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    • 3. 发明申请
    • RESONATOR FILTER STRUCTURE HAVING EQUAL RESONANCE FREQUENCIES
    • 具有均匀共振频率的谐振滤波器结构
    • WO2004066490A3
    • 2004-12-02
    • PCT/IB0306368
    • 2003-12-22
    • KONINKL PHILIPS ELECTRONICS NVTEN DOLLE HENDRIK K JLOEBL HANS P
    • TEN DOLLE HENDRIK K JLOEBL HANS P
    • H03H9/00H03H9/58H03H9/64
    • H03H9/0095H03H9/0028H03H9/009
    • The invention relates to a resonator filter structure (10) for radio frequency (RF) filters, especially a bulk acoustic wave (BAW) filter structure. According to the invention, a resonator filter structure (10) is constructed with a BAW lattice filter section (20), in which all of the BAW resonator elements (20-1, 20-2, 20-3, 20-4) within the BAW lattice filter section (20) have substantially equal resonance frequencies. According to the invention, there are parallel capacitances (30-1, 30-2) connected in parallel to the BAW resonators (20-2, 20-3) of one branch type of the BAW lattice filter section (20). Thus, anti-resonance frequency of the respective BAW resonator (20-2, 20-3) is tuned. That results in a very narrow passband which corresponds approximately to the difference in anti-resonance frequencies between diagonal and horizontal branches of the lattice filter section (20). The parallel capacitances (30-1, 30-2) are used to tune the bandwidth: the smaller the capacitance, the smaller the bandwidth. Moreover, due to the lattice structure at one port of the resonator filter signal guidance will be balanced while at the other port signal guidance can be unbalanced or balanced according to the application needs.
    • 本发明涉及一种用于射频(RF)滤波器,特别是体声波(BAW)滤波器结构的谐振器滤波器结构(10)。 根据本发明,谐振器滤波器结构(10)由BAW晶格滤波器部分(20)构成,其中所有BAW谐振器元件(20-1,20-2,20-3,20-4)内部 BAW晶格滤波器部分(20)具有基本相等的共振频率。 根据本发明,存在与BAW晶格滤波器部分(20)的一个分支类型的BAW谐振器(20-2,20-3)并联连接的并联电容(30-1,30-2)。 因此,调谐各个BAW谐振器(20-2,20-3)的反共振频率。 这导致非常窄的通带,其大致对应于格子滤波器部分(20)的对角线和水平分支之间的反共振频率的差异。 并联电容(30-1,30-2)用于调整带宽:电容越小,带宽越小。 此外,由于谐振器滤波器的一个端口处的晶格结构信号引导将被平衡,而在另一端口处,信号引导可以根据应用需要不平衡或平衡。