A compact interfacing device for rotating electro-magnetic fields between an input and output waveguide includes a support bar extending between opposing sides of a frame, the frame encircling an interior space divided by the support bar; and a dipole bar orientated orthogonal to the support bar. When the input waveguide interfaces an input-side of the frame and is arranged so that an extent of an input width of the input waveguide is orientated at first angle with respect to an extent of the dipole-bar length, and when the output waveguide interfaces an output-side of the frame and is arranged so that an extent of an output width of the output waveguide is orientated at a second angle with respect to the extent of the dipole-bar length, an input electric field aligned perpendicular to the extent of the input width is rotated upon propagating through the compact interfacing device.