Surface acoustic wave filter bank having trap function

Surface acoustic wave filter bank having trap function

  • CN 101,674,063 A
  • Filed: 09/10/2008
  • Published: 03/17/2010
  • Est. Priority Date: 09/10/2008
  • Status: Active Application
First Claim
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1. the Surface Acoustic Wave Filter group with trap function comprises by one group of wideband acoustic surface-wave filter, a gating circuit (1) and two group of one one-level Surface Acoustic Wave Filter group that the cutter multithrow switch constitutes;

  • Wherein said first group of one cutter multithrow switch (3) is electrically connected with the input of described one group of wideband acoustic surface-wave filter, second group of one cutter multithrow switch (3 '"'"') is electrically connected with the output of described one group of wideband acoustic surface-wave filter, and two group of one cutter multithrow switch is corresponding one by one;

    Described gating circuit is electrically connected with first group of one cutter multithrow switch (3) and second group of one cutter multithrow switch (3 '"'"') respectively, by two group of one cutter multithrow switch of gating circuit (1) control, the input and the output of a wideband acoustic surface-wave filter of while gating, a passage of formation bank of filters;

    It is characterized in that, at the input of described one-level Surface Acoustic Wave Filter group or output at least one surface acoustic wave trapper (4) of connecting;

    Described surface acoustic wave trapper (4) is that two one-port saw resonators that make up on piezoelectric substrate and external inductance connect to form by П

    shape circuit, and wherein two one-port saw resonators lay respectively on two parallel arms of П

    shape circuit.

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