Use of acoustic transducers as generalised electrical circuit elements

An approach to surface-acoustic-wave (SAW) devices in which individual transducers are used as generalized electrical components is presented. The description of a prototype interdigital transducer (IDT) illustrates the application of SAW technology to the lowpass filter design demonstrating a sharp 40 dB notch near 130 MHz. An immediate application could be found for the rejection of CW interference in various civil and military systems. This approach extends the use of SAW technology to lowpass and highpass filter structures and provides a low insertion loss capability without incurring the penalty of the deleterious triple-transit signal in conventional 2-port SAW devices.