Surface acoustic wave device with KNb03 piezoelectric thin film, frequency filter, oscillator, electronic circuit, and electronic apparatus
First Claim
1. A surface wave device comprising:
- one of a (110) silicon substrate and a (100) silicon substrate;
a first oxide thin film layer on said substrate formed from one of strontium oxide and magnesium oxide;
a second oxide thin film layer on said first oxide thin film layer;
a potassium niobate piezoelectric thin film on said second oxide thin film layer; and
a protective thin film on said potassium niobate piezoelectric thin film, said protective thin film consisting of one of oxide and nitride.
1 Assignment
0 Petitions
Accused Products
Abstract
Surface acoustic wave device having a high k2, and a frequency filter, oscillator, electronic circuit and electronic device employing this surface acoustic wave device is provided, wherein a first oxide thin film layer comprising SrO or MgO and a second oxide thin film layer comprising SrTiO3 are sequentially formed on top of a (110) Si substrate, or a first oxide thin film layer comprising CeO2, ZrO2 or yttrium-stabilized zirconia and a second oxide thin film layer comprising SrTiO3 are sequentially formed on top of a (100) Si substrate, a KNbO3 piezoelectric thin film being then formed on top of either of these second oxide thin film layers, and then, a protective film comprising oxide or nitride is formed on top of the KNbO3 piezoelectric thin film, finally, at least one electrode is formed on top of this protective film, to form a surface acoustic wave device, which surface acoustic wave device is employed to form a frequency filter, oscillator, electronic circuit, or electronic device.
-
Citations
17 Claims
-
1. A surface wave device comprising:
-
one of a (110) silicon substrate and a (100) silicon substrate;
a first oxide thin film layer on said substrate formed from one of strontium oxide and magnesium oxide;
a second oxide thin film layer on said first oxide thin film layer;
a potassium niobate piezoelectric thin film on said second oxide thin film layer; and
a protective thin film on said potassium niobate piezoelectric thin film, said protective thin film consisting of one of oxide and nitride. - View Dependent Claims (2, 3, 4)
-
- 5. A surface acoustic wave device having a (100) silicon substrate and a potassium niobate piezoelectric thin film, characterized in the provision of said silicon substrate, a first oxide thin film layer formed on top of said silicon substrate, a second oxide thin film layer formed on top of said first oxide thin film layer, said potassium niobate piezoelectric thin film formed on top of said second oxide thin film layer, and a protective thin film comprising oxide or nitride formed on top of said potassium niobate piezoelectric thin film.
- 9. A surface acoustic wave device having a (110) silicon substrate and a potassium niobate piezoelectric thin film, characterized in the provision of said silicon substrate, a first oxide thin film layer formed from one of strontium oxide and magnesium oxide formed on top of said silicon substrate, a second oxide thin film layer formed on top of said first oxide thin film layer, said potassium niobate piezoelectric thin film formed on top of said second oxide thin film layer, and a protective thin film comprising oxide or nitride formed on top of said potassium niobate piezoelectric thin film.
Specification