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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6), ISSN (Print) ISSN X (Online) Design of Multiband Repeater Antenna with Fire-Fighting Band for In-Building Mobile Communication 김성민 민경식 Sung-Min Kim Kyeong-Sik Min 요약 , mm., 2-D,. Abstract This paper proposes the design of multiband repeater antenna with fire-fighting band for in-building mobile communication. The proposed antenna is composed of a center monopole and 4 parasitic elements on a circular plate. In order to realize good reflection coefficients at the multiband, mutual coupling between 4 parasitic elements and center monopole antenna is considered. The important parameters such as distance between parasitic element and a center monopole, and each height of a center monopole and 4 parasitic elements are simulated to obtain good antenna characteristics at the multiband. The diameter of 4 parasitic elements and a center monopole was fixed to 10 mm for easy design and manufacturing. The measurement results of reflection coefficients, 2-D patterns and gain agreed well with their simulation ones. Key words: Monopole Antenna, Multiband, Parasitic Element, Fire-Fighting Radio Service, In-Building Mobile Communication.. 서론 MIMO, Wi-Fi, 4G [1],[2].,.. [3],[4] ( ) (No.2013R1A1A205944) 2014 (No.S ). (Department of Radio Communication Engineering, Korea Maritime and Ocean University) Manuscript received April 18, 2016 ; Revised June 1, 2016 ; Accepted June 22, (ID No ) Corresponding Author: Kyeong-Sik Min ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 495

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun ESPAR [5]. ESPAR.,. ESPAR ESPAR., ESPAR,. [6].,. [7] MHz., [8] mmφ, 200 mm., (CP: Center Monopole) 10 mmφ. CP, Wi-Fi MHz( ), MHz(LTE band 5), 1,710 1,880 MHz(DCS), 1,850 1,990 MHz(PCS), 1,920 2,170 MHz(WCDMA1), 2,400 2,470 MHz(Wi-Fi b/g). CP, CP,. 10 db, 0 dbi.. 설계안테나의구조 1. CP, (PPA, PPB, PPC, PPD). PPA Parasitic Pole A (a) 3 (a) 3-D structure (b) (b) Feeding structure (c) (c) Parasitic element and ground plate 그림 1. Fig. 1. Structure of a proposed monopole antenna. 496

3 표 1. Table 1. Design parameters of the proposed antenna. CP PPA PPB PPC PPD (mmφ) (mm) CP (mm) CP ( ) , A, B, C, D. CP FR-4 epoxy. 1 mm, 4.4+j0.04 FR-4 epoxy. 200 mmφ. 10 db, 0 dbi. ANSYS HFSS. 1. CP CP. 1, CP.. 급전 CP 소자설계 2 CP. CP.,. CP 184 mm, 445 MHz 19 db. 3 CP 184 mm CP. CP, 그림 2. CP Fig. 2. Simulated reflection coefficients as a function of variation of a CP height. 그림 3. CP Fig. 3. Simulated reflection coefficients as a function of variation of a CP diameter MHz CP,,. CP 10 mm. CP 10 mmφ. 497

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun 기생소자설계 4 CP PPA. PPA CP 20 mm, PPA. PPA., PPA (445 MHz). 2 3, CP, 4 CP. PPB PPB 1,800 MHz 10 db, PPB CP. 5 PPB, CP PPB. CP PPB. DCS+PCS 1,800 MHz CP PPB 11 mm, CP PPB 12 mm 10 db. 6 CP PPB 11 mm 12 mm. CP PPB 11 mm 그림 5. PPB (1,800 MHz) Fig. 5. Simulated reflection coefficients as a function of variation of a PPB height(1,800 MHz). 그림 6. PPB Fig. 6. Simulated reflection coefficients as a function of variation of a PPB. 그림 4. PPA Fig. 4. Simulated reflection coefficients as a function of variation of a PPA height. LTE. PPB 37.5 mm, CP 12 mm. 10 mm, CP. 10 mm. 7 PPB 5 PPC 498

