Abstract
An analysis of delay lines using interdigital surface wave transducers is presented based on an equivalent circuit model. Transmission characteristics in the time domain are obtained in terms of the time-shift operators of Laplace trans- form calculus. Two types of transducer configurations are dis- cussed for digital delay line applications. It becomes evident that the transducer configurations utilizing a phase-code, such as the Barker-code or the Golay-code, are useful for digital de- vices. The analytical values of the delay time and output re- sponse agree well with the experimental results. I. INTRODUCTION Elastic surface waves promise unlimited application for analog and digital signal processing because surface waves con- vert easily to and from electromagnetic energy. Interest in sur- face waves derives from their slow propagation velocities, ap- proximately 1 Os times smaller than the propagation velocity of electromagnetic waves. Making full use of the aforemen- tioned characteristics of surface waves, it is possible to obtain excellent quality digital lines. Two modes of delay line operation are possible, depending on the form of the transmitted signals. One is a modulated pulse operation and the other is a dc pulse operation. The former is necessary for broad-band transducers to transmit signal waveforms faithfully. The latter is necessary for the transmission of dc pulses, rather than the transmission of the
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