THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 27(1), ISSN

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 216 Jan.; 27(1), ISSN (Print)ISSN X (Online) Switch 1.5 GHz Cavity Tunable Filter High Power Cavity Type Tunable Filter Using Switch for 1.5 GHz Band 안세훈 이민호 박종철 정계택 Sehoon AhnMinho LeeJongcheol ParkGyetaek Jeong 요약 1.5 GHz Cavity., Coupler, GHz 4 db, Coupler 4 db Coupling Value 55 db Coupling Isolation. 1,495.91,51.9 MHz Bypass Mode.88 db, 1,495.91,5.9 MHz Fil Mode 3.29 db 1,498.4 MHz 132 W 1 ms. Abstract In this paper, the tunable filter based on high power cavity using mechanical switch for 1.5 GHz band is presented. The LPF is inserted to eliminate the spurious wave, coupler is embeded to extract the output power, and then the tunable filter system is configured using mechanical switch. The LPF obtains attenuation over 4 db between 4 GHz and GHz, Coupler is satisfied with coupling value 4 db and coupling isolation over 55 db. The tunable filter system using mechanical switch obtains insertion loss.88 db at bypass mode between 1,495.9 MHz and 1,51. 9 MHz, 3.29 db at fil mode between 1,495.9 MHz and 1,5.9 MHz. It is also satisfied with output power of 132 W at the center frequency 1,498.4 MHz, and switching time below 1 ms. Key words: Bandpass Filter, Low Pass Filter, Coupler, Tunable Filter, High Power Filter, Mechanical Switch. 서론,., [1].. [2]. 1.5 GHz LTE(Long Term Evolution). 1.5 GHz 4, 1.5 GHz (ATC) (148475). ()(Department of R&D Center, Wave-Tech Corp.) Manuscript received July 9, 215 ; Revised November 9, 215 ; Accepted November 2, 215. (ID No S) Corresponding Author: Gyetaek Jeong ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 1

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 1, Jan [3]. Cavity.,, Cavity,, [4].,, MEMS.,,,,. MEMS,,,,, [5],[6]. SPDT(Sing Pole Double Throw),,,, PIMD [7] RF 2, Q Cavity.. 필터설계 Cavity Block Diagram 1,., Coupler. 1, 1 Genesys Circuit Simulation Tool. 그림 1. Fig. 1. Block diagram. 표 1. cavity Table 1. Target specifications of cavity based on high-power tunable filter. TX Bypass TX Fil 1 1,495.91,51.9 MHz 1,495.91,5.9 MHz db max 5. db max 3.25 db max 2.2 db max 2-1 저역통과필터설계 (LPF : Low Pass Filter), [8]. Cavity (Channel Interference).., SIR(Stepped Impedance). SI 2. References [5] ( ) 2

3 Switch 1.5 GHz Cavity Tunable Filter 그림 2. Fig. 2. Equivalent circuit of low pass filter. 그림 4. Fig. 4. Low pass filter design. 그림 3. SI Fig. 3. Low pass filter of SI structure. ( ) Series L, ( ) Shunt C. 3 - SI.., T- ABCD Z (1), (2). -. tan sin (1) (2) GHz EM Simulation, 5 EM Simulation. EM Simulation Tool CST MWS GHz S 21 4 db Cavity. S parameters [db] Frequency [GHz] 그림 5. S-parameter EM Fig. 5. S-parameter EM simulation of low pass filter. 2-2 Coupler 설계 Coupler, (input) (through), (coupled out) 3 Port. Cavity Coupler EM 6. 3.,.8 mm,.35 mm, loss tangent.9 Teflon Microstrip 4 db coupler, loss tangent Air Type. 7 Coupler EM Simulation. Coupler 3

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 1, Jan LC (3) 그림 6. Coupler Fig. 6. Coupler design. S parameters [db] Frequency [GHz] 그림 7. Coupler S-parameter EM Fig. 7. S-parameter EM simulation of coupler., 4 db Coupling Value 55 db Coupling Isolation. 2-3 대역통과필터설계 RF Cavity.,.,,. [9]. S31 S32 S33..,.., LC. L C, L C, LC, LC. Cavity Open, Short L, C Q, 8 Cavity. RX 7 2 Notch, TX Bypass 그림 8. Cavity Fig. 8. Equivalent circuit of cavity cylindrical resonator. (4) (5) 4

