【摘 要】
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Background, Motivation and Objective The design of high performance SAW filters requires accurate prediction of second order effects such as diffraction, electroacoustic coupling, electrical parasitic
【机 构】
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Phonon Corp, Simsbury, CT, USA Laboratoire LEM3,
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Background, Motivation and Objective The design of high performance SAW filters requires accurate prediction of second order effects such as diffraction, electroacoustic coupling, electrical parasitics, and bulk mode signals. Filters comprised of bidirectional transducers having 3 or 4 strips per wavelength can be designed to achieve passband ripples of < 0.1dB-pp and <0.5deg-pp (with triple transit removed), and close-in rejection better than 60dBc. The drawback of these structures is the triple transit time spurious which degrades the passband ripples, increasing with lower insertion loss. The triple transit can be reduced by 15dB or more by adding mechanical reflectors in the transducers at the expense of reduced accuracy of the analysis.
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