H - Electricity – 03 – H
Patent
H - Electricity
03
H
349/59.1
H03H 9/145 (2006.01) H03H 9/02 (2006.01) H03H 9/64 (2006.01)
Patent
CA 1261461
- 1 - Abstract: An elastic surface wave device comprises a piezo- electric substrate, a first transducer group, and a second transducer group or groups located on one or both sides of the first group to exchange elastic surface waves with the first group. The second group comprises a plurality of transducers sharing the same elastic surface wave propagation path. The geometrically central positions of the individual transducers making up the second group are located symmetrically about the geometrically central position of the entire second group, with each pair of such symmetrically located transducers incorporating the same number of pairs. The delay time taken by elastic surface waves propagating between the centers of every two adjoin- ing transducers, excluding the two outermost transducers, is constant. The distance between the center of each of the two outermost transducers and that of the transducer adjoining the outermost transducer is so determined that the delay time taken between the two transducers is, if the number of pairs incorporated in the outermost trans- ducer is an integer, equal to an odd-number multiple of one half of the constant delay time, or, if the number of pairs incorporated in the outermost transducer is not an integer, equal to an odd-number multiple of one half of the constant delay time plus or minus a quarter wavelength time. The result is a device the design of which is relatively simple and which enables stop-band response signal rejection and pass-band characteristic improvement for loss reduction, radiation conductance control on the transducers and arbitrary bandwidth setting.
497732
Sasaki Jun
Shiba Takashi
Yamada Jun
Yuhara Akitsuna
Hitachi Ltd.
Kirby Eades Gale Baker
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