A six port waveguide junction which can be used for combining power from four reflection amplifiers is disclosed. One port (50) acts as the input/output and four symmetrically disposed ports (10, 20, 30, 40) are adapted for coupling to respective reflection amplifiers. A sixth port (60) is terminated and provides a ballasting effect to the interaction of the amplifiers. The structure associated with the four symmetrically disposed ports resemble two rectangular waveguides in cross intersection so as to make a 4-way H-plane junction. The rectangular input/output port is located on the axis of the cross formed by the four arms and is rotated 45 degrees so that it couples equally to the four arms. The rectangular sixth port is on the same axis as the input/output port but on the opposite side of the junction and is rotated by 90 degrees with respect to the input/output with which it is thus cross-coupled.
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