逆方向のc軸圧電素子を備えた音響結合変成器

Japanese Patent JP4754803

B2

Embodiments of an acoustically-coupled transformer have a first stacked bulk acoustic resonator (SBAR) (106) and a second SBAR (108). Each of the SBARs has a lower film bulk acoustic resonator (FBAR) and an upper FBAR, and an acoustic decoupler between the FBARs. The upper FBAR is stacked atop the lower FBAR. Each FBAR has opposed planar electrodes and a piezoelectric element between the electrodes. The piezoelectric element is characterized by a c-axis. The c-axes of the piezoelectric elements of the lower FBARs are opposite in direction, and the c-axes of the piezoelectric elements of the upper FBARs are opposite in direction. The transformer additionally has a first electrical circuit connecting the lower FBAR of the first SBAR to the lower FBAR of the second SBAR, and a second electrical circuit connecting the upper FBAR of the first SBAR to the upper FBARs of the second SBAR.

John Di Larson Third
Yury Oshmyansky

JP2004312852A

August 24, 2011

October 27, 2004

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Avago Technologies Wireless IP (Singapore) Private Limited

H01L41/09; H03H9/02; H01L41/08; H01L41/18; H01L41/22; H01L41/257; H01L41/319; H03H3/02; H03H9/13; H03H9/17; H03H9/60

JP52013794A
JP60126907A
JP60070814A
JP2001285015A
JP2005136991A

US20030128081
WO2003050950A1

K.M.Lakin,Bulk Acoustic Wave Coupled Resonator Filters,2002 IEEE International Frequency Control Symposium and PDA Exhibition,2002年,p.8-p.14

Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo
Hidefumi Kawamura
Naomi Yoshida
Ayako Nakamura
Masayuki Okamoto
Fukagawa Eri
Satoshi Morimoto
Patent business corporation ofh patent office
Satoshi Furuya
Takahiko Mizobe
Kiyoharu Nishiyama

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