Abstract: An acoustic surface wave device having an acoustic energy absorber of acoustic surface wave absorbing material positioned between the input transducer and the output transducer. The acoustic energy absorber increases the insertion loss of the device and consequently suppresses triple transit signals in the device.

Abstract: An acoustic surface wave device having a pair of attenuating transducers positioned between the input transducer and the output transducer. Each attenuating transducer has two sets of interleaved electrodes which are connected together by a thin film resistor. The attenuating transducers are spaced apart so that their reflected signals are 180.degree. out of phase, and thus tend to cancel each other. The attenuating transducer arrangement increases the insertion loss of the device and consequently suppresses triple transit signals in the device.

Abstract: An acoustic surface wave filter device having an input transducer of interleaved overlapping electrode structure. Acoustic surface wave absorbing material is disposed on a region of the electrodes within the overlap envelope and back of the electrodes having the maximum amount of overlap. The absorbing material suppresses waves traveling backward in the transducer thus greatly reducing the problem of spurious signals caused by acoustic reflections from the edges of the electrodes within the overlap envelope.

Abstract: An acoustic surface wave device including a three-phase unidirectional transducer. The transducer has three sets of interdigitated electrodes. The first and second sets of electrodes are each connected to bus bars, one on each side of the central axis of the transducer. The electrodes of the third set are connected to two bus bars one on each side of the central axis. The structure of the third set of electrodes and the bus bars connected thereto is symmetrical with respect to the central axis. The balanced structure of the transducer permits simplified impedance-matching and phase-shifting networks for enabling three-phase unidirectional operation of the transducer from a single phase electrical source.

Abstract: An acoustic surface wave filter device having an input transducer of interleaved overlapping electrode structure. The portions of the inactive electrodes and the active electrodes outside the overlap envelope are combined into continuous uninterrupted metal layers. The elimination of electrode edges in the regions of the metal layers greatly reduces the problem of spurious signals caused by acoustic reflections from the edges.