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Multiplexer for cellular telephone

  • US 6,396,365 B1
  • Filed: 03/20/2000
  • Issued: 05/28/2002
  • Est. Priority Date: 07/16/1963
  • Status: Expired due to Term
First Claim
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1. A multiplexer circuit comprising:

  • a first connection terminal for connection to a first antenna arranged for transmitting and receiving signals in a first cellular frequency range;

    a second connection terminal for connection to a second antenna arranged for transmitting and receiving signals in a second cellular frequency range, discrete from and higher than said first cellular frequency range; and

    a third connection terminal for connection to a cellular telephone adapted to receive both first and second cellular frequency ranges;

    said multiplexer circuit further comprising a first single receiving and transmitting filter circuit connected between said first connection terminal and said third connection terminal for excluding signals outside of said first cellular frequency range and a second single receiving and transmitting filter circuit connected between said second connection terminal and said third connection terminal for excluding signals outside said second cellular frequency range.

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