MHz S db 915 MHz 10 db, 920 MHz 그림 3. tmat_w S 11 Fig. 3. S 11 vs. size of tmat_w db, 915 MHz 12 db. 3 db 905 MHz 945 MHz 40 MHz. Γ = (1) :, : Cavity cavity_l 2, 4, 6, 8, 10 mm Parameter Sweep 10., 0.17 db, 0.5 m. 5. 1, cavity. 920 MHz 6.38 db. 6 cavity., Alien ALR 9900 ( 6 dbi) Alien RFID program. 6 dbi LP 12 m, CP 10 m 681

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 9, Sep 인 것을 확인할 수 있다. 그림 7은 CP안테나로 측정한 인식 거리 패턴을 theta (방향), phi(방향)으로 보여주는 그림이다. 인식 거리 theta 구조 안테나 이득패턴 그림 5. Cavity (simulation) Fig. 5. Cavity structure antenna gain pattern. 방향 인식 거리는 그림에서 보듯이 제작한 태그는 0도에 서 약 10 m의 인식 거리를 보이고 있으며, Phi 방향 인식 거리는 제작한 태그는 0도에서 약 10 m의 인식 거리를 보 이고 있다. 그림 8에서는 태그 안테나가 금속카트( m) 에 밑에 부분에 부착되며, 금속 카트에 부착되었을 때와 미부착시에 인식거리가 같음을 확인하였다. 측정된 안테나 인식 거리 패턴 그림 7. Fig. 7. Measured antenna reading range pattern. 정면 (a) (a) Front view 뒷면 제작된 (b) (b) Bottom view 태그 안테나 그림 6. cavity Fig. 6. Fabricated cavity tag antenna. 682 철제 카트 모습과 태그가 부착된 모습 그림 8. Fig. 8. Metal cart shape and attached tag on the cart.

5 UHF. 결론 UHF (915, 920 MHz) cavity,, mm 3 cavity, LP 12 m, CP 10 m..,., References [1] K. Finkenzeller, RFID Handbook, 2 nd Edition, John Wiey & Sons, England, [2],, " UHF & HF RFID ",, 27(11), pp , [3],, " UHF RFID ",, 23(2), pp , [4],,, "UHF RFID ",, 16(2), pp , [5] B. F. Kimetya, S. Choi, J. Kim, J. Kim, and Y. Chung, "Smart school-food materials inspection and logistic system using intelligent HF/UHF RFID smart box",, pp , [6],,, UHF RFID,, 4(12), pp , [7] D. Kim, J. Yeo, "A passive RFID tag antenna installed in a recessed cavity in a metallic platform", IEEE Trans. on Antennas and Propagation, vol. 58, no. 12, pp , Dec [8] D. Kim, J. Yeo, "Dual-band long-range passive RFID tag antenna using an AMC ground plane", IEEE Trans. on Antennas and Propagation, vol. 60, no. 6, pp , Jun [9] D. Kim, I.-Y. Park, "Artificial magnetic conductor loaded long-range passive RFID tag antenna mountable on metallic objects", Electronics Letters, vol. 50, no. 5, pp , 27th Feb Byondi Franck Kimetya : : Daegu University ( ) : Daegu University ( ), :, TA & RA [ 주관심분야 ], RFID, EMC : ( ) : : : IT IT : [ 주관심분야 ] RFID, 683

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 9, Sep : ( ) 1994 : University of Nevada, Reno ( ) 1999 : University of Nevada, Reno ( ) : Utah State University, ECE Dept : University of Utah ECE Dept : 2004 : IEEE Senior Member : Associate Editor of International Journal of Antenna Propagation (IJAP) [ 주관심분야 ] RFID,,,,, RFID 684

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