The invention discloses a plane
balun with filter and power dividing characteristics. The plane
balun comprises a substrate integrated
waveguide, a substrate integrated
waveguide inductive window and a
metal sticker, the substrate integrated
waveguide inductive window is positioned in the substrate integrated waveguide, the
metal sticker comprises an upper surface
metal sticker and a lower surface metal sticker, the upper surface metal sticker, an input end, a first output end and an upper slot line are arranged on the upper surface of a
dielectric substrate, and the lower surface metal sticker, a second output end and a lower slot line are arranged on the lower surface of the
dielectric substrate. Compared with the prior art, a substrate integrated
waveguide filter, a substrate integrated waveguide power divider and a substrate integrated waveguide
balun are organically integrated together to form a substrate integrated
waveguide filter and power dividing balun with excellent
frequency selection characteristics and
energy distribution characteristics. The whole balun is implemented by the aid of a traditional PCB (
printed circuit board) process, integration is facilitated in a
microwave and
millimeter wave circuit, and the balun is simple in structure and easy to design.