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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Aug.; 27(8), ISSN (Print) ISSN X (Online) Development of a Duplexer Module for Remote Wireless Communication System of Guided Weapon System with Temperature-Insensitive Electrical Performances 최병창 Byung-Chang Choi 요약.,,,.,,. 3D EM.,,. Abstract In this paper, A duplexer module with temperature-insensitive electrical characteristics was proposed for remote wireless communication system. Duplexer modules are required to have performances of low insertion loss, high isolation between transmitted band and received band, harmonic suppression as well as high power durability in the system for transmitting guided information to missile flying a free space on the ground. The proposed duplexer module are consist of transmission bandpass filter and receiving bandpass filter which are connected to common antenna port, planar coupler for output power monitoring and low pass filter for harmonic attenuation of power amplifier and coaxial cavity resonator. The material and dimensions of the resonator are determined for minimum frequency shift by temperature variation using 3D EM simulation. The measured results of the prototype showed a good agreement with the simulation results, and it should be well applied not only for guided weapon systems but also for any other communication systems such as remote radio head. Key words: Duplexer Module, Coaxial Cavity Resonator, Temperature-Insensitive, Power Durability 1 (The 1st R&D Institute Researcher, Agency for Defense Development) Manuscript received June 6, 2016 ; Revised July 27, 2016 ; Accepted August 10, (ID No ) Corresponding Author: Byung-Chang Choi ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 709

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug 서론, RF Microwave., [1] SPDT ns., PIN,.. /.,,,. 그림 1. RF Fig. 1. Block diagram of RF front-end for FDD comm. 표 1. Table 1. Electrical characteristics of the duplexer module. Contents Tx-band Rx-band Frequency GHz GHz Insertion 1.1 db 0.9 db Insertion 2.5 db 1.0 db Return loss 20 db 20 db Group delay variation 180 ns 30 ns Attenuation 1 10 GHz Attenuation 2 75 Attenuation GHz Harmonic rejection Tx-Rx band isolation Coupling Directivity 40 db 90 db 40.0 db 20.0 db 50 GHz 10 GHz 10 GHz [2] [4]... 듀플렉서모듈설계 2-1 동축공동공진기필터 (Tx) (Rx).,. 1 Agilent ADS 2. [5],[6].,,, 9 2 Nested 710

3 표 2. Table 2. Coupling coefficients of the duplexer filters. 그림 2. (ADS ) Fig. 2. Equivalent circuit of the duplexer(ads schematic). 그림 3. Fig. 3. Simulation circuit for coupling coefficient., 6 CQ(Cascaded Quadruplet). 2 ADS,. 3, (1) 2,. f 1 f 2. 3,. Tx-filter Value Rx-fiter Value T nh R nh T ,080.6 nh R nh T ,846.1 nh R nh T nh R nh T ,001.6 nh R nh T ,843.7 nh R pf T ,003.3 nh R pf T nh R A nh T ,568.7 nh R i nh T ,077.2 nh T ,136.9 nh T ,001.5 nh T A nh T o nh (1) 그림 4. Fig. 4. Internal structure of the duplexer. 50 Ω ( ), 30 MHz,., 4,,. 2 (T A, T o, R A, R i )

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug ,. ( : 3,000 kv/m) [7]. [7] Ansys HFSS 7, (4.5 mm). 그림 7. Fig. 7. Shape and peak power simulation of Tx-resonator. 그림 5. Ant. Fig. 5. Group delay frequency characteristic of Ant. port. 그림 8. Fig. 8. Coupling structure of the coaxial cavity resonator. 그림 6. Tx Rx Fig. 6. Group delay frequency characteristic of Tx&Rx port.., 8. 8,. [2]. 712

5 ,.., (2). L 1, L 0, cte, T 1, T 0. (2) (Invar), HFSS,. 2-2 저역통과필터 Ω high low,. High 그림 10. Fig. 10. Frequency response of the single low pass filter. 1.0 Φ, low 7.6 Φ, 0.3 mm air-type(ε r=1) 8.0 Φ. HFSS, db, 25 db/dec. 2-3 모니터링용커플러, 11. 그림 9. 7 Fig. 9. The designed 7th-order strip type low pass filter. 그림 11. PCB Fig. 11. The designed PCB type forward coupler. 713

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug 표 3. Table 3. Design parameter of the coaxial cavity resonator. Design variables Tx resonator [mm] Rx resonator [mm] Material INVAR SUM24L Res_h Res_d Boss_h Boss_d Cavity_d Cavity_h 그림 12. Fig. 12. Characteristics of the coupler with Tx filter.. 1/100(40 db).. FR4, 12.,.. 듀플렉서모듈개발및성능평가 2T/2R ,, 13. (3 μm),. (bar). 13, (a) (a) Interior of the duplexer (b) (b) Exterior of the duplexer 그림 13. 2T/2R Fig. 13. Mechanical modeling of the 2T/2R duplexer. 50 Ω,., ±50 khz, SUM24L ±200 khz , 16., 2 13 GHz EM,. mm mm mm (,, ) 2.0 kg. 714

7 그림 14. Fig. 14. Frequency response of the Tx-band BPF. 그림 17. Fig. 17. Harmonic frequency responses. 표 4. Table 4. Electrical characteristics of the duplexer module. 그림 15. Fig. 15. Frequency response of the Rx-band BPF. Contents Tx-band Rx-band Frequency GHz GHz Frequency shift ±50 khz ±200 khz Resonator Q-value 3,500 2,900 Insertion 0.9 db 0.7 db Insertion 2.1 db 0.8 db Ripple 1.2 db 0.1 db Group delay variation 110 ns 9.5 ns Return loss 27.3 db 27.8 db Attenuation 1 Attenuation 2 Attenuation GHz 56.5 GHz GHz 13.3 GHz 13.8 GHz Harmonic rejection 53.0 db 54.0 db Rx to Tx isolation Tx to Rx isolation Coupling Directivity (Isolation-coupling) 95.0 db db 40.0 db 20.0 db. 결론 그림 16. ( ) Fig. 16. Total transmission characteristic of the duplexer., 715

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug , PCB 7.,,.,. References [1],,,,,, " (RLI) ",, pp , [2] Xuguang Wang, Geonho Jang, Boram Lee, and Namshin Park, "Compact quad-mode bandpass filter using modified coaxial cavity resonator with improved Q-factor", IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 3, pp , Mar [3] M. Burgos-Garcia, "Design of temperature-insensitive filters using coupled coaxial cavities", Electronics Letters, vol. 42, no. 4, Feb [4] Mohammad Memarian, Raafat R. Mansour, "Quad-mode and dual-mode dielectric resonator filters", IEEE Transactions on Microwave Theory and Techniques, vol. 57, no. 12, pp , Dec [5] J. Brian Thomas, "Cross-coupling in coaxial cavity filter- a tutorial overview", IEEE Transactions on Microwave Theory and Techniques, vol. 51, no. 4, pp , Apr [6] Richard J. Cameron, Chandra M. Kudsia, and Raafat R. Mansour, Microwave Filters for Communication System, Wiley. [7] Felice M. Vanin, Fabrizio De Paolis, and Dietmar Schmitt, "Resonator voltage prediction in microwave bandpass filters", IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 2, pp , Feb : ( ) : ( ) : ( ) : [ 주관심분야 ] RF Front-End System, Launcher System 716

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