摘要:
A film bulk acoustic resonator includes a substrate (101); a lower electrode (110) formed on top of the substrate (101); a piezoelectric membrane (113) formed on top of the lower electrode (110) and having a crystallographic axis (CC) so inclined as to generate a total reflection when an acoustic wave advances toward the lower electrode (110); and an upper electrode (115) formed on top of the piezoelectric membrane (113). The circumference of the piezoelectric membrane (113) may comprise an enveloping wall (117) which may be patterned on the same layer as that of forming the upper electrode (115).
摘要:
An integrated filter including a film bulk acoustic resonator (FBAR) and a surface acoustic wave (SAW) resonator and a method of fabricating the integrated filter. The integrated filter includes: a substrate (110); a first electrode (120) positioned in a predetermined first area on an upper surface of the substrate; a first piezoelectric layer (130) positioned on the first electrode; a second electrode (150) positioned on the first piezoelectric layer; a second piezoelectric layer (140) positioned in a predetermined second area on the upper surface of the substrate; and at least one inter-digital transducer (IDT) electrode (160,170) positioned on the second piezoelectric layer. The IDT electrode includes: a first IDT electrode (160) formed in a comb structure on the second piezoelectric layer; and a second IDT electrode (170) formed in a comb structure on the second piezoelectric layer so as to mesh with the first IDT electrode. The first and second piezoelectric layers are formed of an identical material. Thus, an integrated filter which operates in various frequency bands can be made compact.
摘要:
A film bulk acoustic resonator includes a substrate (101); a lower electrode (110) formed on top of the substrate (101); a piezoelectric membrane (113) formed on top of the lower electrode (110) and having a crystallographic axis (CC) so inclined as to generate a total reflection when an acoustic wave advances toward the lower electrode (110); and an upper electrode (115) formed on top of the piezoelectric membrane (113). The circumference of the piezoelectric membrane (113) may comprise an enveloping wall (117) which may be patterned on the same layer as that of forming the upper electrode (115).
摘要:
A monolithic duplexer and a fabrication method thereof. The monolithic duplexer includes a device wafer (10), a plurality of elements (1a,1b,1c,1d) distanced from each other on a top portion of a device wafer, first sealing parts (30) formed on the top portion of the device wafer, and a plurality of first ground planes (20) formed between the plurality of elements. A cap wafer (40) is also provided having an etched area for packaging the device wafer, a plurality of protrusion parts, a plurality of ground posts (42), and cavities. Second sealing parts (48) are formed on a bottom portion of the protrusion parts, and a plurality of second ground planes (46) cover the plurality of ground posts. Via holes (50) vertically penetrate the cap wafer to connect to the plurality of the second ground planes, and ground terminals (60) are formed on top portions of the via holes. The first sealing parts and the first ground planes are attached to the second sealing parts and the second ground planes, respectively.
摘要:
A monolithic duplexer and a fabrication method thereof. The monolithic duplexer includes a device wafer (10), a plurality of elements (1a,1b,1c,1d) distanced from each other on a top portion of a device wafer, first sealing parts (30) formed on the top portion of the device wafer, and a plurality of first ground planes (20) formed between the plurality of elements. A cap wafer (40) is also provided having an etched area for packaging the device wafer, a plurality of protrusion parts, a plurality of ground posts (42), and cavities. Second sealing parts (48) are formed on a bottom portion of the protrusion parts, and a plurality of second ground planes (46) cover the plurality of ground posts. Via holes (50) vertically penetrate the cap wafer to connect to the plurality of the second ground planes, and ground terminals (60) are formed on top portions of the via holes. The first sealing parts and the first ground planes are attached to the second sealing parts and the second ground planes, respectively.
摘要:
An integrated filter including a film bulk acoustic resonator (FBAR) and a surface acoustic wave (SAW) resonator and a method of fabricating the integrated filter. The integrated filter includes: a substrate; a first electrode positioned in a predetermined first area on an upper surface of the substrate; a first piezoelectric layer positioned on the first electrode; a second electrode positioned on the first piezoelectric layer; a second piezoelectric layer positioned in a predetermined second area on the upper surface of the substrate; and at least one inter-digital transducer (IDT) electrode positioned on the second piezoelectric layer. The IDT electrode includes: a first IDT electrode formed in a comb structure on the second piezoelectric layer; and a second IDT electrode formed in a comb structure on the second piezoelectric layer so as to mesh with the first IDT electrode. The first and second piezoelectric layers are formed of an identical material. Thus, an integrated filter which operates in various frequency bands can be made compact.