THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct , EBG. [4],[5],. double split ring resonator (D

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Oct.; 29(10), ISSN (Print) ISSN X (Online) DSRR Isolation Improvement in Vivaldi Antennas Using DSRR 윤주호 박대성 장동혁 황금철 Juho Yun Daesung Park* Donghyeok Jang* Keum Cheol Hwang 요약, double split ring resonator(dsrr). Unitcell DSRR, DSRR 1 2. DSRR unitcell 5 mm 5 mm 1.52 mm, 6 unitcell. DSRR DSRR 1 2, DSRR DSRR 20 db. Abstract In this paper, a double split-ring resonator(dsrr) is proposed to improve the isolation between Vivaldi antenna elements. The DSRR was designed using a unit cell simulation and applied to a 1 2 Vivaldi antenna array to confirm the improvement in the isolation. The unit cell size of the proposed DSRR is 5 mm 5 mm 1.52 mm and six unit cells are used. To verify the performance of the proposed DSRR, 1 2 Vivaldi antenna arrays with and without the DSRR were fabricated and measured. The results show an isolation improvement of 20 db in the Vivaldi antennas with the DSRR when compared to the Vivaldi antennas without the DSRR. Key words: Absorber, Double Split Ring Resonator(DSRR), Isolation Improvement, Metamaterial, Vivaldi Antenna. 서론, [1].,,..., grating lobe. [2] electromagnetic band gap(ebg) [3] ( ). (Department of Electrical and Computer Engineering, Sungkyunkwan University) * (Hanwha Systems) Manuscript received July 25, 2018 ; Revised September 19, 2018 ; Accepted October 2, (ID No ) Corresponding Author: Keum Cheol Hwang ( khwang@skku.edu) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 739

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct , EBG. [4],[5],. double split ring resonator (DSRR). tool ANSYS HFSS.. DSRR Unitcell 설계 1 DSRR unitcell mm Taconic RF-30, 2. DSRR, split ring resonator(srr) 2. DSRR s 1 =5 mm, s 2 =2.57 mm, s 3 =1.77 mm, s g =0.2 mm, s w =0.2 mm. Unitcell x-z, x-y, y-z perfect electric conductor(pec), perfect magnetic conductor (PMC). 2 unitcell, 3 DSRR. [6] GHz,. 그림 2. DSRR unitcell Fig. 2. S-parameter results of DSRR unitcell. 그림 3. DSRR unitcell Fig. 3. Effective permittivity and permeability of DSRR unitcell. DSRR, DSRR y- [7]. DSRR.. DSRR 이적용된안테나설계 그림 1. DSRR unitcell Fig. 1. Unitcell structure of DSRR. 4(a) DSRR mm Taconic RF-30, 3., 50 Ω strip line 740

(1) Tapered +x-, (3) A 0 exponential b. A 0 = 0.12, b=0.33 tapered. 5 1 2 DSRR, 2 6 DSRR unitcell. DSRR 1 4, 5 mm. 1 DSRR. 6 DSRR. DSRR DSRR,. S 11 DSRR 9.

3 DSRR (a) (a) Perspective view (b) (b) Parameters of Vivaldi antenna 그림 4. Fig. 4. Vivaldi antenna structure.. Strip line strip line-to-slot line transition.. 4(b). l 1 =24.73 mm, l 2 =15 mm, x 1 =2.56 mm, x 2 =2.38 mm, g=0.24 mm, f 1 =12.74 mm, f 2 =4.9 mm, f 3 =2.82 mm, a=76.6 deg. tapered. (1) Tapered +x-, (3) A 0 exponential b. A 0 = 0.12, b=0.33 tapered DSRR, 2 6 DSRR unitcell. DSRR 1 4, 5 mm. 1 DSRR. 6 DSRR. DSRR DSRR,. S 11 DSRR 9.5 GHz 10 db. S 21 DSRR 9.5 GHz 20 db S 21, DSRR DSRR 20 db 40 db S 21. DSRR, GHz DSRR. DSRR. 그림 5. DSRR 1 2 Fig Vivaldi antenna structure with DSRR. 741

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct. 2018. 유무에 따른 산란계수 모의실험 결과 그림 6. DSRR Fig. 6. Simulation results of S-parameters with/without DSRR.

