National Taiwan University Miniaturized CRLH DualBand Couplers and
National Taiwan University Miniaturized CRLH Dual-Band Couplers and Their Applications in Beam Pattern Diversity Systems P. -L. Chi and T. Itoh, “Miniaturized dual-band directional couplers using composite right/left-handed transmission structures and their applications in beam pattern diversity systems, ” IEEE Trans. Microw. Theory Tech. , vol. 57, no. 5, pp. 1207 -1215, May 2009 Advisor: Prof. Ruey-Beei Wu Speaker: Ting-Yi Huang (黃定彝) 2010/03/04
Outlines n n n 2 Introduction CRLH transmission structures Dual-band CRLH components Application Conclusion National Taiwan University
Introduction: CRLH Tx Lines n Composite right/left-handed (CRLH) tx lines n n 3 Bandpass response Designable phase characteristic C. Caloz and T. Itoh, “Novel microwave devices and structures based on the transmission line approach of meta-materials, ” in IEEE MTT-S Int. Microw. Symp. Dig. , Jun. 2003, pp. 195– 198 National Taiwan University
Introduction: Couplers n Branch-line coupler n 4 90° hybrid D. M. Pozar, Microwave Engineering , 2 nd ed, New York: Wiley, 1998, ch. 7 n Rat-race coupler n 180° hybrid National Taiwan University
Introduction: Beam Forming 5 http: //en. wikipedia. org/wiki/File: Beamforming. jpg National Taiwan University
CRLH Transmission Structures Unit cell: For n cells: 6 National Taiwan University
Dual-Band Branch Line Coupler (1/2) 7 National Taiwan University
Dual-Band Branch Line Coupler (2/2) 8 National Taiwan University
Dual-Band Rat-Race Coupler (1/2) 9 P. -L. Chi, C. -J. Lee, and T. Itoh, “A compact dual-band metamaterial-based rat-race coupler for a MIMO system application, ” in IEEE MTT-S Int. Microw. Symp. Dig. , 2008 National Taiwan University
Dual-Band Rat-Race Coupler (2/2) 10 P. -L. Chi, C. -J. Lee, and T. Itoh, “A compact dual-band metamaterial-based rat-race coupler for a MIMO system application, ” in IEEE MTT-S Int. Microw. Symp. Dig. , 2008 National Taiwan University
Dual-Band Delay Line 11 National Taiwan University
Dual-Band Antenna 12 National Taiwan University
Dual-Band Beam Forming: Type I 13 P. -L. Chi, C. -J. Lee, and T. Itoh, “A compact dual-band metamaterial-based rat-race coupler for a MIMO system application, ” in IEEE MTT-S Int. Microw. Symp. Dig. , 2008 National Taiwan University
Beam Forming Type I: Result 14 P. -L. Chi, C. -J. Lee, and T. Itoh, “A compact dual-band metamaterial-based rat-race coupler for a MIMO system application, ” in IEEE MTT-S Int. Microw. Symp. Dig. , 2008 National Taiwan University
Dual-Band Beam Forming: Type II f 1 15 P. -L. Chi and T. Itoh, “Metamaterial-based components for a compact dual-band beam pattern diversity system, ” in Proc. 38 th Eur. Microw. Conf. , Oct. 2008, pp. 555– 558. f 2 National Taiwan University
Beam Forming Type II: Result 16 P. -L. Chi and T. Itoh, “Metamaterial-based components for a compact dual-band beam pattern diversity system, ” in Proc. 38 th Eur. Microw. Conf. , Oct. 2008, pp. 555– 558. National Taiwan University
Dual-Band Beam Forming: Type III f 1 f 2 17 National Taiwan University
Dual-Band Beam Forming: Type III 18 National Taiwan University
Conclusions n Miniaturized CRLH dual-band components n n n Dual-band beam forming n n 19 90° hybrid, 180° hybrid, and delay line Miniaturization by investigating all possible phase variation Three possible beam forming system Different beam forming behavior at both bands National Taiwan University
National Taiwan University Thanks for your attention. 20
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