THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 4, Apr [1]., ITO(Indium-Tin-Oxide),. [2] ITO 90 %, 50

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Apr.; 29(4), ISSN (Print) ISSN X (Online) Transparent Rectangular Patch Antenna Using Square Metal Mesh Transparent Electrode 강석현 정창원 Seok Hyon Kang Chang Won Jung 요약, (smart glass),, ITO(Indium-Tin-Oxide) (thin film type) ( >5 (Ω/sq)), (copper wire) (square metal mesh),,. ( ) ( ),,,., (w=0.2 mm), (mesh) (l=1, 2 mm) (, ).,,,,,. Abstractt This paper reports the transparent electrode, which would be applied to transparent displays and smart glasses. Herein, a squared metal mesh with the most widely used copper wire in microwaves is studied for the alternating thin-film-type transparent and conducting indium tin oxide(ito), with a low conductivity(sheet resistance > 5 Ω/sq.). The electromagnetic performance of a patch antenna with metal mesh is analyzed. This paper presents the results of the optical(ot, optical transparent) and electrical(sheet resistance) characteristics of a squared metal mesh, which is a basic design. To improve the OT, copper wire(w=0.2 mm) is used in fabricating the squared metal mesh and the relationship between the OT and the antenna performance(radiation gain, radiation pattern) was analyzed according to the mesh size(l=1, 2 mm). The measurement results show that the antenna performance and the optical characteristic are in inverse proportion to each other. In real applications, the optical and electrical characteristics, and the costs of production are to be considered. Key words: Transparent Electrode, Metal Mesh, Transparent Antenna, Patch Antenna, Optical Transmittance. 서론 (NASA). NID (Graduate School of NID Fusion Technology, Seoul National University of Science and Technology) Manuscript received January 2, 2018 ; Revised March 23, 2018 ; Accepted March 29, (ID No ) Corresponding Author: Chang Won Jung ( changwonj@seoultech.ac.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 277

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 4, Apr [1]., ITO(Indium-Tin-Oxide),. [2] ITO 90 %, 50 Ω/sq,, (, ), ITO [3],[4]. (Metal Mesh: MM), ITO,, [3],[5].,,. (Square Metal Mesh: SMM).,.,.. 정방형메탈메쉬의광투과도및전도도 2-1 정방형메탈메쉬의광학적특성 (FoM, Figure of Merit) (1) (OT, Optical Transmittance) (R S, sheet resistance),, [6] mm (w) 1 mm(l). 1(a) 1(b)., (2) OT. (1) (2) (2) %.,, 2. 2(a), 2(b). (2) 2(a) (b), % %., 3 (a) SMM (a) SMM transparent electrode (b) (w=0.2 mm, l=1 mm) (b) Structure of an unit cell(w= 0.2 mm, l=1 mm) 그림 1. (SMM) Fig. 1. Transparent electrode using square metal mesh (SMM). 278

3 정방형 메탈메쉬 투명전극을 이용한 투명 사각 패치 안테나 측정하였다. 투명 아크릴(acrylic) 기판은 두께 1 mm이고 전기적 특성은 유전율 ε=2.6, 손실 탄젠트 tan δ=0.009 이다. 측정 시 가시광선 영역은 nm이며, 비교분 석을 위해 455 nm(청), 535 nm(녹), 570 nm(적) 등 3원색 주파장을 기준으로 비교분석하였다. 측정된 투과도와 계 산된 투과도를 표 1과 같이 정리하였다. 투과도 측정값(experimental value)의 경우, 그림 4의 적 록청(RGB) 파장의 측정값을 표 1에 정리하였다. 계산된 투과도 값(theoretical value)에서 1 MM은 파장과 관계없이 위 식 (2)를 이용하여 계산되었으며, 아크릴의 투과도는 RGB 측정값의 평균인 약 %로 고정하였고, 이를 각 각의 아크릴(acryl)이 포함된 계산된 투과도 값에 곱해주 었다. Aligned 2 MM+acrylic의 계산된 투과도 값의 경우 는 광 투과가 SMM면에 수직 방향으로만 입사한다고 가 정하였을 경우, 1 MM+acrylic의 투과도 값(60.99 %)과 이 론적으로 같은 값을 가지며, 또한 misaligned 2 MM+acrylic의 경우는 이론적으로는 1MM+acrylic 투과도(60.99 %) 에 1MM의 투과도(66.29 %)을 곱해 주는 값과 동일하며, 계산된 값은 %으로 측정된 RGB 값과 유사한 값을 갖는다. r 정렬 (a) (a) Aligned 비정렬 (b) (w=0.2 mm, l=1 mm) (b) Misaligned(w=0.2 mm, l=1 mm) 겹쳐진 메탈메쉬의 구조 그림 2. Fig. 2. Structure of overlapped metal mesh. 메탈메쉬의 광 투과도 측정 그림 3. Fig. 3. Transparency measurement of metal mesh. 가시광선 투과스펙트럼(SCINCO S-3100)으로 그림 2의 두 가지 메탈메쉬를 측정하였다. 측정한 시료는 아크릴기판 (acrylic), 단층의 메탈메시(1 MM), 아크릴 기판 상부에 단 층 메탈메시(1 MM+acrylic), 아크릴 기판 상하부에 두 개의 메탈메시가 있는 상태이며, 이는 정렬(aligned 2 MM+ acrylic)과 비정렬(misaligned 2 MM+acrylic)로 두 가지를 제작 그림 4. 메탈메쉬와 아크릴기판의 다양한 조합에 따른 가시광선 투과도 측정 결과 Fig. 4. Measured optical transparency of various configurations of metal mesh and acrylic substrates. 279

