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R.F. Diplexing and multiplexing means

  • US 4,555,809 A
  • Filed: 10/26/1983
  • Issued: 11/26/1985
  • Est. Priority Date: 10/26/1983
  • Status: Expired due to Term
First Claim
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1. Apparatus comprising:

  • a balun having an unbalanced port with first and second terminals, said first and second terminals having a winding therebetween, a balanced port with third and fourth terminals, said third and fourth terminals having a winding therebetween, and an impedance transformation circuit coupled between the unbalanced and balanced ports for coupling signals therebetween;

    a point of reference potential;

    first unbalanced circuit means referenced to said reference potential coupled to said first terminal of said unbalanced port;

    second unbalanced circuit means referenced to said reference potential coupled to said second terminal of said unbalanced port;

    balanced circuit means coupled between said third and fourth terminals of said balanced port;

    first selection means for selectively coupling said first terminal of said unbalanced port to said point of reference potentential, thereby allowing signals to be coupled between said second terminal and said third and fourth terminals; and

    second selection means for selectively coupling said second terminal of said unbalanced port to said point of reference potential, thereby allowing signals to be coupled between said first terminal and said third and fourth terminals.

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