SPUDTSingle-Phase Uni-Directional Transducer
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The SPUDT filter has acoustic reflectors deposited within the transducer, which are positioned in such a manner that acoustic waves add constructively and destructively in the forward and reverse directions, respectively.
In this structure, a reflector is inserted between the input and out put SPUDT transducers.
When compared to the SPUDT filter performance shown previously, the multitrack design approach enables SAW designers to achieve the required filter shaping with approximately half the die size.