Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1998-09-15
2000-06-13
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333195, 310313B, H03H 9145, H03H 964
Patent
active
060754265
ABSTRACT:
A surface acoustic wave device includes a piezoelectric substrate and plural IDTs for sending and receiving SAW mounted on the substrate. At least one of the IDTs includes a positive electrode including plural positive split electrodes (PSEs) and a negative electrode including plural negative split electrodes (NSEs). The PSEs and NSEs are arranged alternately. Each of the PSEs andNSEs has apair of electrode fingers. Two electrode fingers of each of the split electrodes are different in width in a direction in which a SAW is excited. An angle .alpha. determined by a direction transverse to the electrode fingers from one of the two electrode fingers having a smaller reflection factor toward the other one having a larger reflection factor and a direction in which the SAW excited by the IDT including the split electrodes travels to one of the IDTs for receiving the SAW is equal to or larger than 0.degree. and smaller than 90.degree., i.e., 0.ltoreq..alpha.<90.
REFERENCES:
patent: 4162465 (1979-07-01), Hunsinger et al.
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 5274345 (1993-12-01), Gau
patent: 5818146 (1998-10-01), Kurahashi et al.
patent: 5831492 (1998-11-01), Solie
Ikata Osamu
Matsuda Takashi
Satoh Yoshio
Tsutsumi Jun
Fujitsu Limited
Pascal Robert
Summons Barbara
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