According to one embodiment of the invention, a planar transmission line transition system includes a coplanar waveguide transmission line that includes a first electrical path and a second electrical path. The planar transmission line transition system also includes a transmission line stub electrically connected in series to the first electrical path of the coplanar waveguide transmission line, wherein a signal output at a first connection of the transmission line stub is phase delayed approximately 180 degrees with respect to a signal input at a second connection of the transmission line stub. The planar transmission line transition system further includes a transmission line electrically connected to the second electrical path of the coplanar waveguide transmission line and the first connection of the transmission line stub.