A waveguide assembly for delivering RF energy generated by solid state electronic components into an oven, the waveguide assembly comprising: - a waveguide, - a radiation opening to provide the RF energy from the waveguide, wherein a launcher is disposed proximate to a first end of the waveguide and the radiation opening is disposed proximate to a second end of the waveguide, wherein the waveguide is defined by a back plate and a front plate extending away from the back plate, wherein the front plate is defined by a front face extending substantially parallel to the back plate, a top face extending between the front face and the back plate substantially perpendicular to both the front face and the back plate, two side faces opposing each other on opposite lateral sides of the front face extending between the front face and the back plate, and a bottom face, and wherein the bottom face is disposed at an angle relative to the front face to extend between the front face and the back plate, characterized in that the waveguide assembly includes a second waveguide adjacent the waveguide, the waveguide and the second waveguide being symmetrical with respect to each other about a longitudinal centerline of the back plate, that the front plate comprises a single unitary piece of material, and wherein the top face, two side faces and bottom face are each bent away from the front face toward the back plate to form the waveguide, and that the back plate has at least four openings formed therein, two openings being provided for each of the launchers and two openings being provided as radiation openings, wherein the radiation opening is disposed in the back plate of the waveguide assembly such that a portion of the bottom face and a portion of an interior of the front face are visible through the radiation opening, the radiation opening being offset away from an intersection of the bottom face and the back plate. - a waveguide, - a radiation opening to provide the RF energy from the waveguide, wherein a launcher is disposed proximate to a first end of the waveguide and the radiation opening is disposed proximate to a second end of the waveguide, wherein the waveguide is defined by a back plate and a front plate extending away from the back plate, wherein the front plate is defined by a front face extending substantially parallel to the back plate, a top face extending between the front face and the back plate substantially perpendicular to both the front face and the back plate, two side faces opposing each other on opposite lateral sides of the front face extending between the front face and the back plate, and a bottom face, and wherein the bottom face is disposed at an angle relative to the front face to extend between the front face and the back plate, characterized in that the waveguide assembly includes a second waveguide adjacent the waveguide, the waveguide and the second waveguide being symmetrical with respect to each other about a longitudinal centerline of the back plate, that the front plate comprises a single unitary piece of material, and wherein the top face, two side faces and bottom face are each bent away from the front face toward the back plate to form the waveguide, and that the back plate has at least four openings formed therein, two openings being provided for each of the launchers and two openings being provided as radiation openings, wherein the radiation opening is disposed in the back plate of the waveguide assembly such that a portion of the bottom face and a portion of an interior of the front face are visible through the radiation opening, the radiation opening being offset away from an intersection of the bottom face and the back plate.