5 그림 7. PPC (2,100 MHz) Fig. 7. Simulated reflection coefficients as a function of variation of a PPC height(2,100 MHz).. PPC 10 db 4. LTE PPC 40 mm, CP PPC 13 mm. 8 PPD 2,450 MHz. PPD 2,450 MHz /4 25 mm, PPD 12 mm 6 db. CP, , , CP. 11(a) 445 MHz CP, (b) (a) 90 (b) 75 그림 8. PPD (2,450 MHz) Fig. 8. Simulated reflection coefficients as function of variation of a PPD height(2,450 MHz). (c) 60 그림 9. Fig. 9. Varied position of parasitic pole element by angle expression. 499

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun LTE band MHz CP PPA., (c) DCS+PCS 1,800 MHz CP PPB., (d) WCDMA1 2,100 MHz, (e) Wi-Fi 2,450 MHz CP PPD.. 제작및측정 그림 10. Fig. 10. Simulated reflection coefficients for different parasitic element angles. 12. FR-4 epoxy 200 mmφ 10 mm Φ 4 (a) 445 MHz (b) 890 MHz (a) (a) Antenna photograph (c) 1,800 MHz (d) 2,100 MHz (e) 2,450 MHz 그림 11. Fig. 11. Simulated current distribution at each resonance frequency. (b) (SMA ) (b) Back side(feeding by SMA connector) 그림 12. Fig. 12. Photograph of a fabricated antenna. 500

7 (a) 445 MHz (b) 890 MHz 그림 13. Fig. 13. Simulated and measured reflection coefficients of design antenna.. Anritsu Vector Network Analyzer 37369D, 16 m 8 m 6 m.. 13 HFSS VNA., 1,700 MHz., 0.5 mm,. 14, LTE band 5, DCS+PCS, WCDMA1, Wi-Fi 2-D. X-Y, X-Z. 0 dbi. [9]., 890 MHz X PPA, 12(b) PPA CP. 16(b), θ =90 θ= 90 8 dbi (c) 1,800 MHz (e) 2,450 MHz (d) 2,100 MHz 그림 D Fig. 14. Simulated and measured 2-D radiation pattern of design antenna.. PPA CP. 890 MHz 1,800 MHz, 2,100 MHz, 2,450 MHz CP θ=90 θ= 90., 200 mmφ 450 MHz.. 2 θ=90 θ=

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun 표 2. Table 2. Comparison between simulated and measured gain. (dbi, Φ=0 ) (dbi, Φ=0 ) (MHz) ,800 2,100 2,450 θ= θ= θ= θ= MHz 1.1 dbi, 890 MHz 1 dbi, 1,800 MHz 0.5 dbi, 2,100 MHz 5 dbi, 2,450 MHz 2.4 dbi.. 결론.. CP 10 mmφ, CP, 10 db. CP, PPA LTE band 5, PPB DCS+PCS WCDMA1, PPC WCDMA1, PPD Wi-Fi.,,., WCDMA1 Wi-Fi,. References [1],,, " ", TC, 37(2), pp , [2], " ", TE, 41(2), pp , [3] Youngki Lee, Jeageun Ha, and Jaehoon Choi, "Design of a wideband indoor repeater antenna with high isolation for 3G system", Antennas and Wireless Propagation Letters, vol. 9, no. 1, pp , Jul [4] Y. K. Lee, J. P. Kim, J. P. Ja, and J. H. Cho, "Design of a microstrip patch array antenna for WCDMA indoor repeater systems", International Conference on Electromagnetics in Advanced Applications 2009(ICEAA '09), vol. 2, no. 1, pp , Oct [5] Bashir Alshami, Hassan Aboulnour, and Mohamad Dib, "Design of a broadband ESPAR antenna", 2009 Mediterrannean Microwave Symposium, pp. 1-6, [6],,,, " ",, 27(1), pp , [7], " (NFSC 505) ", ( ), pp [8],,,,, " ", ( ), , pp , [9],,, " RF ESPAR ",, 26(8), pp ,

9 : ( ) : ( ) [ 주관심분야 ] MIMO,, NLJD/MMTD : ( ) : ( ) : ( ) : [ 주관심분야 ] FDTD, RFID, MDM(Magneto-Dielectric Material), Pico/Femto Cell MIMO, NLJD/MMTD,, 503

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