Abstract: A microwave leakage shielding apparatus of microwave oven which can cut off the leakage of high-frequency electromagnetic wave as well as that of second harmonic. The slot antenna is installed in such a manner that a serial resonant circuit is provided within the attenuating cavity of the choke installed in the door of microwave oven. Also, the apparatus can reduce the thickness of door by performing the one-quarter impedance inversion in the nearer position then .lambda./4 through the serial resonant circuit, thereby enlarging the capacity of heating room.

Abstract: A device for preventing twist of a connecting line for a temperature probe in a microwave range. An electromagnet which is automatically actuated according to a connecting rod being inserted into a jack is provided so that a steel piece of an activating lever is attracted thereto to result in a stopping pin of the activating lever being outwardly extruded from a fixing plate through an opening. A disk having a protrusion at its peripheral surface is mounted on a rotating axis of a synchronous motor in such a manner that the disk is repeatedly rotated, invertedly in its direction every time the protrusion is contacted with the stopping pin.