US4965479A — Surface transverse wave resonator

Claim 1

Independent Claim 179 words

A method for operating a surface elastic wave device to provide a surface skimming bulk wave device in the form of a surface transverse wave resonator, comprising; providing a piezoelectric substrate having at least one surface, wherein said substrate includes a crystalline structure that permits the propagation of transverse waves; providing at least one set of transducing periodic perturbations which are in contact with said substrate surface, said at least one set of transducing periodic perturbations having first and second edges substantially perpendicular to the direction of propagation of said transverse waves, wherein said one set of transducing perturbations transduces electromagnetic energy from an external source into acoustic waves including said transverse waves; and confining said transverse waves adjacent to said substrate surface and reflecting said transverse waves by providing at least two sets of surface-trapping and reflecting periodic perturbations substantially perpendicular to the direction of propagation of said transverse waves, at least one of said sets of reflecting periodic perturbations being disposed opposite each of said respective edges of said at least one set of transducing periodic perturbations.

Claim 2

Independent Claim 179 words

A method for operating a surface elastic wave device to provide a surface skimming bulk wave device in the form of a surface transverse wave resonator, comprising; providing a piezoelectric substrate having at least one surface, wherein said substrate includes a crystalline structure that permits the propagation of transverse waves; providing at least one set of transducing periodic perturbations which are in contact with said substrate surface, said at least one set of transducing periodic perturbations having first and second edges substantially perpendicular to the direction of propagation of said transverse waves, wherein said one set of transducing perturbations transduces electromagnetic energy from an external source into acoustic waves including said transverse waves; and confining said transverse waves adjacent to said substrate surface and reflecting said transverse waves by providing at least two sets of surface-trapping and reflecting periodic perturbations substantially perpendicular to the direction of propagation of said transverse waves, at least one of said sets of reflecting periodic perturbations being disposed opposite each of said respective edges of said at least one set of transducing periodic perturbations.

Claim 3

Dependent Claim 41 words

The method of operating the surface transverse wave resonator as claimed in claim 1, wherein said surface-trapping and reflecting periodic perturbations confine said transverse waves to within one to three wavelengths of said transverse waves immediately adjacent to said substrate surface.

Claim 4

Dependent Claim 37 words

The surface transverse wave resonator as claimed in claim 2, wherein adjacent ones of said periodic perturbations have a center-to-center distance, and further wherein said center-to-center distance is in the range of approximately one to 20 microns.

Claim 5

Dependent Claim 26 words

The surface transverse wave resonator as claimed in claim 3, wherein each of said perturbations is an elongated bar member in contact with said substrate surface.

Claim 6

Dependent Claim 37 words

The surface transverse wave resonator as claimed in claim 4, wherein each of said elongated bar members has a certain height, and further wherein said certain height is in the range of approximately 300 to 3000 Angstroms.

Claim 7

Dependent Claim 27 words

The method of operating the surface transverse wave resonator as claimed in claim 3, wherein each of said surface-trapping and reflecting periodic perturbations is an elongated groove.

Claim 8

Independent Claim 250 words

A method for operating a surface elastic wave device to provide a surface skimming bulk wave (SSBW) device in the form of a surface transverse wave resonator, comprising: providing a piezoelectric substrate having at least one surface, wherein said substrate includes a crystalline structure that permits the propagation of transverse waves; providing a transducing set of periodic perturbations which are in contact with said substrate surface, said transducing set of periodic perturbations having first and second edges substantially perpendicular to the direction of propagation of said transverse waves, wherein said transducing set converts electromagnetic energy from an external source into acoustic waves including said transverse waves; providing a receiving set of periodic perturbations which are in contact with said substrate surface remote of said transducing set of periodic perturbations, said receiving set of periodic perturbations having first and second edges substantially perpendicular to the direction of propagation of said transverse waves, wherein said receiving set converts said transverse waves into resultant electromagnetic energy; providing a central set of surface-trapping periodic perturbations for confining said transverse waves adjacent to said substrate surface, wherein said central set is positioned intermediate said transducing set and said receiving set; and providing at least two sets of reflecting periodic perturbations substantially perpendicular to the direction of propagation of said transverse waves for reflecting said transverse waves, wherein each of said sets of reflecting periodic perturbations is positioned adjacent to a respective one of said transducing set and said receiving set remote of said central set.

