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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Aug.; 23(8), ISSN (Print) LTCC Bluetooth/WiFi A Bluetooth/WiFi Dual-Mode RF Front-End Module Using LTCC Technology 함범철 유종인 김준철 김동수 박영철 Beomcheol Ham Jong In Ryu* Jun Chul Kim* Dongsu Kim* Youngcheol Park 요약 (Low Temperature Co-fired Ceramic: LTCC) WiFi (RF Front-end Module),. 2.4/5 GHz 2 GHz, 5 GHz, SPDT SP3T. LTCC,. (inner ground) 3 13, 3.0 mm 3.7 mm 0.66 mm. Abstract This paper presents a compact bluetooth/wifi dual-mode dual-band RF front-end module(fem) is realized by low temperature co-fired ceramic(ltcc) technology. The proposed RF front-end module consists of a diplexer, baluns in the LTCC substrate, and an SPDT switch, an SP3T switch on the LTCC substrate. In order to reduce the module size and increase integration level, the proposed diplexer and balun are designed using LC lumped elements. The parasitic elements caused by coupling effect between metal pattern layers and ground plane layer are considered during the design. The fabricated dual-mode RF front-end module has 13 pattern layers including three inner ground layers and it occupies less than 3.0 mm 3.7 mm 0.66 mm. Key words : LTCC, Diplexer, Balun, Front-end Module. 서론., GPS,, WiFi,,,. LTCC, LTCC SiP(System in Package), (Department of Electronic Engineering, Hankook University of Foreign Studies) * (Packaging Research Center, Korea Electronics Technology Institute) Manuscript received April 18, 2012 ; Revised June 26, 2012 ; Accepted July 20, (ID No ) Corresponding Author : Youngcheol Park ( 958 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

2 LTCC Bluetooth/WiFi (a) (a) Schematic 그림 1. Fig. 1. Block diagram of the proposed dual-mode RF FEM. [1],[2]. LTCC Wi-Fi. LTCC,, 2.4/5 GHz 2.4/5 GHz,, /5 GHz 2.4/5 GHz, SPDT SP3T 기생성분을이용한수동소자설계및최적화 [3]. (b) (b) Simulation result 그림 /5 GHz Fig /5 GHz band diplexer without parasitic components..,.. 2., 5 GHz BPF filter S-parameter. layout.,,. 959

3 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 23, no. 8, Aug (a) (a) Schematic., WiFi 2.4 GHz, L s1 3.2 nh 2.76 nh, C s1 C s3. WiFi 5 GHz, C s4 1.6 pf 1.7 pf, L p nh 0.86 nh, L s nh 1.87 nh., C p2 C p3, C p4.,,... 다이플렉서설계및구현 (b) (b) Simulation result 그림 /5 GHz band Fig /5 GHz band diplexer with parasitic components GHz, 5 GHz. Shunt,. 4, /5 GHz,, 2.4 GHz BPF,, 4. (open matching) (conjugate matching). LTCC. 그림 /5 GHz band Fig. 4. Schematic of 2.4/5 GHz band diplexer. 960

4 LTCC Bluetooth/WiFi 50,. 2.4/5 GHz. 2.4/5 GHz (1). (1) (1) G, B. 2.4/5 GHz 0. (2). (2) (1), (2) 3D 5. 7, 2.4/5 GHz 2.27 db, 1.73 db, 12.7 db, db, 6. 그림 6. Fig. 6. Simulated and measured performance of diplexer.. 발룬설계및구현,, (a) 2.4 GHz (a) 2.4 GHz balun (b) 5 GHz (b) 5 GHz balun 그림 5. 3D Fig. 5. Three-dimensional view of the diplexer. 그림 7. Fig. 7. Schematic. 961

5 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 23, no. 8, Aug 그림 /5 GHz 3D Fig. 8. Three-dimensional view of the 2.4/5 GHz balun. (a) (a) Amplitude imbalance characteristic (a) (a) Amplitude imbalance characteristic 그림 GHz Fig GHz balun. (b) (b) Phase difference characteristic 그림 GHz Fig GHz balun. (b) (b) Phase difference characteristic [4].,. 2.4 GHz 5 GHz [2]. 2.4/5 GHz GHz 5 GHz, 2.4/5 GHz 5, 3D /5 GHz, 4.06 db, 4.0 db, 962

