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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 28(3), ISSN (Print) ISSN X (Online) PCB Broadband Dual Polarization Dipole Antenna with Feeding Structure of PCB Coupling 박철근 민경식 Chul-Keun Park Kyeong-Sik Min 요약 700 MHz. PCB.. ( 31.6 %) ( 19.4 %) 12.2 %. S-,,. Abstract This paper proposed a method of broadband method of dual polarized dipole antenna for 700 MHz band base station. The proposed antenna has a structure that PCB feeder is mounted on the metallic radiator. The design of radiator and feeder is optimized by using 3D EM simulation. The proposed antenna(bandwidth 31.6 %) is broadened over 12.2 % through the lower frequency band than reference antenna(bandwidth 19.4 %), however the size is not increased. Measured results of S-parameters, radiation patterns, and gain have a good agreement with simulation ones. Key words: Broadband, Base Station, Dual Polarized Dipole Antenna, Coupling PCB Feeder. 서론 LTE(Long Term Evolution), PS-LTE(Public Safety LTE) [1]., /. 700 MHz, LTE [2]. 700 MHz., 700 MHz [B , LTE ]. (Department of Radio Science & Engineering, Korea Maritime and Ocean University) Manuscript received September 20, 2016 ; Revised December 9, 2016 ; Accepted December 21, (ID No ) Corresponding Author: Kyeong-Sik Min ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 163

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar [3] [5]. 700 MHz. ( ) PCB.. 기존연구의분석 그림 2. S- Fig. 2. S-parameters of conventional antenna. (a) 3 (a) 3D structure (b) (b) Front and side structure 그림 1. ( ) Fig. 1. Structure of conventional antenna(reference antenna). 1(a) (b) [6].,, λ/4., ,. 2 S MHz 14 db, 25 db. 960 MHz 9.5 dbi, HPBW 67 ±3., 1 λ., X-, Y-, Y- + X- 45 [7].. 제안하는이중편파다이폴안테나

3 PCB, PCB., PCB Rogers RO3730, 1.6 mm d 1, d 2, b 1,,, 176 mm, 132 mm, 76 mm. 176 mm,. λ/4, MHz, 960 MHz 698 MHz. a c, a, b, c. 4(a) (c). 4(a) b 4 mm, c 30 mm, a 12 mm 20 mm 2 mm. a, 16 mm. 4(b) a 16 mm, c 30 mm b. b 2 mm 6 mm 1 mm, 4 mm. b 4 mm. 4(c) PCB. a 16 mm, b 4 mm. c (a) 3 (a) 3D structure (b) ( ) ( ) (b) Radiator(left) and feeder(right) 표 1. Table 1. Parameters of proposed antenna. Parameter a b c b 1 d 1 d 2 Value Variable Variable Variable 76 mm( f high) 176 mm 132 mm (c) (c) Front and side structure 그림 3. Fig. 3. Structure of proposed antenna., PCB. 165

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar (a) a (a) Variation of parameter a 그림 5. S- Fig. 5. Optimized S-parameters of proposed antenna. 표 2. Table 2. Optimized values of antenna parameters. Parameter a b c Value 16 mm 4 mm 30 mm (b) b (b) Variation of parameter b (c) c (c) Variation of parameter c 그림 4. Fig. 4. Analysis results of antenna parameters MHz S MHz 14 db, 26 db % 31.6 %. 26 db λ/4, λ/4.. 제안안테나의제작및측정 6 S-, 7. S MHz 14 db 166

5 PCB 결합 급전구조를 가지는 광대역 이중편파 다이폴 안테나 Port #2 (-45 Pol.) 제안한 안테나의 측정된 파라미터 그림 6. SFig. 6. Measured S-parameters of proposed antenna. Port #1 (+45 Pol.) 제안한 안테나의 구조 및 좌표계 그림 8. Fig. 8. Structure and coordination of proposed antenna. (a) 698 MHz 제작된 안테나 사진 그림 7. Fig. 7. Photograph of fabricated antenna. 를 만족하며, 포트 간 분리도는 26 db로 시뮬레이션 결 과와 잘 일치하는 것을 알 수 있다. 분리도 특성을 보면 레벨 변화가 조금 불안정하게 보이는데, 이는 다이폴 안 테나 구조의 변환부분에 의한 것이다. 패턴의 편파 이해를 돕기 위해 그림 8에 안테나의 형상 과 좌표를 나타내었다. 수직편파는 XZ-plane이며, +45 편 파는 그림에 보인 바와 같이 좌측 상단에서 우측 하단으 로 형성되고, 45 편파는 우측 상단에서 좌측 하단으로 형성된다. 그림 9는 제작된 안테나를 698 MHz와 960 MHz에서 측정한 방사패턴을 나타낸다. 수직 패턴은 배열 합성되는 (b) 960 MHz 제안한 안테나의 방사패턴 그림 9. Fig. 9. Radiation patterns of proposed antenna. 성분이기 때문에 단일 안테나의 성능 평가에서 비중이 크지 않지만, 수평 편파의 경우 단일 안테나의 성능이 배 열 안테나의 성능에 그대로 반영되기 때문에 패턴 분석 이 매우 중요하다. +45 수평편파와 45 수평편파를 분 리하여 나타냈으며, 각 주파수별 수직, 수평 패턴을 하나 의 그래프로 나타내었다. 가는 선은 시뮬레이션 결과이 167

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar PCB. 14 db, 26 db, 10.2 dbi.. References 그림 10. Fig. 10. Gain of proposed antenna.,.,,. ± db MHz 10.5 dbi, 960 MHz 10.2 dbi,.. 결론 ( 19.4 %) 12.2 %,. [1], ", LTE ", [2],, " 3GPP ",, 29(6), pp , [3] ZTE cooperation, "LTE APT 700 MHz Device White Paper", Jun [4] Hiroyuki Seki, Morihiko Minowa, "Technological trends in mobile access system", Fujitsu Sci. Tech. J., vol. 49, no. 3, pp , Jul [5], "700 MHz ",, 25(10), pp , [6],,, " ",, , [7],,, " ",, ,

7 PCB : ( ) : ( ) : ( ) : ( ) : ( ) : ( ) [ 주관심분야 ] MIMO,, : ( ) : ( ) : ( ) : [ 주관심분야 ] FDTD, RFID, MDM (Magneto-Dielectric Material), Pico/Femto Cell MIMO, NLJD/MMTD,, 169

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