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 4, Apr 표 1. Table 1. Summary of calculation and measurement results of optical transparency. (unit: %) DUT Wavelength (nm) Experimental value 445(B) 535(G) 570(R) Theoretical value Air Acrylic MM MM+acrylic Aligned 2MM+acrylic Misaligned 2 MM+acrylic , Aligned 2 MM+acrylic RGB % (60.99 %). Aligned 2 MM+ acrylic 1 MM+ acrylic (60.99 %) 1 MM (66.29 %) %, aligned 2 MM+acrylic RGB (39.42 %). MM (aligned), MM. 2. RGB, RGB. 2-2 정방형메탈메쉬의전기적특성 2. - (ECOPIA, HMS-3000). (Multi Layered Electrode Film: MLF, Micro Metal Mesh Film: MMF, Squared Metal Mesh: SMM) 표 2. Table 2. Conductivity and sheet resistance of electrodes. Electrode Conductivity(S/m) Sheet resistance(ω/sq) Copper [3] 5.00E E-04 MLF [3] 2.15E E+00 MMF [3] 1.51E E-02 SMM 1.59E E-03 10, MLF 2.15E+06(S/m), (100 nm) (MMF, SMM), 4.65E+00(Ω/sq) (MMF, SMM) 50 2,000., ( nm) MLF 81 %, MMF 62 % SMM 64 %. MLF, MLF 50. SMM 1.87E-03(Ω/sq), MMF, (copper line) (square mesh), (moire),., (FOM) l=1 mm RGB 64 %, Ω/sq (1) 투명사각패치안테나설계및측정결과 5 (l=1, 2 mm) (SMM). SMM 6 (ε r =2.6, tan δ=0.009) 280

5 정방형 메탈메쉬 투명전극을 이용한 투명 사각 패치 안테나 투명 사각 패치 안테나의 치수 표 3. Table 3. Dimension of the transparent rectangular patch antenna. Dimension (mm) (a) l=1 mm 안테나 제작에 사용된 (b) l=2 mm 의 시인성 그림 5. SMM Fig. 5. Optical recognition of SMM for antenna fabrication. Ws Ls Wp Lp Wrl Lrl Lf Wf 성능 비교를 위해 1 mm(l-1, w-0.2)와 2 mm(l-2, w-0.2) 두 가지 간격(l)으로 엮은 평직구조로 하였으며, 또한 안테나 제작 시 두 가지 모두 상 하부 메탈메쉬는 정렬 상태로 하였다. 패치안테나의 크기(L W)는 mm 이며, 급전선의 크기는(L W)는 mm 이다. 또한, 급전 방법은 일반적인 사각 패치 안테나의 급전 과 동일하며, 실제 제작 시 급전용 SMA 커낵터와 메탈메쉬 전극은 그 림 6에서와 같이 접착용 실버페이스트 를 사용하여 도전 되었다. 후면의 그라운드의 크기(L W)는 mm 이다. 자세한 안테나의 치수는 표 3에 정리하였다. 그림 7은 시뮬레이션과 측정된 반사손실, S (db)을 나 타내었고, 표 4에서는 반사손실 6 db 이상의 대역폭을 정 리하였다. 두 가지(l=1, 2 mm) 경우, 모두 2 GHz 대역에 서 6 db 이상의 동작 대역폭을 가지며, 주파수에 따른 반 사손실은 시뮬레이션과 측정 결과에서 비슷하나, 시뮬레 이션 결과가 측정 결과 모두 비해 전반적으로 손실이 높 게 나타났으며, 실제 측정에서의 대역폭이 시뮬레이션에 비해 넓게 나타났다. 이는 실제 제작 시 이상적인 시뮬레 2 2 [3] [3] 2 11 치수 (a) (a) Dimension 사진 (b) (l=2 mm) (b) Picture(l=2 mm) 그림 6. 정방형 메탈메쉬(SMM)를 이용한 투명 사각 패 치 안테나 Fig. 6. Transparent rectangular patch antenna using square metal mesh(smm). 상에 정방형 메탈메쉬(SMM)로 구현되며, 2 GHz 대역에 서 동작하도록 설계하였다. 정방형 메탈메쉬에 사용되는 구리선은 그림 2에서와 같이 0.2 mm 두께의 동선(w)을 그림 7. 투명 안테나의 반사손실(S ) 시뮬레이션 및 측 정 결과 11 Fig. 7. Simulation and measurement results of return losses of transparent antennas. 281

