Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1998-11-10
2000-10-31
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333194, 310313D, H03H 964
Patent
active
061408905
ABSTRACT:
A SAW filter, comprising a piezoelectric substrate and a first interdigital electrode having a period of L and disposed on the piezoelectric substrate. The filter converts an input voltage into a surface acoustic wave on the piezoelectric substrate. A second interdigital electrode having the period of L is disposed on the piezoelectric substrate in parallel with the first interdigital electrode with respect to a propagating direction of the surface acoustic wave. The second interdigital electrode converts the surface acoustic wave on the piezoelectric substrate into a voltage. A pair of first reflectors having a period of L/2 are disposed on the piezoelectric substrate and beside both sides of a pair of the first and second interdigital electrodes in the propagating direction keeping a distance of nL/2+0.5 L therefrom, where n is an integer equal to or larger than zero. At least a second reflector having the period of L/2 is disposed on the piezoelectric substrate and beside an outer side of one of the first reflectors in the propagating direction keeping a distance mL/2+0.75 L therefrom, where m is an integer equal to or larger than zero.
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Japanese Office Action issued Feb. 24, 2000 in a related application with English translation of relevant portions.
NEC Corporation
Pascal Robert
Summons Barbara
LandOfFree
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