Claim 9

Independent Claim 250 words

A method for operating a surface elastic wave device to provide a surface skimming bulk wave (SSBW) device in the form of a surface transverse wave resonator, comprising: providing a piezoelectric substrate having at least one surface, wherein said substrate includes a crystalline structure that permits the propagation of transverse waves; providing a transducing set of periodic perturbations which are in contact with said substrate surface, said transducing set of periodic perturbations having first and second edges substantially perpendicular to the direction of propagation of said transverse waves, wherein said transducing set converts electromagnetic energy from an external source into acoustic waves including said transverse waves; providing a receiving set of periodic perturbations which are in contact with said substrate surface remote of said transducing set of periodic perturbations, said receiving set of periodic perturbations having first and second edges substantially perpendicular to the direction of propagation of said transverse waves, wherein said receiving set converts said transverse waves into resultant electromagnetic energy; providing a central set of surface-trapping periodic perturbations for confining said transverse waves adjacent to said substrate surface, wherein said central set is positioned intermediate said transducing set and said receiving set; and providing at least two sets of reflecting periodic perturbations substantially perpendicular to the direction of propagation of said transverse waves for reflecting said transverse waves, wherein each of said sets of reflecting periodic perturbations is positioned adjacent to a respective one of said transducing set and said receiving set remote of said central set.

Claim 10

Dependent Claim 42 words

The method of operating the surface transverse wave resonator as claimed in claim 7, wherein said central set of surface-trapping periodic perturbations confines said transverse waves to within one to three wavelengths of said transverse waves immediately adjacent to said substrate surface.

Claim 11

Dependent Claim 37 words

The surface transverse wave resonator as claimed in claim 8, wherein adjacent ones of said periodic perturbations have a center-to-center distance, and further wherein said center-to-center distance is in the range of approximately one to 20 microns.

Claim 12

Dependent Claim 49 words

The surface transverse wave resonator as claimed in claim 9, wherein said center-to-center distance of said periodic perturbations of said transducing set, said receiving set and said reflecting sets is approximately 4.0 microns, and said center-to-center distance of said periodic perturbations of said central set is approximately 3.86 microns.

Claim 13

Dependent Claim 27 words

The surface transverse wave resonator as claimed in claim 10, wherein each of said periodic perturbations is an elongated bar member in contact with said substrate surface.

Claim 14

Dependent Claim 37 words

The surface transverse wave resonator as claimed in claim 11, wherein each of said elongated bar members has a certain height and further wherein said certain height is in the range of approximately 300 to 3000 Angstroms.

Claim 15

Dependent Claim 20 words

The surface transverse wave resonator as claimed in claim 12, wherein said substrate is a 38.4 degree rotated Y-cut quartz.

Claim 16

Dependent Claim 29 words

The surface transverse wave resonator as claimed in claim 13, wherein said transducing set, said receiving set and said reflecting sets perform the surface trapping of said transverse waves.

Claim 17

Dependent Claim 25 words

The surface transverse wave resonator as claimed in claim 14, wherein said resonator operates in the frequency range of approximately 100 MHz to 5 GHz.

Claim 18

Dependent Claim 25 words

The surface transverse wave resonator as claimed in claim 15, wherein said elongated bar members are deposited onto said substrate surface by semiconductor fabrication techniques.

Claim 19

Dependent Claim 24 words

The surface transverse wave resonator as claimed in claim 10, wherein each of said periodic perturbations of said reflecting sets is an elongated groove.

Claim 20

Dependent Claim 18 words

The surface transverse wave resonator as claimed in claim 17, wherein said substrate is 38.4 degree Y-cut quartz.

Claim 21

Dependent Claim 29 words

The surface transverse wave resonator as claimed in claim 18, wherein said transducing set, said receiving set and said reflecting sets perform the surface trapping of said transverse waves.

Claim 22

Dependent Claim 25 words

The surface transverse wave resonator as claimed in claim 19, wherein said resonator operates in the frequency range of approximately 100 MHz to 5 GHz.

Claim 23

Dependent Claim 24 words

The method of operating the surface transverse wave resonator as claimed in claim 20, wherein said elongated grooves are fabricated by semiconductor fabrication techniques.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-10-22	1994-04-23	1994-10-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-10-22	1998-04-23	1998-10-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-10-22	2002-04-23	2002-10-23	$7700.00	Window Closed / Lapsed

Surface transverse wave resonator

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