6 LTCC Bluetooth/WiFi 13.0 db, 15.4 db., imbalance 2.4/5 GHz 0.32 db, 0.45 db, , 무선전단부모듈의설계및구현 2.4/5 GHz 2.4/5 GHz db SPDT, SP3T (NJG- 16 ). DC Blocking LTCC., 2.4/5 GHz. 3D 11, 12.,.,., 5 GHz (a) LTCC (b) (a LTCC substrate (b) Top view 그림 12. Fig. 12. Fabricated RF FEM..,,, via,,, GHz WiFi 2.4/5 GHz WiFi 1.3 db, 0.5 db, , ,, 0.2 db. 2. 그림 11. 3D Fig. 11. Three-dimensional view of the proposed RF FEM. 표 1. Table 1. Performance of the dual-mode RF front-end module. 2.4 GHz/ 5 GHz (db) (db) 2.4 GHz 5 GHz 2.4 GHz 5 GHz GHz BT (1) 13 (2) 13 (3) 963

7 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 23, no. 8, Aug 표 2. 2G/5G Table 2. Comparison of dual-mode RF front-end module. (a) 2.4/5 GHz (a) Insertion and return losses of 2.4/5 GHz band Tx path (mm) Max. 2.4 GHz (db) FEM [5] FEM [6] SW+AMP +Balun Diplexer+SW +AMP FEM [7] SW+AMP Diplexer+SW +Balun 1 : Rx bypass mode 2 :., 3 db 4.32 db,.. 결론 (b) 2.4/5 GHz (b) Insertion and return losses of 2.4/5 GHz band Rx path (c) (c) Bluetooth path 그림 13. Fig. 13. Measured result of RF FEM. WiFi, LTCC,. 2.4/5 GHz 2.4/5 GHz,,,. 3.0 mm 3.7 mm 0.66 mm., LTCC. 참고문헌 [1] D. H. Kim, D. Kim, J. C. Kim, J. C. Park, and C. 964

8 LTCC Bluetooth/WiFi D. Park, "A novel integrated dual-mode RF frontend module for Wi-Fi and bluetooth applications", 2011 EEE MTT-S Int. Microwave Symp. Dig., pp. 1-4, Jun [2] D. Kim, D. H. Kim, J. I. Ryu, C. D. Park, C. S. Kim, I. S. Song, and J. C. Kim, "A compact Wi- MAX diplexer module with LTCC and FBAR technologies", Proc. 39 th Eur. Microw. Conf., vol. 1, pp , Sep [3] Andriy Yatsenko, Denys Orlenko, Sergiy Sakhnenko, Georgiy Sevskiy, and Patric Heide, "A smallsize high-rejection LTCC diplexer for WLAN applications based on a new dual-band bandpass filter", IEEE/MTT-S Int. Microwave Symp. Dig., pp , Jun [4] D. Staiculescu, N. Bushyager, A. Obatoyinbo, L. J. Martin, and M. M. Tentzeris, "Design and optimization of 3-D compact stripline and microstrip bluetooth/wlan balun architectures using the design of experiments technique", IEEE Trans., vol. 53, pp , May [5] [6] [7] : ( ) : : [ 주관심분야 ] RF, System on Package, LTCC, RF FEM, RF Power Amplifier 1991 : ( ) 1993 : ( ) 1998 : ( ) : 2010 : [ 주관심분야 ] RF,, System on Package 1988 : ( ) 2000 : ( ) : : 2006 : [ 주관심분야 ] RF /, RF system, System on Package, Embedded Components 1997 : ( ) 1999 : ( ) 2001 : Georgia Institute of Tech. ECE ( ) 2004 : Georgia Institute of Tech. ECE ( ) : 2011 : [ 주관심분야 ] RF /, Ferroelectric Tunable Device, 965

9 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 23, no. 8, Aug : ( ) : ( ) : Georgia Institute of Tech. ECE ( ) : 2007 : [ 주관심분야 ] RF,, 966

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