5 Switch 1.5 GHz Cavity Tunable Filter 그림 9. Bypass mode Fig. 9. Bypass mode simulation. S parameters [db] TX -18 RX Col 1 vs Col Frequency [MHz] 그림 1. Fil mode Fig. 1. Fil mode simulation. mode 6 2 Notch 1 Pole Notch, TX Fil mode 4 2 Notch. 91 S-parameter, TX Fil mode,.8 db Circuit Simulation.. 필터의제작및측정결과. 1, ,51.9 MHz 1,495.91,5.9 MHz. 11 Cavity, Body. (a) (a) Filter top (b) (b) Controller 그림 11. Fig. 11. Fabricated frequency tunable filter. 11(a) TX Bypass TX Fil. 11(b) S parameters S parameters S Frequency [MHz] (a) TX Bypass mode (a) TX Bypass mode insertion loss -5 S Frequency [MHz] (b) TX Fil mode (b) TX Fil mode insertion loss 그림 12. Fig. 12. Measured insertion loss. 5

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 1, Jan ms.. 결론 그림 13. cavity Fig. 13. Output power of cavity based on high-power tunable filter., 5 V. 12 Cavity., TX Bypass mode.88 db, TX Fil mode 3.29 db, TX Bypass mode. TX Fil mode. 13, TX Fil mode 1,498.4 MHz 132 W(51.2 dbm) RF. 14 Indcator : 6 ms 그림 14. : 6 ms Fig. 14. Switching speed : 6 ms. Control : 24 V. Bypass mode 15 MHz, Fil mode 5 MHz,, Cavity., Coupler, PIMD. 1,495.91,51.9 MHz Bypass Mode.88 db, 1,495.91,5.9 MHz Fil Mode 3.29 db, 1,498.4 MHz 132 W 1 ms.. References [1] J. N. Eric, L. Juseop, P. Dimitrios, and J. C. William, "Extended passband bandstop filter cascade with continous GHz coverage", IEEE Trans. Microwave Theory Tech., pp , Jan [2] Ji-Seon Ju, Sang-min Han, "Reconfigurable bandpass filter design with a wide frequency tuning range", Journal of Korean Institude of Information Technology, vol. 11, no. 6, pp , Jun [3] (29), "3.9 ", [4], " TE11-mode cavity bandpass filter ", 1998, 21(1), pp

7 를 이용한 1.5 GHz 대역 고출력 Cavity 기반 Tunable Filter Switch 년월 26, [5] J. Uher, W. J. R. Hoefer, "Tunable microwave and millimeter-wave bandpass filters", IEEE Trans. Microwave Theory Tech. vol. 39, no. 4, pp , Apr [6] G. M. Rebeiz, J. B. Muldavin, "RF MEMS switches and switch circuit", IEEE Microwave Magazine, vol. 2, no. 4, pp , Dec. 21. [7] K. Chang, Microwave Solid-State Circuits and Applications, John Wiley & Sons N. Y., [8] K. Chang, I. Bahl, and V. Nair, RF and Microwave Circuit and Component Design for Wireless System, John Wiley & Sons, N. Y., 22. [9] Satya Bhushan Shukla, R. N. Barall, and P. K. Sing-hal, "Design and analysis of microstrip stepped impedance lowpass filter", Antennas, Propagation & EM Theory, 26. ISAPE 6. 7th International Symposium on, pp. 13, Oct. 26. [1],,, "HFSS T-DMB ", ITS, 1(6), pp , 안세 훈 박종 철 년 2월: 순천향대학교 전자공학과 (공 2년 24년: (주) 텔웨이브 기술연구 소 전임연구원 24년 11월 현재: (주) 웨이브텍 기술연 구소 수석연구원 214년 8월 현재: 경남대학교 첨단공학 과 석사과정 [주 관심분야] RF, 초고주파 회로설계, Tunable Filter 2 이민 호 년 2월: 순천향대학교 전자공학과 (공 29년 211년: (주)웨이브일렉트로닉스 기술연구소 책임연구원 211년 1월 현재: (주) 웨이브텍 기술연 구소 수석연구원 23 [주 관심분야] RF, Cavity Filter, EM Simulation, Tunable Filter 고남규 손태호 이용창 를 이용한 용 단일소자 공동 여파기 구현 한국 학회논문지 년 월 년 2월: 순천향대학교 전자공학과 (공 2년 2월: 순천향대학교 전자공학과 (공 학석사) 1996년 23년: (주) 텔웨이브 기술연구 소 선임연구원 23년 9월 현재: (주) 웨이브텍 기술연 구소 연구이사 [주 관심분야] RF, RF 신소재, Tunable Filter 1996 정계 택 년 2월: 인하대학교 전자공학과 (공 25년 2월: 인하대학교 정보통신공학과 (공학석사) 213년 2월: 인하대학교 정보통신공학과 (공학박사) 214년 4월 현재: (주) 웨이브텍 기술연 구소 책임연구원 [주 관심분야] RF 필터, 안테나 설계, 무선통신 등 23 7

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