Method of making a monolithic thin film resonator lattice filter
First Claim
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1. A method of fabricating a monolithic thin film resonator, lattice filter comprising the steps of:
- providing a supporting substrate with a planar surface;
positioning a first conductive film on the planar surface of the supporting substrate, the first conductive film being separated into a first pair of spaced apart conductive strips defining a first set of I/O terminals;
positioning a layer of piezoelectric material on the first conductive film;
positioning a second conductive film on the layer of piezoelectric material, the second conductive film being separated into a second pair of spaced apart conductive strips positioned orthogonal to the first pair of conductive strips with each of the second pair of conductive strips overlying a portion of each of the first pair of conductive strips at cross-over areas and defining a second set of I/O terminals, each of the cross-over areas defining a thin film resonator with a resonant frequency and the thin film resonators being arranged in a two by two array; and
positioning one each of two portions of a dielectric film of material on two of the cross-over areas to mass load two thin film resonators defined by the two cross-over areas and alter the resonant frequency of the two thin film resonators which are mass loaded, the two thin film resonators being positioned along a diagonal of the two by two array.
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Abstract
A monolithic thin film resonator, lattice filter including spaced apart strips of a conductive film positioned on a substrate so as to define a first set of I/O terminals, a layer of piezoelectric material positioned on the conductive film, and spaced apart conductive strips of a conductive film positioned on the piezoelectric layer orthogonal to the first strips to form cross-over areas, each defining a thin film resonator and a second set of I/O terminals. A plurality of portions of a dielectric film are positioned on selected cross-over areas to mass load the thin film resonators so as to lower the resonant frequency.
233 Citations
8 Claims
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1. A method of fabricating a monolithic thin film resonator, lattice filter comprising the steps of:
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providing a supporting substrate with a planar surface; positioning a first conductive film on the planar surface of the supporting substrate, the first conductive film being separated into a first pair of spaced apart conductive strips defining a first set of I/O terminals; positioning a layer of piezoelectric material on the first conductive film; positioning a second conductive film on the layer of piezoelectric material, the second conductive film being separated into a second pair of spaced apart conductive strips positioned orthogonal to the first pair of conductive strips with each of the second pair of conductive strips overlying a portion of each of the first pair of conductive strips at cross-over areas and defining a second set of I/O terminals, each of the cross-over areas defining a thin film resonator with a resonant frequency and the thin film resonators being arranged in a two by two array; and positioning one each of two portions of a dielectric film of material on two of the cross-over areas to mass load two thin film resonators defined by the two cross-over areas and alter the resonant frequency of the two thin film resonators which are mass loaded, the two thin film resonators being positioned along a diagonal of the two by two array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification