Low Loss 0.9-1.9 GHz SAW Filters with Submicron Finger Period Electrodes

Urabe, Shinji; Asakawa, Koji; Itoh, M.; Gokan, H.; Esho, Sotaro; Nishikawa, K.; Nishihara, Tokihiro

doi:10.1109/ultsym.1980.197422

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1982

1986

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Cited by 6 publications

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A Closed-Form Expression for Apodization Loss

Macchiarella¹

1986

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Absfrucf-It is well known that an apodized SAW transducer (both bidirectional and unidirectional) generates a nonuniform acoustic wavefront; this fact produces an increment of the overall attenuation between the electric ports of transmitting and receiving transducers (the latter assumed with uniform overlap), on the order of 1 dB, depending on the apodization curve. An expression for the apodization loss as a function of the normalized sequence of the overlap of an apodized transducer is computed through a circuit model of the SAW device. It is also demonstrated that the proposed expression can be obtained from the theoretical analysis of Waldron on nonuniformly irradiated transducers.

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