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 4, Apr 표 4. Table 4. Band width of transparent antenna. Line gap (mm) Simulation(GHz) Band width(s 11 > 6 db) Measurement(GHz) (70 MHz) (130 MHz) (110 MHz) (240 MHz),. 8 l=1, 2 mm (x-z plane, y-z plane), [3],[5]. 5, (HPBW), (F/B). l=1 mm 4.8 db, l=2 mm 2.6 db, l=1 mm [3],[5]. (a) l=1 mm 표 5., (HPBW), (F/B) Table 5. Antenna gain, half power beam width(hpbw), front/ back ratio(f/b). Performance (y-z plane) l=1 mm l=2 mm Mea. Sim. Mea. Sim. Gain(dB) HPBW( ) F/B l=2 mm, l=1 mm,, HPBW, (back) (F/B). 6, (copper) (SMM) (MMF) 2 dbi, [7] [9] 2 3 db. (solid),,. 60 % (SMM, MMF) 80 % (MLF) 5 표 6. Table 6. Performance comparison of the transparent patch antennas. (b) l=2 mm( :, : ) (b) l=2 mm(solid line: measurement, dot line: simulation) 그림 8. Fig. 8. Measured radiation patterns of transparent antennas. Transparent antenna Transparent electrode Transmittance (%) Gain (dbi) Patch antenna [3] MLF Patch antenna [3] Copper MMF Patch antenna [8] Copper SMM 63 2 l=2 mm (this research) Copper SMM

7 Ω/sq, 50, 6-4 db.. 결론 (copper wire) (Square Metal Mesh: SMM),. SMM, 64 %.., RGB 6 7 %. SMM 1.87E-03 Ω/sq (MLF, MMF) SMM (FOM) 6.7., SMM, (moire)., 2 GHz, (w=0.2 mm), (mesh) (l=1, 2 mm) (, ). l=1 mm 4.8 db, l=2 mm 2.6 db. l=2 mm, l=1 mm,, HPBW, (back) (F/B). SMM,,,,,. References [1] R. N. Simons, R. Q. Lee, "Feasibility study of optically transparent microstrip patch antenna," in International Symposium and Radio Science Meeting, Montreal, Jul [2] Q. L. Li, S. W. Cheung, D. Wu, and T. I. Yuk, "Optically transparent dualband MIMO antenna using micro- metal mesh conductive film for WLAN system," IEEE Antennas Wireless Propagation Letters, vol. 16, pp , [3] S. Hong, Y. Kim, Y. Jung, and C. Jung, "Transparent microstrip patch antennas with multilayer and metal-mesh films," IEEE Antennas Wireless Propagation Letters, vol. 16, pp , [4] K. H. Choi, H. J. Nam, J. A. Jeong, S. W. Cho, H. K. Kim, and J. W. Kang, et al., "Highly flexible and transparent In Zn Sn O x /Ag/In Zn Sn O x multi-layer electrode for flexible organic light emitting diodes," Applied Physics Letters, vol. 92, no. 22, pp ~3, Aug [5] E. R. Escobar, N. J. Kirch, G. Kontopidis, and B. Turner, "5.5 GHz optically transparent mesh wire microstrip patch antenna," Electronics Letters, vol. 51, no. 16, pp , [6] G. Haccke, "New figure of merit for transparent conductors," Journal of Applied Physics, vol. 47, no. 9, pp , [7],,,,,, " conformal,", 27(5), pp , [8] D. Mathur, S. K. Bhatnagar, and V. Sghula, "Quick estimation of rectangular patch antenna dimensions based on equivalent design concept," IEEE Antennas Wireless Propagation Letters, vol. 13, pp , [9] J. Liu, Q. Xue, "Broadband long rectangular patch antenna with higf gain anf vertical polarization," IEEE Transactions on Antennas Propagation, vol. 61, pp , Feb

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 4, Apr : ( ) : ( ) : NID ( ) : [ 주관심분야 ],, 3D, : ( ) : University of Southern California ( ) : University of California, Irvine, ( ) : LG : University of California, Irvine, Post Doctor : : IT [ 주관심분야 ],,,, EMI/EMC 284

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