Substrate integrated waveguide transition including an impedance transformer having an open portion with long sides thereof parallel to a centerline

A system comprising:

• a waveguide;
• a substrate integrated waveguide (SIW) transition coupled to the waveguide, wherein the SIW transition comprises:
• a dielectric substrate having a top surface and a bottom surface;
• a first metallic layer portion coupled to the top surface of the dielectric substrate, wherein the first metallic layer portion comprises:
• a single-ended termination, and
• an impedance transformer positioned between the single-ended termination and an open portion in the first metallic layer portion, wherein the impedance transformer tapers from a first end positioned proximate the single-ended termination to a second end positioned proximate the open portion, and wherein the open portion has a rectangular configuration with long sides thereof aligned in parallel to a centerline that extends between the single-ended termination and the impedance transformer;
• a second metallic layer portion coupled to the bottom surface of the dielectric substrate;
• and
• a set of metallic via-holes electrically coupling the first metallic layer portion to the second metallic layer portion.

A method comprising:

• conducting electromagnetic energy via a transmission line on a printed circuit board (PCB);
• coupling the electromagnetic energy into a waveguide via an SIW transition, wherein the SIW transition comprises:
• a dielectric substrate having a top surface and a bottom surface;
• a first metallic layer portion coupled to the top surface of the dielectric substrate, wherein the first metallic layer portion comprises:
• a single-ended termination, and
• an impedance transformer positioned between the single-ended termination and an open portion in the first metallic layer portion, wherein the impedance transformer tapers from a first end positioned proximate the single-ended termination to a second end positioned proximate the open portion, and wherein the open portion has a rectangular configuration with long sides thereof aligned in parallel to a centerline that extends between the single-ended termination and the impedance transformer;
• a second metallic layer portion coupled to the bottom surface of the dielectric substrate;
• and
• a set of metallic via-holes electrically coupling the first metallic layer portion to the second metallic layer portion;
• and
• transmitting the electromagnetic energy as signals via one or more antennas coupled to the waveguide.