Synthesis of acoustic-surface-wave-resonator filters using any of various coupling mechanisms

Design of surface-wave resonator bandpass filters from lumped-element low-pass prototypes is treated by use of a generalized version of Cohn's direct-coupled filter theory. Equations are presented for straightforwud application of the method to the design of SAW resonator filters with acoustic-...

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Bibliographic Details
Published inIEEE transactions on sonics and ultrasonics Vol. 25; no. 2; pp. 72 - 84
Main Authors Matthaei, G.L., Savage, E.B., Barman, F.
Format Journal Article
LanguageEnglish
Published IEEE 01.03.1978
Subjects
Band pass filters
Chebyshev approximation
Equations
Filtering theory
Prototypes
Reflection
Resonator filters
Surface acoustic waves
Surface treatment
Voltage
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Summary:Design of surface-wave resonator bandpass filters from lumped-element low-pass prototypes is treated by use of a generalized version of Cohn's direct-coupled filter theory. Equations are presented for straightforwud application of the method to the design of SAW resonator filters with acoustic-array couplings, transducer couplings, or multistrip couplings. To illustrate this technique, a four-resonator filter with a given Chebyshev response is set as an objective, and several designs were worked out for such a filter, each using different coupling arrangements. The responses for the various designs were computed, and though an met the given passband specifications, some are seen to have stronger stopband attenuation than others. Conclusions are drawn with regard to the range of application of the various types of couplings. The derivation of the equations needed for the design of acoustic-array and multistrip couplings is outlined in appendices.
ISSN:0018-9537
2162-1403
DOI:10.1109/T-SU.1978.30991