WAVEGUIDE STRUCTURE, WAVEGUIDE AND ELECTROMAGNETIC RADIATION COUPLING METHOD

PROBLEM TO BE SOLVED: To provide a new transitional part from a waveguide to a coaxial connecting part. SOLUTION: A transitional part from a waveguide 26 to a coaxial connecting part 48 is provided by this waveguide structural body. The coaxial connecting part is provided with an outer conductor 50 electrically connected with a top part ground plate 36 and an inner conductor 52 extended to the polymer materials in the waveguide. The inner conductor is electrically connected with a capacitive plate 56, and the capacitative plate is electrically connected with a conductive probe 58, and the probe is electrically connected with a conductive post 60, and the post is electrically connected with a bottom part ground plate 38. The probe is extended to the crossing direction of the propagating direction of electromagnetic waves so that electromagnetic energy can be extracted. A branched capacitance resonating with inductance generated from the probe and the inner conductor is provided by the capacitive plate. The probe is separated from a back short surface 44 only by a distance shorter than 1/4 wavelength of electromagnetic radiation. The positions and dimensions of the probe, capacitive plate, inner conductor, and post are optimized so that the electromagnetic radiation has an impedance suitable for the coaxial connecting part 48.