| 摘要 |
PCT No. PCT/DE89/00553 Sec. 371 Date Mar. 20, 1991 Sec. 102(e) Date Mar. 20, 1991 PCT Filed Aug. 23, 1989 PCT Pub. No. WO90/03690 PCT Pub. Date Apr. 5, 1990.A surface wave filter has two tracks formed by interdigital transducers and coupling transducers on a substrate, wherein center-to-center path distances are defined between the transducers of a track. The relative center-to-center distances between the transducers comply with a particular relationship that depends on wavelength of the surface wave in the substrate. Correction factors are also applied to the relative relationships, which depend on whether the transducers defining each center-to-center distance are of the same type (symmetric or asymmetric) or whether one transducer is on one type and the other is of the other type within a track.
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