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Printed circuit transformer

  • US 5,003,622 A
  • Filed: 09/26/1989
  • Issued: 03/26/1991
  • Est. Priority Date: 09/26/1989
  • Status: Expired due to Fees
First Claim
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1. A printed circuit comprising:

  • a substrate including a planar portion of insulating material;

    at least one conductive planar region disposed on said substrate to provide a ground plane; and

    a balun transformer including a pair of first and second coextensive elongated conductors disposed on said planar portion to form a strip transmission line having first and second end portions, said second conductor having a connection to said ground plane at said first end portion of said strip transmission line, and said first conductor having a connection to said ground plane at said second end portion of said strip transmission line, whereby a balanced signal is provided from said first conductor at said first end portion and said second conductor at said second end portion,said transformer including a third elongated conductor disposed on said planar portion and coextensive with said first and second conductors to form a primary winding of said balun transformer,said strip transmission line being disposed in a loop and forming a grounded center-tapped secondary winding of said balun transformer.

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