摘要:
A subminiature, high-performance monolithic duplexer is disclosed. The monolithic duplexer includes a substrate (100), a transmitting-end filter (300) formed in a first area on an upper surface of the substrate, a receiving-end filter (400) formed in a second area on the upper surface of the substrate, a packaging substrate (200), bonded on an area on the upper surface of the substrate, for packaging the transmitting-end filter and the receiving-end filter in a sealed state, and a phase shifter (210), formed on one surface of the packaging substrate and connected to the transmitting-end filter and the receiving-end filter, respectively, for intercepting a signal inflow between the transmitting-end filter and the receiving-end filter.
摘要:
An air-gap type thin film bulk acoustic resonator (FBAR) and method for fabricating the same. Also disclosed are a filter and a duplexer employing the air-gap type FBAR. The air-gap type FBAR includes: a first substrate (200) having a cavity part (210) at a predetermined region on its upper surface; a dielectric film stacked on the upper part of the first substrate; a first air gap formed between the first substrate and the dielectric film (220); a stacked resonance part (230) including a lower electrode/piezoelectric layer/upper electrode formed on the upper part of the dielectric film; a second substrate (240) having a cavity part at a predetermined region on its lower surface and joined to the first substrate; and a second air gap (250) formed between the stacked resonance part and the second substrate. A thin film of predetermined thickness made of a liquid crystal polymer (LCP) may be used as the dielectric film.
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 method of manufacturing a MEMS structure including forming a porous layer having a predetermined thickness on the top surface of a substrate over an area where a cavity is to be formed; forming the cavity by etching the substrate below the porous layer; forming a membrane layer on the top surface to seal the cavity; and forming a structure on the upper side of the membrane layer. After forming a cantilever structure on the membrane layer and etching the membrane layer, a cantilever structure is produced in a floating state over the cavity. Also, at least one inlet hole and outlet hole can be formed in the porous layer and the membrane, thereby providing a sealed fluidic channel.
摘要:
A resonator having a membrane formed of a piezoelectric layer sandwiched between first and second electrode is suspended above a cavity formed from the back surface of the support structure. In one embodiment, the cavity walls are substantially perpendicular to the back surface. In another embodiment, the first electrode is formed in the cavity such that it is electrically connected to an electrode on the back surface of the support structure. In yet another embodiment, the cavity is formed via an etch through via holes in the back surface of the support structure, which leads to greater flexibility in designing a method of manufacture while reducing the need for alignment relative to other designs.
摘要:
A subminiature, high-performance monolithic duplexer is disclosed. The monolithic duplexer includes a substrate (100), a transmitting-end filter (300) formed in a first area on an upper surface of the substrate, a receiving-end filter (400) formed in a second area on the upper surface of the substrate, a packaging substrate (200), bonded on an area on the upper surface of the substrate, for packaging the transmitting-end filter and the receiving-end filter in a sealed state, and a phase shifter (210), formed on one surface of the packaging substrate and connected to the transmitting-end filter and the receiving-end filter, respectively, for intercepting a signal inflow between the transmitting-end filter and the receiving-end filter.
摘要:
A filter formed of film bulk acoustic resonators (40,42,44,48,54,56,60) has a topology that enables a trimming inductor (58) to be fabricated on the same substrate as the resonator arrays. The entire filter can be fabricated on a single chip, utilizing only integrated circuit processes. In an exemplary embodiment, a pair of shunt resonators (54,56) each have one electrode connected to series-connected resonators. The other electrodes of the two shunt resonators are connected in common to one another. The trimming inductor (58) is connected between the common electrode and ground potential. A third shunt resonator (60) is connected between the series-connected resonators and ground potential.