M.E.C.’s precisely machined quad-ridge to double-ridge transitions allow the connection of quad-ridge waveguide to double-ridge waveguide with low insertion loss and good match. In the overlapping frequency band common to both waveguides, VSWR is 1.06:1 max.
Material is aluminum. Finish is chromate conversion per MIL-C-5541, Class 3, and paint is gray epoxy enamel.
Currently, M.E.C. has components for the two most popular frequency bands, Q650-D28 covering 7.5 to 18 GHz and Q250-D30 covering 2.5 to 7.5 GHz. These units roughly parallel the double-ridge waveguide bands for WRD650 and WRD250.
Quad-ridge transmission lines combine the broad frequency band of double-ridge waveguide with the ability to transmit two independent, orthogonally polarized waveguide modes. These modes can be used alone or in any combination of amplitude and phase. This property is useful for many antenna applications. For example, it permits polarization diversity and more efficient use of the frequency spectrum by using left and right circular polarizations.