M
Masafumi Iwaki
Researcher at Fujitsu
Publications - 50
Citations - 904
Masafumi Iwaki is an academic researcher from Fujitsu. The author has contributed to research in topics: Resonator & Electrode. The author has an hindex of 18, co-authored 50 publications receiving 854 citations. Previous affiliations of Masafumi Iwaki include Taiyo Yuden.
Papers
More filters
Patent
Piezoelectric thin-film resonator and filter using the same
Masafumi Iwaki,Jun Tsutsumi,Tokihiro Nishihara,Tsuyoshi Yokoyama,Takeshi Sakashita,Shinji Taniguchi,Masanori Ueda,Go Endo +7 more
Proceedings ArticleDOI
New electrode material for low-loss and high-Q FBAR filters
Tsuyoshi Yokoyama,T. Nishihara,Shinji Taniguchi,Masafumi Iwaki,Y. Satoh,M. Ueda,Tsutomu Miyashita +6 more
TL;DR: In this article, the authors investigated the influence of electrode materials on the resonant characteristics of FBAR in FEM simulations and experiments and found the properties of ruthenium (Ru) to be suitable for use as electrode materials for AlN-based FBARs.
Patent
Filter and duplexer
Tokihiro Nishihara,Shinji Taniguchi,Masafumi Iwaki,Tsuyoshi Yokoyama,Takeshi Sakashita,Masanori Ueda,Yasuyuki Saitou +6 more
TL;DR: In this article, a filter includes one or a plurality of parallel resonators coupled in parallel and one or plurality of a film bulk acoustic resonator coupled in series, the substrate having a substrate, a lower electrode, a piezoelectric membrane, and an upper electrode, where at least one of the lower electrode and the upper electrode has a thick membrane region having a thickness larger than that of a center portion of a resonance region at an edge of the resonance region.
Patent
Duplexer and ladder type filter
Tokihiro Nishihara,Shogo Inoue,Takashi Matsuda,Masanori Ueda,Masafumi Iwaki,Shinji Taniguchi,Go Endo +6 more
TL;DR: In this paper, a duplexer includes an antenna terminal, a first filter connected to the antenna terminal and a second filter connected at the same time to the duplex terminal.
Patent
Piezoelectric thin0film resonator, filter using the same, and duplexer using the same
Tokihiro Nishihara,Motoaki Hara,Shinji Taniguchi,Takeshi Sakashita,Takeshi Yokoyama,Masafumi Iwaki,Masanori Ueda +6 more
TL;DR: In this article, a piezoelectric thin-film resonator is defined as a resonator with a substrate, a lower electrode formed on the substrate and an upper electrode created by the lower electrode and the upper electrode opposing each other through the substrate to form an opposing region, the opposing region including a space at a boundary of the opposing regions.