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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 214 Nov.; 25(11), ISSN (Print) ISSN X (Online) Planar Frequency-Reconfigurable Monopole Antenna Design 김영규 임종식 한상민 Youngkyu Kim Joingsik Lim* Sang-Min Han 요약., (capacitive loading). EM, GHz 2.42 GHz. Abstract In this paper, a planar frequency reconfigurable antenna is proposed with variable capacitors. The proposed one is designed with a planar monopole, and varies resonant frequencies by variable capacitive loading of a varactor diode. The equivalent circuit and electromagnetic(em) simulation are utilized for the analysis at the variable characteristic design of the antenna, and the same radiation performance. The implemented frequency variable monopole antenna has been verified by comparing prototypes with designed capacitors and ones with biased varactor diodes. The proposed antenna has presented the resonant frequency variations from 2.25 GHz to 2.42 GHz. Key words: Reconfigurable Antennas, Monopole Antennas, Planar Antennas, Varactor Diodes. 서론,. [1],[2]..,,, [3] [6] ( ) ( ). (Department of Information & Communication Engineering, Soonchunhyang University) * (Department of Electrical Engineering, Soonchunhyang University) Manuscript received July 28, 214 ; Revised October 2, 214 ; Accepted October 24, 214. (ID No ) Corresponding Author: Sang-Min Han ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 1121

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 11, Nov. 214.,,., [7].,.,. (meander),., [8] [1]. 1 2, 3, 4.. 주파수가변형모노폴안테나설계. 1. 1,.. 5,. 그림 1. Fig. 1. Layout of the proposed frequency-reconfigurable monopole antenna.,. (loading effect)., (island), (via hole). RF RF choke, (via)., Bias-Tee DC. 5, (W f ) mm, (L f ) mm. (L m ) mm, 2 (G m ) 1.73 mm, (S m ) 3. mm, (W m ).73 mm. 2. 3, 1122

3 그림 2. Fig. 2. Equivalent circuit of the variable antenna., RF choke. LC EM. EM Ansys High Frequency Structure Simulator(HFSS), 4.4, 1 mm FR_4. Agilent Technologies Advanced Design Simulator(ADS).. L 1 =15.5 nh, C 1 =.5 pf, L 2 =26 nh, L_choke=2.2 nh. 3 EM..5 pf 3. pf. 3(a).5 pf, 1. pf, 1.5 pf, 2. pf, 3. pf, 2.42 GHz, 2.33 GHz, 2.3 GHz, 2.29 GHz, 2.27 GHz, 3(b) EM 2.42 GHz, 2.33 GHz, 2.29 GHz, 2.27 GHz, 2.24 GHz.,,. EM pf 1. pf pf 2. pf 3. pf (a) (a) Equivalent circuit simulation.5 pf 1. pf pf 2. pf 3. pf -3 (b) EM (b) EM simulation 그림 3. Fig. 3. Simulated results of the frequency variation for the proposed antenna., GHz 2.42 GHz 4..5 pf, 1. pf, 1.5 pf, 2. pf, 3. pf 1123

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 11, Nov (a) E- (b) H- (a) E-plane pattern (b) H-plane pattern 그림 4. (1 db/div.) Fig. 4. Simulated antenna radiation patterns(1 db/div.). (a) (a) Front side (b) (b) Rear side 그림 5. Fig. 5. Photos of the implemented frequency-variable planar monopole antenna GHz, 2.32 GHz, 2.3 GHz, 2.28 GHz, 2.26 GHz. E- H GHz 6.6 db, 4 db.. 가변주파수안테나제작및측정 1 mm (1t) 4.4 FR4-Epoxy. V 26 V, pf.517 pf Skyworks SMV1283. RF Choke 2.2 nh, mm DC Bias- Tee. (Agilent E571C), DC., DC, DC block. 그림 6. Fig. 6. Measurement setup for reconfigurable antenna with a varactor diode (a) V.5 pf, V 3. pf. 7(b). V 2 V 2.25 GHz 2.42 GHz. 1124

5 pF 25.76V 1.pF 1.V 1.5pF 5.V 2.pF 3.V 3.pF.V -25 (a) (a) Comparison with the equivalent capacitor model V 2 V -25 (b) (b) Resonant frequency variation corresponding to bias voltages 그림 7. Fig. 7. Measured results of the frequency variation of the proposed antenna.. (anechoic chamber) GHz, 2.28 GHz, 2.3 GHz, 2.32 GHz, 2.42 GHz, E- H- 8., (a) E- (a) E-plane pattern (b) H- (b) H-palne pattern 그림 8. (1 db/div.) Fig. 8. Measured antenna radiation patterns(1 db/div.) GHz 4.7 db, 4. db.. 결론., GHz 2.5 GHz. ISM,,., EM. References [1] D. Peroulis, K. Sarabandi, and L. P. B. Katehi, "Design of reconfigurable slot antennas", IEEE Trans. Antennas 1125

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 11, Nov Propag., vol. 53, no. 2, pp , Feb. 25. [2] S. Lee, K. J. Kim, and Y. J. Yoon, "Frequency and pattern reconfigurable antenna with chip inductors and parasitic elements", Proc. Int, Symp. Antennas Propag., 212, pp , Nov [3] S. -L. S., Yang, A. A. Kishk, and K. -F. Lee, "Frequency reconfigurable U-slot microstrip patch antenna", IEEE Antennas Wireless Propag. Lett., vol. 7, pp , Jul. 28. [4] J. -S. Row, T. -Y. Lin, "Frequency-reconfigurable coplanar patch antenna with conical radiation", IEEE Antennas Wireless Propag. Lett., vol. 9, pp , Nov. 21. [5] H. L. Zhu, X. H. Liu, S. W. Cheung, and T. I. Yuk, "Frequency-reconfigurable antenna using metasurface", IE- EE Trans. Antennas Propag., vol. 62, no. 1, pp , Jan [6],, " ",, 11(6), pp , [7],,, " ",, 61(1), pp , [8] R. Sato, "A design method for meander-line networks using equivalent circuit transformations", IEEE Trans. Microw. Theory Tech., vol. 19, pp , May [9] R. Hosono, N. Guan, H. Tayama, and H. Furuya "An equivalent circuit model for meander-line monopole antenna attached to metallic plate", Proc. Int. Symp. Antennas Propag, 212, pp , Nov [1] A. Das, S. Dhar, and B. Gupta, "Lumped circuit model analysis of meander line antennas", Med. Microw. Symp., pp , Sep : ( ) : [ 주관심분야 ] RF Systems : ( ) : ( ) 23 2 : ( ) : : BK : : 25 3 : [ 주관심분야 ] /, /, 1126

7 : ( ) : ( ) 23 8 : ( ) : University of California, Los Angeles(UCLA), Post-Doc. Research Fellow : : Georgia Institute of Technology, Research Faculty 27 9 : [ 주관심분야 ] RF Systems, Low-Power Transceivers, Active Integrated Antennas 1127

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