New and simple method for the direct measurement of microwave power radiated from gasketed seams

Summary form only given. Gasketed seams are currently characterized by the surface transfer impedance which relates applied excitation current density, J, on the input side of the gasketed seam to the open circuit voltage, VOC, on the output side. But this method gives no information on the power radiated into the output region. With the new method, VOC is measured directly with a simple hand-field voltage probe comprising a small-diameter semi-rigid coaxial cable that has the center conductor protruding about one-eighth of an inch beyond the solid metal shield. The probe is moved along the gasketed seam while contacting one side with the center conductor, and the other side with the shield. The average value of the square of VOC along the seam is related to the average power, PC, transmitted by the probe cable to a sensitive power meter. The total radiated power, PR, is then determined using the radiation conductance of the seam, as given by the authors' Eq. (7) on page 393 of the August 1995 EMC Symposium Digest (Atlanta).