Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

H - Electricity

03

H

333/58

H03H 9/25 (2006.01) H03H 9/02 (2006.01) H03H 9/145 (2006.01) H03H 9/64 (2006.01)

Patent

CA 1203294

13 ABSTRACT: In an acoustic surface wave device employing an input and an output transducer 2, 3, and a multistrip coupler 5, the input and output tracks 11, 12, may have to be well separated to avoid unwanted acoustic energy transfer. As a result, a significant loss can occur from the launching of acoustic energy from the interconnecting conductors of the msc. In the improved device, the inter- connecting conductors 22 are given a spacing which is different from that of conductors 16, 17, in either track of the msc, and which must not be such as to launch any acoustic bulk waves within the frequency passband. In a forward transfer msc different spacings can alternate as in Figure 4, and in a reflective msc the spacing can take the mean of the respective spacings of the coupled electrodes.

436734

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