Overlay Line Coupler.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent application relates to a 90 degree directional coupler and a method of manufacturing therefor wherein the coupler is constructed on a planar microcircuit. The four 90 degree coupler ports are formed on one surface of a dielectric laminate having a metallic ground plane on the other surface thereof. Two diagonally opposite positioned ports are interconnected by a first coupling line formed on the surface of the substrate. A thin dielectric layer is then placed over the first coupling line and a second coupling line is placed over the thin dielectric layer such that it is substantially parallel to the first coupling line and such that it interconnects the other two diagonally opposite ports.
- Electrical and Electronic Equipment