Fig. 8. Simulated and measured results of S-parameters. 이 있는 모델과 DSRR이 없는 모델 모두 제작하였으며, 기판 가장자리에 있는 4개의 post를 통하여 두 개의 기판 을 적층하였다. 그림 8은 모의실험 및 측정된 산란계수 결과이다.

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct 유무에 따른 산란계수 모의실험 결과 그림 6. DSRR Fig. 6. Simulation results of S-parameters with/without DSRR. 반사계수 (a) (S11) (a) Reflection coefficient(s11) Ⅳ. 제작 및 측정 결과 그림 7은 제작한 1 2 비발디 안테나의 형상이다. DSRR 투과계수 (b) (S21) (b) Transmission coefficient(s21) 이 없는 모델 (a) DSRR (a) Without DSRR 모의실험 및 측정된 산란계수 그림 8. Fig. 8. Simulated and measured results of S-parameters. 이 있는 모델과 DSRR이 없는 모델 모두 제작하였으며, 기판 가장자리에 있는 4개의 post를 통하여 두 개의 기판 을 적층하였다. 그림 8은 모의실험 및 측정된 산란계수 결과이다. Agilent 8510C 네트워크 분석기를 사용하여 측 정하였으며, 측정된 S 값은 두 모델 모두 9.5 GHz 대역 에서 10 db 이하의 값을 갖는다. S 결과에서 보면 측 정된 DSRR의 공진점이 모의실험 결과 대비 고주파에서 공진을 갖는데, 이것은 제작상의 오차로 보인다. 그림 9 는 모의실험 및 측정된 방사패턴의 그래프이다. 제작된 안테나의 방사패턴 측정은 포트 1에서 신호를 인가하고, 포트 2는 50 Ω의 부하로 종단시켜 이루어졌다. 방사패턴 의 측정은 9.8 GHz에서 이루어졌다. DSRR의 유무와 관 이 있는 모델 제작한 (b) DSRR (b) With DSRR 비발디 안테나 그림 Fig. 7. Fabricated 1 2 Vivaldi antenna. 742

5 DSRR, 1 2 DSRR. DSRR 1 2 S GHz 10 db, S 21 DSRR 20 db. DSRR, +x-. DSRR. References (a) E-plane (b) H-plane 그림 9. Fig. 9. Simulated and measured normalized radiation patterns. +x-, E-plane +y-. DSRR 4.8 dbi, 5.4 dbi.. 결론 DSRR. DSRR unitcell [1] R. J. Mailloux, Phased Array Antenna Handbook, Boston, Artech House, 2005, pp [2] B. A. Arand, A. Bazrkar, and A. Zahedi, "Design of a phased array in triangular grid with an efficient matching network and reduced mutual coupling for wide-angle scanning," IEEE Transactions on Antennas and Propagation, vol. 65, no. 6, pp , [3] Q. R. Zheng, Y. Q. Fu, and N. C. Yuan, "A novel compact spiral Electromagnetic Band-Gap(EBG) structure," IEEE Transactions on Antennas and Propagation, vol. 56, no. 6, pp , Jun [4] M. M. Bait-Suwailam, O. F. Siddiqui, and O. M. Ramahi, "Mutual coupling reduction between microstrip patch antennas using slotted complementary split-ring resonators," IEEE Antennas Wireless Propagation Letters, vol. 9, pp , [5] C. C. Hsu, K. H. Lin, and H. L. Su, "Implementation of broadband isolator using metamaterial-inspired resonators and a T-shaped branch for MIMO antennas," IEEE Transactions on Antennas and Propagation, vol. 59, no. 10, pp , Oct [6] Z. Szabo, G. H. Park, R. Hedge, and E. P. Li, "A unique extraction of metamaterial parameters based on Kramers- Kronig relationship," IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 10, pp , Oct

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6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct [7] C. Caloz, T. Itoh, Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications: The Engineering Approach, Hoboken, John Wiley & Sons, [ / ] : ( ) : [ 주관심분야 ], [ ( )/ ] : ( ) : ( ) : ( ) [ 주관심분야 ],, [ ( )/ ] : ( ) : ( ) : ( ) : ( ) : ( ) : ( ) : [ 주관심분야 ],, [ / ] : ( ) : ( ) : ( ) : : [ 주관심분야 ],, 744

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THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Oct.; 29(10), 799 804. http://dx.doi.org/10.5515/kjkiees.2018.29.10.799 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Method