Method for making a strain-relieved tunable dielectric thin film
First Claim
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1. A method of making a tunable dielectric thin film, the method comprising the steps of:
- depositing a buffer layer on a low dielectric loss substrate; and
depositing a layer of crystalline dielectric film on the buffer layer, wherein the buffer layer and the crystalline dielectric film comprise barium strontium titanate and wherein the barium strontium titanate eventually comprises a randomly oriented crystalline cubic phase in each of the buffer layer and the crystalline dielectric film.
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Abstract
Tunable dielectric thin films are provided which possess low dielectric losses at microwave frequencies relative to conventional dielectric thin films. The thin films include a low dielectric loss substrate, a buffer layer, and a crystalline dielectric film. Barium strontium titanate may be used as the buffer layer and the crystalline dielectric film. The buffer layer provides strain relief during annealing operations.
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Citations
43 Claims
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1. A method of making a tunable dielectric thin film, the method comprising the steps of:
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depositing a buffer layer on a low dielectric loss substrate; and
depositing a layer of crystalline dielectric film on the buffer layer, wherein the buffer layer and the crystalline dielectric film comprise barium strontium titanate and wherein the barium strontium titanate eventually comprises a randomly oriented crystalline cubic phase in each of the buffer layer and the crystalline dielectric film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of making a tunable dielectric thin film, the method comprising the steps of:
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depositing a buffer layer on a low dielectric loss substrate;
annealing the buffer layer after it was deposited on the low dielectric loss substrate;
depositing a layer of crystalline dielectric film on the buffer layer; and
annealing the crystalline dielectric film after it was deposited on the dielectric buffer layer, wherein the buffer layer and the crystalline dielectric film comprise barium strontium titanate and wherein the barium strontium titanate comprises a randomly oriented crystalline cubic phase in each of the annealed buffer layer and the annealed crystalline dielectric film. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of making a tunable dielectric thin film, the method comprising the steps of:
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depositing a buffer layer on a low dielectric loss substrate;
annealing the buffer layer after it was deposited on the low dielectric loss substrate;
depositing a layer of crystalline dielectric film on the buffer layer; and
annealing the crystalline dielectric film after it was deposited on the dielectric buffer layer, wherein the annealed buffer layer and the annealed crystalline dielectric film each have a randomly oriented crystalline cubic phase. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification