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Unidirectional dispersive transducers and applications to efficient elastic convolver

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5 Author(s)
Yamanouchi, K. ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Gonda, E. ; Morozumi, K. ; Takahashi, S.
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Elastic convolvers an very important for signal-processing devices of the spread spectrum communication systems. We have already fabricated a dispersive IDT with down-chirp directivity on the Y cut-Z propagation LiNbO3 and we fabricated a convolver using this IDT and dispersive split IDT with bi-directionality. An dispersive electrode IDT with an up-chirp directivity has not been obtained. We now propose a dispersive split IDT with an up-chirp directivity using Al/Cr bimetal electrode on Y-Z LiNbO3 substrate. We have successfully fabricated the required IDT using an electro-chemical effect. Furthermore, we also obtained the elastic convolver using this IDT with a high efficiency of -56.5 dBm and low-insertion loss of 11.9 dB at a center describe frequency of 200 MHz

Published in:

Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.

Date of Conference:

5-7 Jun 1996