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Filter device

  • US 20030179053A1
  • Filed: 04/17/2003
  • Published: 09/25/2003
  • Est. Priority Date: 03/23/2001
  • Status: Abandoned Application
First Claim
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1. A filter device, comprising:

  • a first filter unit including at least one series resonator and at least one shunt resonator in a ladder configuration; and

    a second filter unit connected to said first filter unit by a resonator selected from a group consisting of said at least one series resonator of said first filter unit;

    said first filter unit including an unbalanced terminal;

    said second filter unit including at least four resonators in a lattice configuration; and

    said second filter unit including two balanced terminals.

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