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Acoustic Filter

  • US 20190089324A1
  • Filed: 09/21/2017
  • Published: 03/21/2019
  • Est. Priority Date: 09/21/2017
  • Status: Active Grant
First Claim
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1. A surface acoustic wave (SAW) filter comprising:

  • a piezoelectric material;

    a first group of inter-digital transducers (IDTs) on the piezoelectric material, the first group of IDTs configured to;

    transform a first set of electrical signals into a first set of acoustic signals for propagation via a first portion of the piezoelectric material;

    select a first set of selected acoustic signals of the first set of acoustic signals within a specified passband; and

    convert the first set of selected acoustic signals into a first set of filtered electrical signals;

    a second group of IDTs on the piezoelectric material, the second group of IDTs configured to;

    transform a second set of electrical signals into a second set of acoustic signals for propagation via a second portion of the piezoelectric material;

    select a second set of selected acoustic signals of the second set of acoustic signals within the specified passband; and

    convert the second set of selected acoustic signals into a second set of filtered electrical signals; and

    a partial-IDT on the piezoelectric material and positioned between the first group of IDTs and the second group of IDTs, the partial-IDT including;

    a first bus bar and a second bus bar, the first bus bar and the second bus bar uncoupled from ground such that the partial-IDT is electrically floating;

    a first side configured to facilitate a cavity transition between the partial-IDT and the first group of IDTs, the cavity transition facilitating propagation of the first set of acoustic signals within, or between elements of, the partial-IDT; and

    a second side configured to facilitate a reflector transition between the partial-IDT and the second group of IDTs, the reflector transition configured to reduce propagation of the second set of acoustic signals within, or between elements of, the partial-IDT.

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