Unidirectional transducer and saw filter comprising the same
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United States of America Patent
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-
May 6, 2003
Grant Date -
Nov 14, 2002
app pub date -
Nov 29, 2000
filing date -
Oct 31, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A unidirectional transducer for a SAW filter having a first group (D) including electrode finger (21) and electrode fingers (14) and (16) arranged at center distances of 3.lambda./8 and 5.lambda./8 in a direction opposite to the propagation direction of the surface acoustic wave from electrode finger (21); a second group (E) including electrode fingers (22), (15) and (20) arranged at center distances of 10.lambda./8, 13.lambda./8 and 15.lambda./8 in the propagation direction from electrode finger (21); and a third group (F) including electrode fingers (17), (18) and (19) arranged at center distances of 3.lambda./8, 5.lambda./8 and 7.lambda./8 in the propagation direction from electrode finger (21).
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