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Modular frequency division filter

  • US 7,126,440 B2
  • Filed: 07/26/2004
  • Issued: 10/24/2006
  • Est. Priority Date: 07/26/2004
  • Status: Active Grant
First Claim
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1. A modular filter comprising:

  • an antenna port;

    N transmission paths, connecting to the anntenna port, where N≧

    2, the Nth transmission path including a duplexer, the N−

    1 transmission paths each include a filter section selected from a group comprising band pass filters, duplexers, and triplexers, wherein for each of the N−

    1 transmission paths, the filter section includes film bulk acoustic resonators, and wherein N=2, for the N−

    1 transmission path, the filter section is a duplexer, each transmission path including a frequency phase shifter, connected to the antenna port, having an output connected to the respective duplexer, and further including a frequency phase shifter serially connected to a band pass filter and the antenna port.

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