port 4 1 or the first feeding port 1 l but not with the third feeding port 3 1 communication between circuit layers is permitted through the coupling aperture for instance electromagnetic communication between the second feeding port 2 1 and the first feeding port 1 1 could begin with the second feeding port 2 1 providing a signal to the second planar transmission line 2 2 which would send a signal through the coupling aperture 9 into the first planar waveguide 1 2 and into the first feeding port 1 1 various performances of the one planar waveguide and three planar transmission line configuration of fig1 a are illustrated in fig1 b feeding port measurements were performed for several feeding port combinations these performances were measured over the range from 11 2 to 13 4 gigahertz ghz fig1 b is a graph illustrative of test results showing scattering parameter magnitude s in decibels db plotted against frequency f in ghz for the waveguide configuration of fig1 a the test results for fig1 b are approximate and even more accurate results are expected with more precise calibration fig2 a depicts a second variation of the present invention where the waveguide arrangement consists of four planar transmission lines the reader 39 s attention is now directed to fig2 a which is a perspective view of a multiplanar magic t junction with four planar transmission lines this arrangement consists of a first feeding port 11 1 a first planar transmission line 11 2 a second feeding port 12 1 a second planar transmission line 12 2 a third feeding port 13 1 a third planar transmission.