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Microstrip to ridge waveguide transition

  • US 5,095,292 A
  • Filed: 08/24/1990
  • Issued: 03/10/1992
  • Est. Priority Date: 08/24/1990
  • Status: Expired due to Term
First Claim
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1. A microstrip transmission line to double ridge waveguide transition circuit, wherein the double ridge waveguide is characterized by an open end and by longitudinally extending ridge elements extending from respective long side walls of the waveguide into the waveguide interior, comprising:

  • a microstrip circuit, comprising a planar dielectric substrate having a circuit side and a ground plane side, the circuit side being selectively patterned with a conductive layer to define a balun network and a conductor line, the ground plane side being selectively patterned with a conductive layer to define a dipole immediately beneath the balun network and a ground plane surface area; and

    and wherein the microstrip circuit is substantially centered on the longitudinal sides of the waveguide adjacent said open end such that a gap exists between the dipole and the waveguide open end, the size of the gap selected for optimum VSWR.

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