K
Keigo Nagao
Researcher at Ube Industries
Publications - 35
Citations - 687
Keigo Nagao is an academic researcher from Ube Industries. The author has contributed to research in topics: Layer (electronics) & Polyimide. The author has an hindex of 10, co-authored 35 publications receiving 675 citations.
Papers
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PatentDOI
Thin film acoustic resonator and method of producing the same
TL;DR: In this article, a pit is formed in a substrate comprising a silicon wafer (51) on a surface of which a silicon oxide thin layer (53) is formed, and a sandwich structure comprising a piezoelectric layer (62) and lower and upper electrodes (61, 63) are disposed so as to stride over the pit.
Patent
Thin film bulk acoustic resonator and method of producing the same
TL;DR: In this article, a pit is formed in a substrate comprising a silicon wafer (51) on a surface of which a silicon oxide thin layer (53) is formed, and a sandwich structure comprising a piezoelectric layer (62) and lower and upper electrodes (61, 63) are disposed so as to stride over the pit.
Patent
Thin film piezoelectric oscillator, thin film piezoelectric device, and manufacturing method thereof
TL;DR: In this paper, a thin-film piezoelectric oscillator is constructed for a via hole and a diaphragm is placed to face the via hole, and a support area other than it.
Journal ArticleDOI
Influence of metal electrodes on crystal orientation of aluminum nitride thin films
TL;DR: In this paper, the influence of various bottom metal electrodes on the crystallinity and crystal orientation of aluminum nitride (AlN) thin films prepared on them in order to develop thin film bulk acoustic wave resonators was investigated.
Patent
Aluminum nitride thin film, composite film containing the same and piezoelectric thin film resonator using the same
TL;DR: In this paper, a piezoelectric aluminum nitride thin film resonator with a metal thin film including a layer containing ruthenium as a major component having a fullwidth half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of ruthensium of 3.0° or less.