Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-11-22
2005-11-22
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S150000, C333S154000, C333S195000, C333S196000, C310S31300R, C310S31300R
Reexamination Certificate
active
06967545
ABSTRACT:
Surface acoustic wave (SAW) zebra-wave-guide (10) implemented as an array of interdigitized electrode fingers, wherein the array has internal inter-finger connectors (18) providing inside electrical shorting of part of fingers (16) remaining other fingers (14) to be isolated, moreover, the array (12) is bordered by important free surface spaces (15). Time delay and phase of the propagating SAW beam front are controlled by the varying of quantity of isolated fingers (14) of the zebra-wave-guide (10). Aggregation (40) of the parallel zebra-wave-guides having different quantities of isolated fingers (14) and different widths allows manipulations with narrow SAW beams' phases and magnitudes, that becomes helpful degree of freedom for desire transformation of the SAW beam (140). Aggregation (890) of bi-directional inter-digital transducer (IDT), U-type 3 dB MSC (85), pair of zebra-wave-guides (10and11) with different quantity of isolated fingers and IDT-wave-guide (847) represents a partially-unidirectional-combined-IDT (890), that may be utilized for a miniaturized low loss SAW filter design (800).
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Langer Edward
Shiboleth Yisraeli Roberts Zisman & Co.
Summons Barbara
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