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Space-saving two-sided microwave circuitry for hybrid circuits

  • US 5,057,798 A
  • Filed: 06/22/1990
  • Issued: 10/15/1991
  • Est. Priority Date: 06/22/1990
  • Status: Expired due to Term
First Claim
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1. A space-saving two-sided microwave transmission line for a hybrid circuit having RF circuits and dc circuits mounted on a common substrate, comprising:

  • a substrate comprising an insulating layer having first and second substantially planar surfaces;

    a first coplanar waveguide having a first characteristic impedance and comprising a first transmission line conductor formed on said first surface of said substrate and further characterized by corresponding first planar conductive areas formed on said first surface and spaced from said first line conductor;

    a second coplanar waveguide having a second characteristic impedance equal to said first characteristic impedance and comprising a second transmission line conductor formed on said second surface of said substrate and further characterized by corresponding second planar conductive areas formed on said second surface and spaced from said second line conductor;

    a line-connecting via opening formed through said substrate and comprising means for electrically connecting said first transmission line conductor to said second transmission line conductor through said via opening; and

    matching means for substantially matching the via opening impedance to said characteristic impedances of said first and second coplanar waveguides.

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