THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 26(10),

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 26(10), ISSN (Print) ISSN X (Online) Design of a 28 GHz Switched Beamforming Antenna System Based on 4 4 Butler Matrix 박성춘 김승현 손지훈 신현철 Seongchun Park Seunghyeon Kim Jihoon Sohn Hyunchol Shin 요약 5 28 GHz., GHz 4.,. 3, 5 mil RO mm 2, mm , Sidelobe level(sll) 12.9 db. Abstract In this paper, a switched beamforming antenna system at 28 GHz frequency band is described for 5 th generation wireless communication. The butler matrix is used as a beamforming system and it produces linear spaced phase difference at four output ports. Array antenna is designed that can be steered in desired 4 different directions 28 GHz frequency band. Operation of designed butler matrix that composed of couplers and feedline is explained. The antenna system is designed in RO3003 substrate that has a height of 5 mil and dielectric constant of 3. The size of butler matrix is mm 2 and size of array antenna is mm 2. This system can be steered from 34 to 33 and minimum sidelobe level is 12.9 db. Key words: Beamforming, Switched-Beamforming, Millimeter-Wave, Butler Matrix, Array Antenna. 서론, 5 [1]. 28, 38 GHz,, 28 GHz, [2]. RF, RF ( ). (Department of Wireless Communications Engineering, Kwangwoon University) Manuscript received July 10, 2015 ; Revised September 23, 2015 ; Accepted October 2, (ID No S) Corresponding Author: Hyunchol Shin ( hshin@kw.ac.kr) 876 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

2 ADC/DAC [3]. RF., RF, N element N,.,. [4] [7].,, 28 GHz.. 스위치빔포밍안테나시스템설계 4 4, [8]., 배열안테나 28 GHz, 300 MHz Switch N x N Butler Matrix N-array Antenna. Input return loss 10 db. Rogers RO3003, (ε r ) 3, (h) 5 mil.. (2) (3) W, L, h, c, f r, ε r, ε reff. (1) (W). (2) (3), (4) L [9] mm 2. 3 S-parameter GHz GHz 380 MHz, 28 GHz. L (1) (4) RF Signal 50Ω line W 그림 1. N- Fig. 1. Structure of N-switched beamforming system. 그림 2. Fig. 2. Layout of single patch antenna. 877

3 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 10, Oct 그림 3. Fig. 3. Input return loss of single patch antenna (4-element series-fed array), 4 λ/2 1 4 [10],[11] , mm 버틀러매트릭스 4 4 그림 Fig. 4. Layout of 1 4 array antenna. 그림 5. 4 Fig. 5. Input return loss of 4-element series-fed array. Input ports Port 1 Port 2 Port 3 Port 4 3dB 3dB Butler Matrix 45 0dB 45 3dB 3dB 그림 6. Fig. 6. Block diagram of butler matrix. 0dB Output ports Port 5 Port 6 Port 7 Port dB, 4 3-dB (coupler) dB 4, 2 Isolation. 3-dB, dB, S-parameter. 8, 2.95 db, Isolation 24.0 GHz 33.6 GHz 10 db, 878

4 0-dB 3-dB 2 4, 10 3-dB 2 Isolation [12] [14] dB 3-dB 그림 7. 3-dB Fig. 7. Layout of 3-dB coupler. 2, 180 Isolation,.. 11, 0.2 db, Isolation 26.0 GHz 33.0 GHz 10 db, Isolation. 12 그림 8. 3-dB S- Fig. 8. S-parameter of 3-dB coupler. 그림 dB Fig. 10. Layout of 0-dB coupler. 그림 9. 3-dB Fig. 9. Phase difference of 3-dB coupler. Isolation., 그림 dB S- Fig. 11. S-parameter of 0-dB coupler. 879

5 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 10, Oct Port 5 Port 6 Port 7 Port 8 Port 1 Port 2 Port 3 Port 4 그림 12. Fig. 12. Layout of Butler matrix port 1, 4, ±45, port 2, 3, ± mm , 1 4, ohm, GHz 1. 1 Ideal Gap. Gap Ideal Gap 7%. 표 1. Table 1. Phases of output ports. Port 5 Port 6 Port 7 Port 8 Ideal Gap Port Port Port Port 그림 13. Fig. 13. Phases of output ports. 880

6 Array factor [15]. ±42, ±13, ±15, +33, 전체시스템 , mm 2. 2, ADS Momentum EM. 15 Port 1, S- 그림 15. Fig. 15. Beam direction about each inputs. 그림 14. Fig. 14. Layout of total system. 표 2. Table 2. Direction of beam according to input ports. Intput port Port 1 Port 2 Port 3 Port 4 Direction ,. Port 2, db 6.6 db 0.5 db, Port 1, db 6.5 db 1.0 db Port 2, 3 Port 1,

7 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 10, Oct ,.,, [16].... λ/2,,,. [17],[18].. 결과 GHz , Sidelobe level(sll) 12.9 db. References 그림 16. S- Fig. 16. S-parameter of output ports. [1] W. Roh et al., "Millimeter-wave beamforming as an enabling technology for 5G cellular communications", IEEE Communications Magazine, vol. 52, pp , Feb [2] T. Rappaport et al., "Millimeter wave mobile communications for 5G cellular: It will work!", IEEE Access, vol. 1, pp , May [3], "5G ",, pp ,

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9 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 10, Oct : ( ) : [ 주관심분야 ] CMOS Frequency Synthesizer : ( ) : ( ) : ( ) : Daimler-Benz Research Center : : UCLA : Qualcomm : Qualcomm Corporate R&D Visiting Faculty 2003 : [ 주관심분야 ] RF/Analog/Microwave Integrated Circuits and Systems 884