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Precise and full extraction of the coupling-of-mode parameters with periodic Green’s function

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【Author】 LIN Jiming 1,2, WU Haodong 1, WANG Ning 1, QIU Hongbing 2 & SHUI Yongan 1 1. State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China; 2. Department of Communication and Information Engineering, Guilin Institute of Electronic Technology, Guilin 541004, China Correspondence should be addressed to Lin Jiming

【机构】 State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China； Department of Communication and Information Engineering, Guilin Institute of Electronic Technology, Guilin 541004, China Correspondence should be addressed to Lin Jiming ,State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China,State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China,Department of Communication and Information Engineering, Guilin Institute of Electronic Technology, Guilin 541004, China Correspondence should be addressed to Lin Jiming ,State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China；

【Abstract】 Precise extraction of coupling-of-mode (COM) parameters plays a key role in the design for modern high performance surface acoustic wave (SAW) filters. An accurate and efficient analysis of char- acteristics for SAW propagating under periodic metal gratings has been developed based on the concept of harmonic admittance and periodic Green抯 function. Some further improvement is made on the nu- merical algorithm, such as isolation of the logarithmic singularity, asymptotic simplification of periodic Green抯 function, and utilization of Chebyshev polynomials as basis functions of the charge distribution. The most important point is extraction of the phase of coupling reflection coefficient by the characteris- tics of standing wave on the edges of stopband. This approach leads to a fast, precise and full extraction of COM parameters. The results and discussions for several materials have been presented.更多还原

【关键词】 surface acoustic wave (SAW)； Green抯 function； harmonic admittance； coupling-of-mode model (COM).；
【Key words】 surface acoustic wave (SAW)； Green抯 function； harmonic admittance； coupling-of-mode model (COM).；

【文献出处】 Science in China(Series F:Information Sciences) ,中国科学(F辑:信息科学)(英文版) , 编辑部邮箱 ,2003年04期

【分类号】TN65
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