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- W2163214995 abstract "Abs~uct-Scattering arguments reveal some unappreciated problems that arise when conventional unidirectional transducers are incorporated in grating-resonator fiiters to improve off-resonance rejection. Excessive insertion loss or substantial transducer reflections appear to be unavoidable. A nonreciprocal form of transducer junction is described that can be used to model ideal behavior. To improve off-resonance rejection in surface acoustic wave (SAW) resonator filters, Fildes and Hunsinger [ 1 ] have proposed using unidirectional transducers [ 21 - [ 61 (UDTs) in the manner illustrated in Fig. l(a). With their active acoustic ports facing away from each other, the transducers can communicate only via reflections from the resonator gratings. Filter transmission is thus considerably attenuated outside the grating stopband where the gratings become largely transparent. By comparison a 2-port single-resonator filter with conventional bidirectional transducers (BDTs) in place of the UDTs behaves as a mismatched delay line when the gratings go transparent. duces others that have not been fully appreciated. On the basis of rather general scattering arguments it is shown here that conventional reciprocal UDTs present a choice between excessive losses in the transducer junctions and undesirably strong acoustic reflections that complicate (and may frustrate) filter design. The difficulties can be overcome in principle by using a nonreciprocal form of UDTs described below. Since the new UDTs require circulators, however, it is presently unclear whether they can be implemented in a satisfactory form. It is thus possible that UDTs will be inherently less attractive than first supposed for grating-resonator applications. The present comments are based on Kurokawa’s [ 71 powerwave scattering formalism, which defines the wavescattering coefficients Sij of a junction in terms of arbitrary terminations. As a result lSii12 is the ratio of actual power transferred through port i to available power entering port j alone, and no power is internally reflected from the junction’s own terminations. The most general junction required for the present discussion is a 4-port, with a 4 X 4 scattering matrix Si,. As usual Sii is the complex amplitude reflection coefficient at port i, and Sij with j # i is the complex amplitude transmission coefficient between ports j and i. (Scattering indices are read from right to left.) For present purposes the well-known unitarity conditions [ 81 on the scattering matrix of a lossless junction are written in a modified form that takes account of losses: While this application of UDTs solves one problem it intro" @default.
- W2163214995 created "2016-06-24" @default.
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- W2163214995 date "1979-09-01" @default.
- W2163214995 modified "2023-09-24" @default.
- W2163214995 title "Behavior of Unidirectional Transducers in Grating Resonators" @default.
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- W2163214995 doi "https://doi.org/10.1109/t-su.1979.31119" @default.
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