H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/58
H03H 9/64 (2006.01) H03H 9/02 (2006.01) H03H 9/72 (2006.01) H03H 9/145 (2006.01)
Patent
CA 1144611
Abstract A three-transducer SAW filter is disclosed that in- cludes a central input transducer requiring only one-half of the interdigital fingers normally required by prior art three-transducer SAW filters. As a result, two input trans- ducers may now be provided in the space normally occupied by one prior art input transducer. The only requirement is that each input transducer have an axis of symmetry about which surface waves are propogated symmetrically. Since each input transducer may have a different frequency re- sponge, a dual-passband SAW filter may now be provided in the space normally occupied by a single prior art SAW fil- ter. Furthermore, a multi-passband SAW filter may be pro- vided by arranging pairs of input transducers between three or more output transducers which are electrically coupled in parallel. In addition, the input and output connections of a multi-passband SAW filter may be interchanged such that an input signal, applied to the parallel connected output transducers is frequency sorted by the passbands of each of the input transducers.
360828
Gowling Lafleur Henderson Llp
Motorola Inc.
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