MORONI RTP SLOT An essential feature of directional couplers is that they only couple power flowing in one direction. The design can be realised in planar format but it has a more natural implementation in coax - in planar, the two lines have to be kept apart so that they do not couple but have to be brought together at their outputs so they can be terminated whereas in coax the lines can be run side-by-side relying on the coax outer conductors for screening. Lossless multiplexing can only be done with filter networks. This is the decoupled port. The hybrid ring is not symmetric on its ports; choosing a different port as the input does not necessarily produce the same results.|While others will Surely Follow Suit