RF filter
    2.
    发明授权

    公开(公告)号:US11095268B2

    公开(公告)日:2021-08-17

    申请号:US15316145

    申请日:2015-08-11

    申请人: Snaptrack Inc.

    摘要: An RF filter is disclosed. In an embodiment, the RF filter includes series-interconnected basic elements, each basic element having an electroacoustic resonator and impedance converters interconnected in series between the basic elements, wherein the impedance converters are impedance inverters and/or admittance inverters, and wherein the resonators of the basic elements are either only series resonators or only parallel resonators.

    Electroacoustic transducer with improved suppression of unwanted modes

    公开(公告)号:US10574207B2

    公开(公告)日:2020-02-25

    申请号:US15531299

    申请日:2014-12-16

    申请人: SNAPTRACK, INC.

    IPC分类号: H03H9/02 H03H9/145

    摘要: An improved electroacoustic transducer with an improved mode profile is provided. The transducer comprises a transversal velocity profile with a periodic structure and an edge structure flanking the periodic structure. The velocity profile also allows to suppress the SH wave mode. A dielectric material with a periodic structure contributes to the formation of the periodic structure of the velocity profile.

    MULTILAYER INTERCONNECTION SUBSTRATE FOR HIGH FREQUENCY AND MANUFACTURING METHOD THEREOF

    公开(公告)号:US20190089044A1

    公开(公告)日:2019-03-21

    申请号:US16086333

    申请日:2017-03-31

    申请人: SNAPTRACK, INC.

    摘要: [Problem] To realize high reliability and high functionalization while suppressing characteristics variation in a multilayer interconnection substrate used in a microwave or millimeter-wave band integrated with an antenna. [Resolution Means] A multilayer substrate for high frequency with an antenna element formed on a surface. The multilayer substrate for high frequency has an intermediate substrate. The intermediate substrate consists of a low-temperature co-fired glass-ceramic substrate and has intermediate insulating layers consisting of a glass-ceramic and an internal conductor formed between these intermediate insulating layers. A surface insulating layer consisting of an organic material having a dielectric constant lower than a glass-ceramic material is stacked on a surface of the intermediate substrate. An outer-side via conductor penetrating this surface insulating layer is configured by a sintered metal that forms a metallic bond with a wiring conductor in the substrate. The outer-side via conductor is formed at the same time as sintering the glass-ceramic multilayer substrate.