| 摘要 |
PCT No. PCT/FR91/00024 Sec. 371 Date Jul. 13, 1992 Sec. 102(e) Date Jul. 13, 1992 PCT Filed Jan. 15, 1991 PCT Pub. No. WO91/11856 PCT Pub. Date Aug. 8, 1991.Ultrahigh-frequency surface acoustic wave filter has a two-channel structure with, preferably, a symmetric pair of input transducers (2, 6) and an associated pair of weighted output transducers (8, 9), and an associated pair of reflectors (14, 15). These reflectors (14, 15) are offset by a distance (d) equal to a quarter of the acoustic-wave wavelength ( lambda ), within an integral number of half wavelengths. The weightings of the output transducers are chosen in order to provide the desired impulse response.
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